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Universal Display Corporation

Universal Display Corporation (OLED)

Closed July 22 4:00PM
( -0.62% )
Pre Market: 4:16AM

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Key stats and details

Current Price
0.00 Day's Range 0.00
133.67 52 Week Range 237.00
Market Cap
Previous Close
Last Trade
Last Trade Time
Financial Volume
Average Volume (3m)
Shares Outstanding
Dividend Yield
PE Ratio
Earnings Per Share (EPS)
Net Profit

About Universal Display Corporation

Universal Display Corp researches, develops, and manufactures organic light-emitting diode, or OLED, technologies for use in displays for mobile phones, tablets, televisions, wearables, personal computers, automotive interiors, and the solid-state lighting market. OLED technologies are an alternativ... Universal Display Corp researches, develops, and manufactures organic light-emitting diode, or OLED, technologies for use in displays for mobile phones, tablets, televisions, wearables, personal computers, automotive interiors, and the solid-state lighting market. OLED technologies are an alternative to light-emitting diode, or LED, technologies, in the solid-state lighting market, and liquid crystal displays in the flat-panel-display market. A large majority of the firm's revenue is generated in South Korea, with the rest coming from Japan, China, the United States, and other countries across the world. Show more

Electronic Comp, Accessories
Computer Terminals
Philadelphia, Pennsylvania, USA
Universal Display Corporation is listed in the Electronic Comp, Accessories sector of the NASDAQ with ticker OLED. The last closing price for Universal Display was $224.92. Over the last year, Universal Display shares have traded in a share price range of $ 133.67 to $ 237.00.

Universal Display currently has 47,439,488 shares outstanding. The market capitalization of Universal Display is $10.67 billion. Universal Display has a price to earnings ratio (PE ratio) of 52.56.

Universal Display (OLED) Options Flow Summary

Overall Flow


Net Premium


Calls / Puts


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Sweeps Ratio


OLED Latest News

Universal Display Corporation Announces Second Quarter 2024 Conference Call

Universal Display Corporation (Nasdaq: OLED) (UDC), enabling energy-efficient displays and lighting with its UniversalPHOLED® technology and materials, today announced its results for the second...

Universal Display Corporation Holds Virtual 2024 Annual Meeting of Shareholders

Universal Display Corporation (Nasdaq: OLED) (UDC), enabling energy-efficient displays and lighting with its UniversalPHOLED® technology and materials, today held its Virtual 2024 Annual Meeting...

Universal Display Corporation to Commemorate 30th Anniversary by Ringing Nasdaq Closing Bell

Universal Display Corporation (Nasdaq: OLED) (UDC), enabling energy-efficient displays and lighting with its UniversalPHOLED® technology and materials, announced that Steven V. Abramson...

Universal Display Corporation to Hold Virtual 2024 Annual Meeting of Shareholders

Universal Display Corporation (Nasdaq: OLED) (UDC), enabling energy-efficient displays and lighting with its UniversalPHOLED® technology and materials, will hold its 2024 Annual Meeting of...

Universal Display Corporation Announces Participation at Upcoming Conferences

Universal Display Corporation (Nasdaq: OLED), enabling energy-efficient displays and lighting with its UniversalPHOLED® technology and materials, today announced its participation in the...

Universal Display Corporation to Exhibit and Present at SID Display Week 2024

Universal Display Corporation (Nasdaq: OLED) (UDC), enabling energy-efficient displays and lighting with its UniversalPHOLED® technology and materials, today announced that the Company will...

PeriodChangeChange %OpenHighLowAvg. Daily VolVWAP


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OLED Discussion

View Posts
SilkRoad SilkRoad 2 days ago
I invested in the original company that was the best pure publicly traded OLED and got bought out by a Japanese conglomerate which paid $12 cash for each share which was then worth $6. I never thought much of Universal Display at the time and kind of laughed when they took over the ticker. I never invested. And now I see what they have done over the last decade plus and I definitely missed this one. Congrats to those that got in early and believed. You’ve done well for yourselves.

