Universal Display's Dr. Brian W. D'Andrade, Senior Scientist, presented the WOLED advances at White OLED I session with a paper titled "Efficient White Phosphorescent Organic Light-Emitting Devices." Dr. D'Andrade discussed a novel white OLED structure with an external quantum efficiency (EQE) of 20%, corresponding to a luminous efficiency of 33 cd/A. With CIE coordinates of (0.38, 0.39) and operating lifetime exceeding 4,000 hours at 1,000 cd/m(2). This is believed to be the highest EQE reported to date, for a single, non-stacked WOLED. Dr. D'Andrade also reported on the use of outcoupling enhancements to further increase the EQE to 37%. Outcoupling refers to the portion of light generated in the device that can be extracted from the device as useable light.
UDC Announces Record White OLED Advancements
Posted: May 23,2007 by Ron Mertens
