Idemitsu Kosan Co., Ltd. (hereafter Idemitsu) and Sony Corporation (hereafter Sony) today announced the achievement of 28.5% internal quantum efficiency (IQE) in deep blue fluorescent OLED devices, the world's highest level of luminous efficiency for this technology. This ground-breaking development is a result of Idemitsu's advanced OLED material technologies and Sony' OLED device expertise, brought together by the two companies' joint development agreement (established in November 29^th, 2005). This joint agreement has led to the development of a wide range of high-performance OLED materials that have been incorporated in Sony products, and going forward both Idemitsu and Sony will also consider various practical applications for this newly developed, world-leading blue OLED technology.

       Previous fluorescent OLED devices were limited to a maximum 25% IQE, however the implementation of new carrier transport materials and optimized device structure has led to the achievement of 28.5% IQE. Furthermore, the use of Sony's proprietary "Super Top Emission" OLED device technology has enabled blue color deepness (CIE chromaticity: 0.137, 0.065) exceeding NTSC standards to be achieved.

       With this technology significantly reducing the driving current of blue OLEDs, the most energy-intensive of the three primary RGB colors, it is expected to significantly reduce the power consumption of OLED panels, contributing to the future development of large-size OLED TVs.

       These results will be presented at "SID2008" (Society for Information Display) to be held from May 18^th, 2008 at Los Angeles, CA, U.S.A..

Specifications

Type : Blue Fluorescent OLED
Internal Quantum Efficiency : 28.5%
Luminous half decay time : Over 30k Hours
(Initial luminance: 200cd/m², Temperature: 50ºC using test pieces)
Current Efficiency : 3.9cd/A
Color Coordinate in CIE chromaticity: (0.137, 0.065)