A day I would like to forget:
Monksdream Monksdream 2 weeks ago
OLED new 52/week high
fung_derf fung_derf 1 year ago
What's up here? Not seeing any news yet. Making a nice move up
bigbut bigbut 3 years ago
Dead board
Hot stock
Ride it up
Just broke 5: been in since 3’s, riding to 7.25
IdeasPS IdeasPS 7 years ago
$PANL looks great for the short term
Awl416 Awl416 7 years ago
Not a post since 2015 damn
stocktrademan stocktrademan 9 years ago
$PANL recent news/filings


## source:

Thu, 14 May 2015 21:57:00 GMT ~ 5:57 pm Pangea Logistics Solutions reports Q1 results

read full:

Thu, 14 May 2015 21:54:00 GMT ~ Pangaea Logistics Solutions Ltd. Reports Financial Results for the Three Months Ended March 31, 2015

[Business Wire] - Pangaea Logistics Solutions Ltd. , a global provider of comprehensive maritime logistics solutions, announced today its results for the quarter ended March 31, 2015.

read full:

Thu, 07 May 2015 20:05:00 GMT ~ Pangaea Logistics Solutions to Report First Quarter 2015 Results

[Business Wire] - Pangaea Logistics Solutions Ltd. , a global provider of comprehensive maritime logistics solutions, today announced that it will host a teleconference to discuss the Company's first quarter 2015 financial results at 8:00 a.m.

read full:

Tue, 31 Mar 2015 20:39:00 GMT ~ Pangaea Logistics Solutions Ltd. Reports Financial Results for the Year Ended December 31, 2014

[Business Wire] - Pangaea Logistics Solutions Ltd. , a global provider of comprehensive maritime logistics solutions, announced today its results for the y

read full:

Thu, 26 Mar 2015 20:50:00 GMT ~ Pangaea Logistics Solutions to Report Year End 2014 Results

[Business Wire] - Pangaea Logistics Solutions Ltd. , a global provider of comprehensive maritime logistics solutions, today announced that it will host a teleconference to discuss the Company's year end 2014 financial results at 8:00 a.m.

read full:

$PANL charts

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$PANL company information

## source:

Ticker: $PANL
OTC Market Place: Not Available
CIK code: not found
Company name: Pangaea Logistics Solutions Ltd.
Incorporated In:

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$PANL share structure

## source:

Market Value: Not Available
Shares Outstanding: Not Available
Float: Not Available
Authorized Shares: Not Available
Par Value: Not Available

$PANL extra dd links

Company name: Pangaea Logistics Solutions Ltd.
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$PANL DD Notes ~
FreeGrass FreeGrass 10 years ago
Move over OLED! Here comes ULED.

UHD actually means better pixels, not just more pixels

FreeGrass FreeGrass 10 years ago
Samsung to launch QD TVs this year

LG plans QD panels for customers

Samsung Electronics could be moving to introduce an ultrahigh-definition LCD TV using quantum dot technology later this year, said a source familiar with the matter.

This comes as the performance of Korea’s largest TV manufacturer and its display affiliate’s next-generation OLED panels and TVs has lagged behind those of their rivals LG Electronics and LG Display.

“Samsung Electronics aims to produce UHD QD LCD TVs in small quantities in the fourth quarter of this year,” the source said.

“It may have felt that it needed to prove its technological prowess by introducing upgraded models following its latest UHD LCD TVs, amid slow progress in producing large OLED panels.”

Samsung Display, for its part, said it had no information regarding the QD TVs.

QD displays consist of nanoparticles of semiconductor materials that offer much better picture quality with improved color saturation than traditional LCD displays, industry sources said.

They can further boost the LCD’s color distinctions measured by its gamut, putting its display features on close par with OLEDs.

“If the QD is fitted into LCD panels, it can improve the color gamut by up to 130 percent in a level similar to OLED panels,” said Han Cheol-jong, head of the Korea Electronics Technology Institute’s display convergence research center.

