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

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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由非掺杂热激活延迟荧光发射体和超薄磷光发射体组成的混合白色有机发光器件

DOI:
10.1016/j.jlumin.2016.11.067
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发表时间:
2017-04
影响因子:
3.6
通讯作者:
Yu Junsheng
Yu Junsheng
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Zhao Juan;Wang Zijun;Wang Run;Chi Zhenguo;Yu Junsheng

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混合白色有机电致发光器件采用非掺杂发光层,由蓝色热激活延迟荧光发射体9,9-dimethyl-9,10-dihydroacridine-diphenylsulfone和超薄的黄色Ir络合物双[2-(4-叔丁基苯基)苯并噻唑-N,C2‘]Ir乙酰丙酮[(Tbt)2Ir(Acac)]组成。经过DMAC-DPS厚度优化,白光OLED的最大电流效率、功率效率和外量子效率分别达到34.9×cd/A、29.2×lm/W和11.4%,以及具有相对稳定的电致发光光谱的温白光发射。结果表明,DMAC-DPS的双极载流子输运特性和与浓度无关的特性,超薄(Tbt)2Ir(Acac)的载流子捕获效应,以及DMAC-DPS和(Tbt)2Ir(Acac)之间平衡的自发射过程和能量传递过程,有助于获得高性能的器件。
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.
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