Research Highlights: Reserch Group from National Tsing Hua University, Taiwan Develops Long Lived Pure White OLEDS

Aug 4, 2011 In a recent Article published by ACS Applied materials & Interfaces, a research group from Taiwan discusses development of novel pure white Organic Light-Emitting Diode with lifetime approaching the longevity of yellow emitter.

The lifetime of the reported white OLED was also found to be six times longer than of the deep-blue counterpart.

According to the article, the white device was composed of two emission layers with mixed hosts of different compositions. They were respectively doped with yellow rubrene and deep-blue 4,4′-bis-[4-{N,N,N′,N′- tetrakis-(4-fluoro-diphenylamino)-phenyl}-vinyl]-biphenyl. The resulting efficiency was 6.0 lm/W (12.4 cd/A) at 20 mA/cm2.The authors think, that the long device lifetime may be attributed to the double mixed-host architecture employed that effectively dispersed the injected carriers into three different recombination zones and consequently diluted the damaging effect arising from the accumulated charge from un-recombined carriers, hence leading to a markedly improved lifespan.

The original article can be found here: http://pubs.acs.org/doi/abs/10.1021/am2006383

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