Samsung has been pushing to develop its RGB-OLED technology using red, green and blue pixels to generate white, but reportedly faced difficulties in mass producing the display with high yields.

LG, meanwhile, has been plowing ahead with its White-OLED, which has been considered a better technology for the development of large OLED TVs.

Although LG Electronics has not revealed plans to roll out QD TVs this year, its subsidiary LG Display is developing the QD panel to compete with Samsung and for its main overseas customer Apple, according to industry sources.

Apple, whose mass production plan for its iTV has been delayed to at least next year, is said to be mulling various options including using OLED panels for its smart TV.

Sony and Amazon have already released QD products -- the Bravia TV and tablet PC Kindle Fire, respectively.

The global quantum dot display market is expected to soar to $200 million by 2020 from $10 million in 2013, according to global researcher IHS.
FreeGrass FreeGrass 10 years ago
Who or what is OLEDWorks?
FreeGrass FreeGrass 10 years ago
Told ya...
The reason I believe is that they're all on the QTMM board, and don't want to expose themselves...
robweis robweis 10 years ago
Okay Yahoo guys and gals, had enough of Rich? I think I can control him here.
FreeGrass FreeGrass 10 years ago
Good luck then! Are you following QMC? Hope you drop by that board...
OLED is a failed technology that won't be around much longer ones QDs are ready for prime time! ;)
Good luck!
robweis robweis 10 years ago
Thanks, Danny. I might have better luck.
FreeGrass FreeGrass 10 years ago
I've tried this, but no takers... On the Yahoo board they can use multiple IDs, something they can't do here... And it would expose the OLED guys from the QTMM board... ;)
But Good Luck!
robweis robweis 10 years ago
I was able to see the LG and Samsung OLED TVs side by side at BestBuy, near Princeton. I have to say, whether they can mass produce them or not, the Samsung picture had way more "POP!".

Way more.
robweis robweis 10 years ago
Earning release on 5/8?!?
robweis robweis 10 years ago
See : sammobile
"Reports about the Galaxy S5 doing extremely well in its initial launch have been coming in thick and fast over the last few days, and now, a report from The Telegraph has revealed that existing iPhone owners could be a considerable force behind the high Galaxy S5 adoption rate. According to the report, which quotes data from CompareMyMobile, 38 percent of the users upgrading to a Galaxy S5 were coming from an iPhone. Most of these upgraded from the older iPhone 4s, but Samsung should still be pretty happy about the fact that these consumers decided to opt for its flagship instead of upgrading to the newest device in Apple’s lineup."
robweis robweis 10 years ago
Yahoo refugees welcome.
FreeGrass FreeGrass 10 years ago
Where are all the OLED investors?
FreeGrass FreeGrass 11 years ago
Quantum Dots - The Next Generation Of Displays

A must read about combining Quantum dots with polymer OLED (PLED)
FreeGrass FreeGrass 11 years ago
Flat-panel electronic displays
a triumph of physics, chemistry and engineering

This paper describes the history and science behind the development of modern flat-panel displays, and assesses future trends. Electronic displays are an important feature of modern life. For many years the cathode ray tube, an engineering marvel, was universal, but its shape was cumbersome and its operating voltage too high. The need for a flat-panel display, working at a low voltage, became imperative, and much research has been applied to this need. Any versatile flat-panel display will exploit an electro-optical effect, a transparent conductor and an addressing system to deliver data locally. The first need is to convert an electrical signal into a visible change. Two methods are available, the first giving emission of light, the second modulating ambient illumination. The most useful light-emitting media are semiconductors, historically exploiting III–V or II–VI compounds, but more recently organic or polymer semiconductors. Another possible effect uses gas plasma discharges. The modulating, or subtractive, effects that have been studied include liquid crystals, electrophoresis, electrowetting and electrochromism.

A transparent conductor makes it possible to apply a voltage to an extended area while observing the results. The design is a compromise, since the free electrons that carry current also absorb light. The first materials used were metals, but some semiconductors, when heavily doped, give a better balance, with high transmission for a low resistance. Delivering data unambiguously to a million or so picture elements across the display area is no easy task. The preferred solution is an amorphous silicon thin-film transistor deposited at each cross-point in an X–Y matrix.

