Color tunable phosphorescent white OLED boosts lighting performance

Color tunable phosphorescent white OLED boosts lighting performance

Technology News |
By eeNews Europe

The advances were highlighted by Universal Display scientists in three separate papers.  In a paper entitled ‘Color Tunable Phosphorescent White-OLED Lighting Panel’, Universal Display’s Dr. Michael Weaver presented data on a new approach of fabricating red-green-blue (RGB) monochrome stripes and controlling each of the stripes with separate current drivers.

The new method claims to have the potential to improve white OLED lighting panel performance, manufacturing yield, brightness uniformity and color tunability. The latter is a key benefit of solid-state OLED lighting. The paper was co-authored by Dr. Xin Xu, Dr. Huiqing Pang, Dr. Ruiqing Ma, Dr. Pierre-Luc Boudreault, Dr. Alex Dyatkin, Dr. Sean Xia and Dr. Julie Brown and Acuity Brands’ Dr. Min-Hao Lu.

In the paper, Dr. Weaver discussed the recent demonstration of a 15 cm x 15 cm color tunable white OLED lighting panel based on an RGB monochrome striped architecture. Using this new architecture, a panel efficacy of 63 lumens per Watt (lm/W) with a correlated color temperature (CCT) of 3,000K at 2,500 cd/m2 was achieved. Additionally, the company has demonstrated an Energy Star all-phosphorescent warm white OLED with 100 lm/W power efficacy and an LT70 lifetime of 60,000 hours at 1,000 cd/m2. Dr. Weaver also reported a remarkable high R9 warm white WOLED with CRI R9 of 96.

By improving white OLED lighting device performance and tunability, Universal Display’s PHOLED technology and materials have the potential to meet growing demand for tunable white OLED lighting products. A number of UDC’s customers have already previewed these new materials for use in tunable white OLED lighting applications.

Dr. Mike Hack also presented a paper entitled ‘Novel Two-Mask AMOLED Display Architecture’ which discussed the pathway for an improvement in the lifetime of an OLED display (by as much as eight times) using a new display architecture that could enhance blue lifetime, thus reducing image sticking.

The new AMOLED display architecture may also improve the manufacturability of AMOLED displays, particularly large-area TVs, as well as increase AMOLED display resolution and lifetime, and further reduce device power consumption. The paper was co-authored by Dr. Michael S. Weaver, Dr. Woo-Young So and Dr. Julie Brown.

In a third paper entitled ‘Understanding Extrinsic Degradation in Phosphorescent OLEDs’ Dr. Hitoshi Yamamoto discussed some fundamental results of improving overall PHOLED device technology performance. The work studied the impact of process conditions during OLED device fabrication and showed that by reducing the existence of impurities, such as water, during fabrication, the device lifetime can be enhanced. The paper was co-authored by Dr. Michael S. Weaver, Dr. Julie Brown, Japan Advanced Institute of Science and Technology’s Professor Hideyuki Murata and Kyushu University’s Professor Chihaya Adachi.

Steven V. Abramson, President and Chief Executive Officer of Universal Display, said: "Our work goes well beyond developing high performance PHOLED materials. We’re developing novel ways to improve display and lighting performance and enable lower cost, high yield manufacturing processes to accelerate OLED market growth. We are aggressively targeting numerous areas of development to drive OLED technology further."

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