Universal Display Presents White OLED Advances
Universal Display Corp. of Ewing, N.J., announced advances in its development of white organic light-emitting diode (WOLED) technology for solid-state lighting and flat panel display applications this week at SPIE's Optics & Photonics conference, being held in San Diego, Calif. Bert Alleyne, senior scientist at Universal Display, presented a paper, "White phosphorescent organic light-emitting devices for lighting applications," that highlighted progress in power efficiency, a critical performance parameter for lighting. He reported that the company has achieved a white light source with twice the power efficiency of a standard incandescent bulb and an external quantum efficiency among the highest demonstrated for a single (non-stacked) white OLED. Specifically, the white light source demonstrated 31 lumens per watt, which corresponds to an external quantum efficiency of 29 percent at a luminance of 850 candelas per square meter. The white lighting panel (25 cm squared in size) emits a pleasing, warm white tone with CIE coordinates of (0.37, 0.36), he said. Output coupling enhancements under development at Universal Display and use of its high-efficiency phosphorescent OLED technology and materials made the advance possible, he added. Universal Display's technology is used by the flat panel display, lighting, electronic communications and other optoelectronic markets.
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