Success in these endeavours has led to many applications for flat-panel displays, including television, flexible displays, electronic paper, electronic books and advertising signs.

Read much much more...
FreeGrass FreeGrass 11 years ago
Emitter lifetimes are still different between the colors. But the burn in mainly happens because of the degradation of 1 color. If you buy an OLED TV (for $13.000) and you watch a lot of CNN or CNBC with the ticker at the bottom, that area's colors will degrade differently from the rest of the screen. And that's why you get burn in with OLED. This can never happen with (QDEF) LCD because the back light is always on.

Watson9 Watson9 11 years ago
The video in the link was:
Published on Apr 19, 2012
And states;
"Amoled image persistency possibly due short life of blue emitters. The usage of this phone is unknown and could have been a display model. No sound in video"

FreeGrass FreeGrass 11 years ago
AMOLED burn in problem video

This is a big problem for OLED if they ever want to make a TV. Just imagine paying $13.000 for a TV that has a burn in problem after a few months...

Nikodemos Nikodemos 11 years ago
Ok, thanks! Appreciate the webcast info & summary.
Watson9 Watson9 11 years ago
That article is a year old and was written by the PR man Nanosys Inc.
Not exactly an objective opinion.
FreeGrass FreeGrass 11 years ago
No, for the coming years PANL delivers commercial red and green PHOLED materials to Samsung for mobile phone displays. And research quantities to a few other display manufacturers. You can hear a presentation from todays webcast here.

Cowen and Company 41st Annual Technology, Media & Telecom Conference (May 29, 2013 from 3:30-4:10)
Nikodemos Nikodemos 11 years ago
Are these guys developing a 4K player? New here...just wondering
it they had plans for a 4K streamer to upload to PLAY 4K content?


dws dws 11 years ago
Thanks so much for saving us FreeGrass.

A pitiful reply IMO.
FreeGrass FreeGrass 11 years ago
If there ever was a better short, I would love to know about it...
FreeGrass FreeGrass 11 years ago
A must read for OLED lovers!

QDEF seems to be a viable alternative to OLED. What technical advantages and disadvantages does QDEF have over OLED

A new LCD backlighting technology from material science company, Nanosys Inc, delivers the promises of OLED displays at LCD prices.
FreeGrass FreeGrass 11 years ago
Because I have been following this stock for 11 years, and nobody else was moderator here. Feel free to take over!
Watson9 Watson9 11 years ago
Seems like a silly and sarcastic response.
Why are you moderator of a message board about a stock you seem to hate?
Why is there a sticky post that is about a technology PANL does not make?
Promote "quantum dots" on those company's stock boards not here.
FreeGrass FreeGrass 11 years ago
Manipulation by some of the 90% institutional investors and high-frequency trading are my best guesses...
Watson9 Watson9 11 years ago
What just happened to cause this spike?
FreeGrass FreeGrass 11 years ago
That's just a rumor... Flexible OLED will almost be impossible to make, because it is hard to make flexible encapsulation technology to protect the organic molecules from reacting with moisture. It'll probably be a quantum dot flexible display...
Marvy Marvy 11 years ago

Here is another.

According to a Korea Times report today, Google's (NASDAQ: GOOG ) top brass has just approved a business proposal from Samsung Display to use high-end OLED screens in the commercial version of Google Glass.

Image source: Google.

