Universal Display and Nippon Steel Enhance Performance of Green Phosphorescent OLEDs

Tokyo, Japan and Ewing, New Jersey - Nippon Steel Chemical Co., Ltd. (NSCC), a leading manufacturer of super-purified OLED materials with consistent quality in commercial scale, and Universal Display Corporation, a leading developer of OLED technologies and materials for flat panel displays, lighting, electronic communications and other opto-electronic products, 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/m2). 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/m2, 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).

While these color and efficiency characteristics have previously been reported, obtaining this performance in conjunction with improved operational lifetime is an important milestone for Universal Display and NSCC. This represents more than a two-fold increase in operational stability, key for commercial success, as compared to previously reported performance. The device also incorporates Universal Display’s proprietary blocking layer material to achieve the reported results. UDC-GD48 is currently available from Universal Display and NSCC’s new green host material will soon be available from NSCC for evaluation and use in commercial production.

As a milestone of these collaborative development efforts, UDC and NSCC have now established material systems for red and green phosphorescent OLEDs. The companies are also collaborating on the development of blue phosphorescent materials.

“The advance in the performance of vacuum-deposited phosphorescent OLEDs is a direct result of our collaboration with NSCC, one of the world’s leading chemical companies,” said Steven V. Abramson, President and Chief Operating Officer of Universal Display. “This new achievement follows our previous announcement of excellent red phosphorescent OLED performance based on the combination of our red phosphorescent OLED emitters with NSCC’s red host material. Working with companies like NSCC through mutually beneficial collaborations should continue to accelerate the commercialization of high-performance OLED products.”

“This recent success is based on the long-term collaboration with Universal Display, which possesses excellent phosphorescent OLED technologies and materials. We are very proud that such practical red and green phosphorescent materials can be offered into the OLED market. Additionally, we are determined to realize full-color phosphorescent OLED materials, including blue phosphorescent OLED materials, which is the next milestone of the collaboration, utilizing cumulative technologies and materials based on the collaboration,” stated Yasuhiro Shimoura, Executive Officer and General Manager at Organic Display Materials Division of NSCC.

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