Non-doped white organic light-emitting devices consisting of thermally activated delayed fluorescent emitters and ultrathin phosphorescent emitters

Qinxue Li; Zijun Wang; Yingying Yuan; Geng Feng; Jian Zhong

doi:10.1117/12.2506363

8 February 2019 Non-doped white organic light-emitting devices consisting of thermally activated delayed fluorescent emitters and ultrathin phosphorescent emitters

Qinxue Li, Zijun Wang, Yingying Yuan, Geng Feng, Jian Zhong

Author Affiliations +

Proceedings Volume 10843, 9th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronic Materials and Devices for Sensing and Imaging; 1084310 (2019) https://doi.org/10.1117/12.2506363
Event: Ninth International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT2018), 2018, Chengdu, China

Abstract

Fluorescence/phosphorescence hybrid white organic light-emitting devices (WOLEDs) with non-doped emitting layers are constructed based on blue, green and red dyes. The simplified emitting layers (EMLs) are fabricated with structure of Blue/Red/Blue/Green hybrid emitting layers consisting of an ultrathin non-doped green phosphorescence layer employing Tris(2-phenylpyridine)iridium (Ir(ppy)₃), an ultrathin non-doped red phosphorescence layer using Tris(1-(4-hexylphenyl)-isoquinolinato-C2,N)iridium(III) (Ir(h-piq)₃), and double non-doped blue thermally activated delayed fluorescence (TADF) layers using 9,9-dimethyl-9,10-dihydroacridine- diphenylsulfone (DMAC-DPS). A white OLED are fabricated with relatively stable electroluminescence spectra of white emission achieves maximum luminance, maximum current efficiency, power efficiency and external quantum efficiency of 21596cd/m², 8.45 cd/A, 11.57 lm/W and 6%, respectively. The result shows a slight variation of Commission International de l’Eclairage (CIE) coordinates (0.026, 0.051) at a luminance ranging from 32 cd/m² to 2728 cd/m². It suggests that the bipolar charge carrier transport property of DMAC-DPS contributes to control of exciton recombination in the emissive regions and balance white emission.

Citation Download Citation

Qinxue Li, Zijun Wang, Yingying Yuan, Geng Feng, and Jian Zhong "Non-doped white organic light-emitting devices consisting of thermally activated delayed fluorescent emitters and ultrathin phosphorescent emitters", Proc. SPIE 10843, 9th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronic Materials and Devices for Sensing and Imaging, 1084310 (8 February 2019); https://doi.org/10.1117/12.2506363

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KEYWORDS

Excitons

Electroluminescence

External quantum efficiency

Luminescence

Quantum efficiency

Energy transfer

Electron transport

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