Of course, it's hard to think of a more compelling use for OLED technology, which can be made flexible, nearly unbreakable and, most importantly in this case, transparent.
Such an OLED lens incorporated into Google Glass, then, is a perfect application for the tech, and fits beautifully with some of the concepts Samsung envisioned way back in 2011:

On one hand, the folks at Samsung have been demonstrating transparent OLED concept devices as far back as 2010, and the company is currently one of just a few with the necessary OLED manufacturing capacity to not only supply screens for other businesses' products like Google Glass, but also for its own OLED televisions (set to arrive in July), and existing Galaxy series smartphones and tablets.
Even so, if confirmed, today's news would represent one of the first tangible, wide-scale products to feature transparent OLED.
LG Display, on the other hand, is still focusing on increasing production yields for its own OLED televisions, as well as further developing its OLED lighting solutions. Then there's Taiwan-based AU Optronics (NYSE: AUO ) , which helped both Sony and Panasonic build the 56-inch OLED TV prototypes showcased at this year's Consumer Electronics Show. AUO also claimed this week at the 2013 Society for Information Display conference that it has built the world's largest OLED panel to date, at 65 inches. However, AUO still hasn't perfected its mass production techniques, and continues to struggle with improving yields to build smaller-size OLED screens.
FreeGrass FreeGrass 11 years ago
Samsung-LG Misstep on TV Screens Creates Opening for Sony

By Jungah Lee & Mariko Yasu - May 22, 2013 12:25 PM GMT+0200

The misstep by the Koreans has created an opening for Sony Corp. (6758), Sharp Corp. and Chinese maker Skyworth Digital Holdings Ltd (751). Those companies are introducing TVs using conventional liquid-crystal displays that offer resolutions rivaling the new technology for about half the price.

The world’s two biggest television makers have struggled to profitably manufacture sets with organic light-emitting diodes, which have a brighter and sharper picture than the LCDs used in most TVs. Though both companies said they would mass-market OLED TVs last year, LG’s first model, priced at 11 million won ($9,900), hit stores in South Korea in January and Samsung still isn’t selling one.

Samsung (005930) and LG are now pivoting, with plans to boost output of LCD sets to maintain their dominance of the industry. Sony, meanwhile, is seeking to capture a greater share of the market for ultra-high definition TVs -- forecast to rise sevenfold by 2015 -- by expanding its range of LCD sets.

“Samsung and LG both misjudged the ultra-high definition market,” said Jeon Byung Ki, an analyst at E*Trade Korea Co. in Seoul. “Now they’re thinking they may have to stick with LCD technology for a while.”

Spokesmen for both Samsung and LG said their companies remain committed to OLEDs, yet they will expand their offerings of ultra-high-definition sets using LCD technology.

‘Taxi Driver’

Worldwide shipments of ultra-high-definition LCD panels will probably rise to 2.6 million this year from 63,000 last year, researcher DisplaySearch said.

Sony is moving into the niche between conventional LCDs and OLEDs with a technology it dubs 4K. The world’s No. 3 TV maker last month started selling a 55-inch set for $5,000, and in November it introduced an 84-inch model for $25,000.

The Tokyo-based company has lost money on TVs for the last nine years. Chief Executive Officer Kazuo Hirai said in January that TVs offering ultra-high resolution were part of his effort to “surprise and delight” consumers.

Sony’s board is discussing a proposal by hedge-fund manager Daniel Loeb to sell as much as 20 percent of the entertainment business and focus on electronics. Hirai has vowed to make the TV division profitable in the year ending March 2014, selling 16 million sets. Samsung delivered more than 51 million flat-screen TVs worldwide in 2012 and LG sold about 30 million.

Spurring Demand

Sony, which offers its studio’s films in ultra-high-definition 4K to cinemas, is now making films available for buyers of its TVs. The company is converting some older films, including “Lawrence of Arabia” and “Taxi Driver,” to download to 4K Bravia sets starting this year.

“Sony is taking actions to spur demand for its 4K lineup,” said Hisakazu Torii, an analyst for DisplaySearch in Tokyo. “The two South Korean makers will have to offer 4K sets to tap the trend, and they will likely move fast.”

Hong Kong-based Skyworth has spotted the same opportunity. The company in November released four models with screens as wide as 84 inches costing as much as 100,000 yuan ($16,300). Last month, Skyworth added a 39-inch set costing about 7,000 yuan. Sharp, Japan’s third-largest TV producer, unveiled new 4K models under the Aquos brand yesterday.

