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Pure white organic light-emitting diode with lifetime approaching the longevity of yellow emitter.

ACS applied materials & interfaces (2011-07-08)
Jwo-Huei Jou, Shih-Ming Shen, Yung-Cheng Tsai
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.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Rubrene, sublimed grade, 99.99% trace metals basis
Sigma-Aldrich
Rubrene, ≥98%
Sigma-Aldrich
Rubrene, powder
Sigma-Aldrich
4,4′,4′′-Tris[2-naphthyl(phenyl)amino]triphenylamine, 97%

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