OLED Lifetime: introduction and market status - Page 24

Novaled achieved unsurpassed lifetime results for top and bottom emitting red fluorescent devices. A red bottom emitting Novaled PIN OLEDTM shows a luminance drop of only 4% after 6000 hours measurement at a starting brightness of 3,700 cd/sqm. The record top emitting red PIN OLED shows a luminance drop of even only 1% after 1,000 hours measurement at a starting brightness of 12,000 cd/sqm. Both OLEDs are down calculated to more than one million hours (corresponding to one century) at starting brightness of 1,000 cd/sqm.

Novaled has also reached significant achievements for blue fluorescent PIN OLEDs: 50,000 hours at 500 cd/sqm in bottom emission answering the request of RGB Active Matrix displays.

In addition, major lifetime improvements have been shown for green phosphorescent PIN OLEDs (100,000 hours at 500 cd/sqm for Ir(ppy)3 based top emission OLEDs). With this value Novaled has doubled its performance for Ir(ppy)3 based green OLED stacks during the last twelve months. We are confident to reach one million hours lifetime with more performing phosphorescent emitting material, says Jan Blochwitz-Nimoth, CTO of the company.

Cambridge Display Technology and Sumation are pleased to announce new and improved results for green and blue PLED materials.

Data from spin coated devices using a common cathode and a recently developed solution processable green PLED material demonstrate lifetimes(1) of 50,000 hours from an initial luminance of 1000 candelas per square meter, or cd/sq.m. This is equivalent(2) to over 285,000 hours from an operating brightness of 400cd/sq.m for this material and represents a 40% increase in lifetime compared to results announced on March 27, 2007.

The OLLA project aims to demonstrate in 2008 a device with 50 lumens per watt, a lifetime of 10,000 hours at an initial brightness of 1,000 cd/m2, with a minimum tile size of 15 x 15cm.

The latest white-light OLED panel roduced by OLLA has an efficacy of 25 lumens per watt, a lifetime of over 5,000 hours from an initial brightness of 1,000 cd/m2.

OLED-T has demonstrated red, green and blue flexible single colour displays manufactured on a plastic substrate using its OLED materials. The demonstrator displays have been developed using a new family of materials developed by OLED-T that can be deposited by vacuum evaporation at manufacturing temperatures around 300oC. This relatively low temperature has enabled OLED-T to demonstrate flexible plastic OLEDs based on vacuum deposition for the first time.

OLED-T is now focussing research and development effort on encapsulation methods to improve the lifetime of its plastic devices. The lifetime of the initial demonstrator red devices was 60 hours at a luminance of 100 cdm-2 and 72 hours for green devices. The limited lifetime is due to high moisture permeability. The corresponding devices manufactured on a glass substrate have lifetimes in excess of 32,000 hours for the same device structure.

Samsung SDI expects prices of its next-generation flat screens to fall to the same level as liquid crystal displays by 2010, a senior executive said.

Chung was referring to a new display technology - offering brighter screens and lower power use - which Samsung SDI hopes to mass-produce from the third quarter of this year and, by 2009, to use in television sets.

OLED-T today announced a new patented host material for OLED displays that delivers significant performance benefits compared with existing materials. The host layer is a crucial layer in the make-up of an OLED display as it impacts its performance including efficiency and lifetime. The new OLED-T material, called E746, is targeted as a direct replacement and upgrade path for aluminium quinolate (Alq3), the host material most commonly used throughout the OLED industry.

OLED-T has developed E746 for OLED displays in the mobile market such as mobile phones and digital cameras where its power consumption and lifetime performance benefits are expected to deliver improved product performance.

In fluorescent red and fluorescent green customer OLED display devices, OLED-T’s E746 material outperforms Alq3 in terms of energy efficiency, colour co-ordinates, lifetimes and voltage drift. E746 enables OLED displays to be manufactured with a current efficiency increase of between 30% and 50%, a power efficiency improvement of as much as 45 to 80 per cent and a lifetime increase of 100 per cent for fluorescent red and 200 per cent for fluorescent green.

Universal Display Corporation and Nippon Steel Chemical today announced a new PHOLED emitter material from Universal Display, called UDC-RD39, and the exciting collaborative results of combining this new emitter material with NSCC's commercial NS11 host material.

When combined with NS11, this new bright-red PHOLED emitter, with CIE coordinates of (0.65, 0.35), exhibits a luminous efficiency of 24 candelas per Ampere (cd/A), corresponding to a 19% external quantum efficiency, at 1000 candelas per square meter (cd/m2). Under accelerated testing conditions, this new red emitter demonstrates an operating lifetime of approximately 220,000 hours, at an initial luminance of 1000 cd/m2. These dramatic performance gains represent a 60% increase in luminous efficiency and five-fold increase in lifetime, as compared to Universal Display's first-generation commercial red PHOLED emitter. As a result, Universal Display's second-generation emitter in combination with NSCC's host material may be well suited to meet the performance requirements for TV and other demanding product applications.

Cambridge Display Technology (CDT) and Sumation are pleased to announce new growth in lifetime metrics for red, green, blue, and white PLED materials.

Data results from spin coated devices using a common cathode and solution processable materials developed in 2006 demonstrate that lifetimes(a) of 24,000, 35,000, 10,000, and 5,200 hours for red, green, blue, and white, respectively, have been achieved from an initial luminance of 1000 cd/m². This is equivalent(b) to over 150,000, 198,000, 62,000, and 27,000 hours from an operating brightness of 400cd/sq.m for these materials.

Novaled has achieved groundbreaking results in lifetime, voltage and efficiency of top emitting RGB stacks with its PIN OLED technology. Lifetimes for blue OLEDs are up to 16,000 hours, for red and green up to 100,000 hours at an initial brightness of 500 cd/m². This latest performance means that green OLED devices are now outperforming their bottom emission reference samples by a factor of 2.5. White top emission devices achieved a lifetime of 18,000 hours at a driving voltage of 3 V and a starting luminance of 1,000 cd/m².

The lowest ever reported operating voltage has been realised for green top emission OLED stacks of 2.5 V at 1,000 cd/m². At 95 cd/A, the current efficiency is even higher than for comparable bottom emission devices. These green devices are based on standard emitter material Ir(ppy)3.

Nippon Steel Chemical and Universal Display Corporation today announced significant enhancement in the performance of green phosphorescent OLEDs resulting from their ongoing technical collaboration.

By combining Universal Display's green phosphorescent emitter, UDC-GD48, with NSCC's new green host material, the two companies have achieved record operational lifetime for a green phosphorescent OLED device. This green OLED offers 60,000 hours of operational lifetime at an initial luminance of 1,000 candelas per square meter (cd/m(2)). The device also exhibits a high luminous efficiency of 65 candela per ampere (cd/A) and an external quantum efficiency of 18%, at 1,000 cd/m(2), both characteristic features and benefits of phosphorescent OLED technology. The color coordinates for this device in a standard bottom-emission structure are C.I.E. (0.35, 0.61).