Samsung and LG sell almost half of all TVs worldwide. Samsung had 28 percent of the industry’s revenue last year and LG had 15 percent, according to DisplaySearch. Yet total global shipments fell 1 percent, the first decline ever, the researcher said.

$36,000 TV

The Korean companies each have only one ultra-HD LCD model on the market. LG introduced an 84-inch set last July that’s available in 100 countries for about $22,000. Models measuring 65 and 55 inches may be released later this year, according to the Seoul-based company. Samsung offers an 85-inch set in South Korea and Europe for about $36,000 and says it will add two smaller models next month.

Samsung and LG bet on OLEDs because the screens use less power and are thinner than conventional LCD models while offering a better image. Both companies showed 55-inch prototypes at the 2012 Consumer Electronics Show in Las Vegas that were thinner than Apple Inc (AAPL).’s iPad.

Yet the companies haven’t been able to boost production enough to achieve the economies of scale that they have with LCDs. That means sales may be slow to take off. Deliveries of OLED TVs may rise to 2.1 million sets in 2015 from 34,000 in 2012, according to an estimate last year by market researcher IHS Inc. (IHS)’s iSuppli.

Sony’s OLED

E*Trade Korea predicts OLEDs will account for about 10 percent of TV shipments in 2016.

Sony in 2007 introduced the first OLED TV, with an 11-inch screen, though at $2,500 it failed to stoke demand. Last year, Sony and Panasonic Corp (6752). announced a partnership to develop more OLED sets.

Samsung started investing in facilities for OLEDs, used mostly in its Galaxy smartphones, in 2006. The company has spent 7.9 trillion won in the past two fiscal years developing OLEDs, both for TVS and its mobile devices. LG’s investment in OLED TV panels in 2012 and this year will total 1.1 trillion won.

The Koreans started moving away from LCDs because profits in the segment have been declining since 2004, and they needed a new growth market, according to Chung Won Suk, an analyst at HI Investment & Securities Co. in Seoul.

Profits at Samsung’s consumer electronics division, which includes TVs, fell by more than half, to 230 billion won, in the first quarter. LG said in April that profit at its TV unit dropped to 30 billion won from 164 billion won a year earlier.

“OLEDs aren’t offering much advantage in price and resolution as the technology needs more improvement,” said Chung. “It’s way too early to commercialize it, which is why the Korean companies need ultra-HD TVs.”

To contact the reporters on this story: Jungah Lee in Seoul at; Mariko Yasu in Tokyo at
FreeGrass FreeGrass 11 years ago
Samsung and LG Step Back from OLED

by Jeff Kleist on May 23, 2013 at 2:57 pm

TV makers have been trying for years to get OLED moving. The high-quality display technology is self-illuminating, fast, and bright, with superior contrasts and no motion issues — truly the best that LED and plasma displays have to offer, all wrapped up in one screen technology. Unfortunately, despite some promising new solutions, OLED TVs remain 5 to 6 times more expensive than their top end LCD or plasma counterparts, and apparently that is starting to prove too costly for Samsung and LG, the leading Korean TV manufacturers.

The world’s two biggest television makers have struggled to profitably manufacture sets with organic light-emitting diodes, which have a brighter and sharper picture than the LCDs used in most TVs. Though both companies said they would mass-market OLED TVs last year, LG’s first model, priced at 11 million won ($9,900), hit stores in South Korea in January and Samsung still isn’t selling one.

Samsung … and LG are now pivoting, with plans to boost output of LCD sets to maintain their dominance of the industry. Sony, meanwhile, is seeking to capture a greater share of the market for ultra-high definition TVs — forecast to rise sevenfold by 2015 — by expanding its range of LCD sets.

“Samsung and LG both misjudged the ultra-high definition market,” said Jeon Byung Ki, an analyst at E*Trade Korea Co. in Seoul. “Now they’re thinking they may have to stick with LCD technology for a while.”

