Hybrid white organic light-emitting devices consisting of a non-doped thermally activated delayed fluorescent emitter and an ultrathin phosphorescent emitter

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• 作者：Juan Zhao^a ; ^b ; Zijun Wang^a ; Run Wang^a ; Zhenguo Chi^b ; ^{chizhg@mail.sysu.edu.cn} ; Junsheng Yu^a ; ^{jsyu@uestc.edu.cn}
• 关键词：White organic light-emitting device ; Non-doped emitting layer ; Thermally activated delayed fluorescent ; Ultrathin phosphorescent emitter
• 刊名：Journal of Luminescence
• 出版年：2017
• 出版时间：April 2017
• 年：2017
• 卷：184
• 期：Complete
• 页码：287-292
• 全文大小：1962 K
• 卷排序：184

文摘

Hybrid white organic light-emitting devices (OLEDs) are fabricated by employing non-doped emitting layers (EMLs), which are consisted of a blue thermally activated delayed fluorescent (TADF) emitter 9,9-dimethyl-9,10-dihydroacridine-diphenylsulfone (DMAC-DPS) and an ultrathin yellow iridium complex bis[2-(4-tertbutylphenyl)benzothiazolato-N,C2′] iridium (acetylacetonate) [(tbt)2Ir(acac)]. With thickness optimization of DMAC-DPS, a white OLED achieves maximum current efficiency, power efficiency and external quantum efficiency of 34.9 cd/A, 29.2 lm/W and 11.4%, respectively, as well as warm white emission with relatively stable electroluminescence spectra. The results suggest that, bipolar charge carrier transport property and concentration independent property of DMAC-DPS, charge carrier trapping effect of the ultrathin (tbt)2Ir(acac), and balanced self-emission process and energy transfer process between DMAC-DPS and (tbt)2Ir(acac), contribute to high device performance.