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• W1978266437 abstract "High-performance phosphorescent organic light-emitting diodes (PhOLEDs) by using dual-emissive-layer (DEL) structure to reduce efficiency roll-off were fabricated. The DEL was comprised of a hole-transport-type host of N, N'-bis(naphthalen-1-yl)-N, N'-bis(phenyl)-benzidine (NPB) and a bipolar host of 4,4'-bis(carbazol-9-yl)biphenyl (CBP), which were both doped with an orange phosphorescent dopant of bis[2-(4-tert-butylphenyl)-benzothiazolato-N,C2']iridium (acetylacetonate) [(t-bt)(2)Ir(acac)]. After the optimization of doping concentration of the first emissive layer (FEL), the device with DEL exhibited 11% lower roll-off power efficiency than single emissive layer devices (SED) when the luminance increased from 1000 cd/m(2) to 10,000 cd/m(2). The hole-electron recombination zone in DEL was illuminated by inserting an ultrathin fluorescent probe of 4-(dicyanomethylene)-2-tert-butyl-6 (1,1,7,7-tetramethyljulolidin-4-yl-vinyl)-4H-pyran (DCJTB) in different emissive regions. The performance improvement was attributed to the optimization of energy barrier and the expansion of exciton formation zone within the DEL. (C) 2014 Elsevier B.V. All rights reserved." @default.
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• W1978266437 date "2014-10-01" @default.
• W1978266437 modified "2023-10-18" @default.
• W1978266437 title "Recombination region improvement for reduced efficiency roll-off in phosphorescent OLEDs with dual emissive layers" @default.
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• W1978266437 doi "https://doi.org/10.1016/j.jlumin.2014.04.042" @default.
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