While 4K and OLED aren’t mutually exclusive — several 4K OLED prototypes were shown at this year’s CES — today’s Ultra HD displays all rely on LED-lit LCD panels, and Sony’s 55-inch XBR-55X900A 4K display sells for about half the cose of LG’s identically sized 1080p OLED TV. Until yields improve, it seems like the OLED TVs are going to keep treading water awhile longer.
FreeGrass FreeGrass 11 years ago
Inkjet-printed graphene opens the door to foldable electronics

Imagine a bendable tablet computer or an electronic newspaper that could fold to fit in a pocket.

The technology for these devices may not be so far off. Northwestern University researchers have recently developed a graphene-based ink that is highly conductive and tolerant to bending, and they have used it to inkjet-print graphene patterns that could be used for extremely detailed, conductive electrodes.

The resulting patterns are 250 times more conductive than previous attempts to print graphene-based electronic patterns and could be a step toward low-cost, foldable electronics.

A paper describing the research, "Inkjet Printing of High Conductivity, Flexible Graphene Patterns," was published April 8 in the Journal of Physical Chemistry Letters ("Inkjet Printing of High Conductivity, Flexible Graphene Patterns").

"Graphene has a unique combination of properties that is ideal for next-generation electronics, including high electrical conductivity, mechanical flexibility, and chemical stability," said Mark Hersam, professor of materials science and engineering at Northwestern's McCormick School of Engineering and Applied Science. "By formulating an inkjet-printable ink based on graphene, we now have an inexpensive and scalable path for exploiting these properties in real-world technologies."

Inkjet printing has previously been explored as a method for fabricating transistors, solar cells, and other electronic components. It is inexpensive, capable of printing large areas, and can create patterns on a variety of substrates, making it an attractive option for next-generation electronics.

Inkjet printing with graphene — ultra-thin sheets of carbon with exceptional strength and conductivity — is extremely promising, but it has remained a challenge because it is difficult to harvest a sufficient amount of graphene without compromising its electronic properties. Exfoliating, or breaking apart, materials such as graphite often require oxidizing conditions that make the resulting graphene oxide material less conductive than pure carbon. Pristine unoxidized graphene can be achieved through exfoliation, but the process requires solvents whose residues also decrease conductivity.

The Northwestern researchers have developed a new method for mass-producing graphene that maintains its conductivity and can be carried out at room temperature using ethanol and ethyl cellulose to exfoliate graphite. This relatively clean process minimizes residues and results in a powder with a high concentration of nanometer-sized graphene flakes, which is then mixed into a solvent to create the ink.

The researchers demonstrated printing the ink in multiple layers, each 14 nanometers thick, to create precise patterns. The ink's conductivity remains virtually unchanged, even when bent to a great degree, suggesting that graphene inks could be used to create foldable electronic devices in the future.
FreeGrass FreeGrass 11 years ago
Yes, its all theoretical, but QDs with a perfectly made core-shell does not have an intrinsic lifetime failure mechanism. I guess they aren't able to make a prefect shell yet. That's where QMC comes in IMHO... OLED lifetime depends on barrier coatings...
Watson9 Watson9 11 years ago
Interesting article about QLEDS but it does sort of go against your point of OLED having lifetime issues.
One of the last sentences is "The biggest challenge facing QLEDs, especially after this efficiency milestone, is in the reliability or lifetime of the devices," Coe-Sullivan said. "While current devices do live long enough for some niche applications, they are not generally sufficient for mainstream market introduction."

FreeGrass FreeGrass 11 years ago
Quantum dot LED approaches theoretical maximum efficiency

May 14, 2013

Quantum dot LEDs (QLEDs) are a promising technology for creating large-area displays that could have applications for TVs, cell phones, and digital cameras. So far, however, the highest efficiencies of QLEDs have fallen short of those of organic LEDs (OLEDs), another large-area LED technology. Now in a new study, researchers have developed a new type of QLED with an efficiency and luminance that are the highest reported to date and comparable to state-of-the-art phosphorescent OLEDs. The new QLED's external quantum efficiency of 18% more than doubles the current highest value of which the researchers are aware, which is 8%. The efficiency is also close to the theoretical maximum for any planar thin-film LED, which is 20%.

