title: Pure white organic light-emitting diode with lifetime approaching the longevity of yellow emitter.
abstract: A high-efficiency pure white organic light-emitting diode was fabricated with lifetime approaching that of the low-excitation-energy (yellow) emitter containing counterpart, or six times that of the deep-blue counterpart. 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/cm(2). 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.
authors: Department of Materials Science and Engineering, National Tsing Hua University, Hsin-Chu, Taiwan 30013, Republic of China. jjou@mx.nthu.edu.tw
authors: Jwo-Huei
authors: JH
authors: Jou
authors: Shih-Ming
authors: SM
authors: Shen
authors: Yung-Cheng
authors: YC
authors: Tsai
mesh_terms: D008029:Lighting; D009279:Naphthacenes / Q000737:chemistry; D012666:Semiconductors; D013056:Spectrophotometry, Ultraviolet
chemical_list: D009279:Naphthacenes; C045049:rubrene