Using Interlayer Step-Wise Triplet Transfer to Achieve an Efficient White Organic Light-Emitting Diode with High Color-Stability

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Using Interlayer Step-Wise Triplet Transfer to Achieve an Efficient White Organic Light-Emitting Diode with High Color-Stability

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title Using Interlayer Step-Wise Triplet Transfer to Achieve an Efficient White Organic Light-Emitting Diode with High Color-Stability
contributor.author Wang, Qi
contributor.author Ma, Dongge
contributor.author Leo, Karl
contributor.author Ding, Junqiao
contributor.author Wang, Lixiang
contributor.author Qiao, Qiquan
contributor.author Jia, Huiping
contributor.author Gnade, Bruce E.
contributor.ISNI 0000 0003 8371 1336 (Gnade, BE)
contributor.LCNA 00049719‏ (Gnade, BE)
description.abstract An efficient phosphorescent white organic light emitting-diode with a red-green-blue 3tri-emitting-layer structure is reported. The host of the red dopant possesses a lower triplet-energy than the green dye. An interlayer step-wise triplet transfer via blue dye -> green dye -> red host -> red dye is achieved. This mechanism allows an efficient triplet harvesting by the three dopants, thus maintaining a balanced white light and reducing energy loss. Moreover, the color stability of the device is improved significantly. The white device not only achieves a peak external quantum efficiency of 21.1 +/- 0.8% and power efficiency of 37.5 +/- 1.4 lm/W but shows no color shift over a wide range of voltages.
description.sponsorship "The authors acknowledge the National Natural Science Foundation of China (No. 51333007), the Foundation of Jilin Research Council (Nos. 2012ZDGG001, 20130206003GX, and 201105028), CAS Instrument Project (No. YZ201103), China Postdoctoral Science Foundation (No. 20130201120048), and United States' NSF CAREER (No. ECCS-0950731) for the support of this research."
identifier.citation Wang, Qi, Dongge Ma, Karl Leo, Junqiao Ding, et al. 2014. "Using interlayer step-wise triplet transfer to achieve an efficient white organic light-emitting diode with high color-stability." Applied Physics Letters 104(19): 193303-1 to 4.
identifier.issn 0003-6951
identifier.uri http://hdl.handle.net/10735.1/4103
identifier.volume 104
identifier.issue 19
subject Ir(ppy)3
subject White organic light-emitting diode
subject Triplet state
subject Color
date.created 2014-05-12
publisher American Institute of Physics
relation.uri http://dx.doi.org/10.1063/1.4876215
rights ©2014 AIP Publishing LLC.
language.iso en
source.journal Applied Physics Letters

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