The work was performed by researchers Benjamin S. Mashford, et al., at QD Vision Incorporated in Lexington, Massachusetts, along with researchers at MIT. QD Vision is a lighting and display company whose products are available today in Sony's Triluminos TVs. Their paper is published in a recent issue of Nature Photonics.

While QLEDs and OLEDs each have their own unique advantages, QLEDs are especially appealing for their narrow bandwidth and simple color tunability, since changing the size of a quantum dot changes its emission wavelength. QLEDs, which often contain both organic and inorganic materials, may also have longer lifetimes than OLEDs, which are based on organic materials.

A typical QLED consists of three layers: one inner layer of quantum dots, one outer layer that transports electrons, and one outer layer that transports holes. When an electric field is applied to the outer layers, the electrons and holes move into the quantum dot layer, where they are captured by quantum dots and recombine. The recombination of one electron and one hole inside a quantum dot results in the emission of one photon.

As the researchers explain in their study, a key requirement for achieving QLEDs with very high efficiencies is to have quantum dots that have a high quantum yield for electroluminescence and a device structure that is optimized for efficient charge injection.

The researchers addressed these requirements by using a layer of 6-nm cadmium-selenide quantum dots and an electron transport layer made of ZnO nanocrystals. The researchers fabricated four different versions of the QLED, each having a different quantum dot film thickness (15, 30, 45, or 60 nm).

The experiments revealed that even small variations in the quantum dot film thickness lead to a dramatic variation in QLED performance. The QLED with the 45-nm-thick film of quantum dots achieved the highest maximum external quantum efficiency of 18%, making it the highest-efficiency red LED ever made using a solution-processed emitter layer. The QLEDs also operated at low voltages (1.5 V) and with high brightness.

As the researchers explain, changing the quantum dot film thickness changes the distance between the quantum dots and the charge transport layers; a thinner quantum dot film means a larger fraction of quantum dots are in electrical contact with the outer layers.

"Devices have been tried in the literature that range from very thick to very thin (monolayer) layers of QDs, but it has remained very elusive to say what is 'the best' thickness to use," coauthor Seth Coe-Sullivan, co-founder and Chief Technology Officer of QD Vision, told "It isn't surprising that the performance was so dependent on thickness, but I would say that the optimum answer was surprising to me."

The researchers think that the observed dependence of QLED performance on the layer thickness can be explained in more detail by recent findings on quantum dot research. Their proposed explanation involves an ultrafast charge transfer, in which quantum dots are rapidly returned to a neutral charge state, which leads to increased stability. In addition, a good alignment of energy levels between the quantum dots and the charge-injection layers also assists in efficient charge transfer.

Overall, these improvements are possible due to scientists' growing knowledge of quantum dot photophysics, and the researchers expect QLED technology to continue to grow as this knowledge increases.

"The biggest challenge facing QLEDs, especially after this efficiency milestone, is in the reliability or lifetime of the devices," Coe-Sullivan said. "While current devices do live long enough for some niche applications, they are not generally sufficient for mainstream market introduction.

"QD Vision will continue to push performance and manufacturability of QLEDs, both for visible and infrared applications of the technology."
Marvy Marvy 11 years ago
As I said before. I am looking for a good time to get back in.
And yes, I did take a look at qtmm :)
FreeGrass FreeGrass 11 years ago
Looking at this chart, bottoms and tops continue to be lower. So I can see this going below $20. But one never knows what PANL is doing with the buyback. A PE of 137 isn't really sustainable, is it?

And there wasn't a gap down today, so no reason to go up anytime soon...

Marvy Marvy 11 years ago
Still think under $20? I'm thinking $25-26 by mid next week.
Marvy Marvy 11 years ago
Drop today almost time to buy again
FreeGrass FreeGrass 11 years ago
This article explains the difference between OLED and QDs pretty good. Hope to see you on the QTMM board.
Marvy Marvy 11 years ago
It may not make it. But I am not complaining, I'll just try to buy and sell at the right spots.
I will look into quantum dots. I have read about them before

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