有机发光二极管
材料科学
光电子学
系统间交叉
电致发光
量子效率
准分子
荧光粉
激子
光致发光
二极管
荧光
光学
单重态
图层(电子)
物理
纳米技术
激发态
核物理学
量子力学
作者
Denghui Liu,Guangsai Yang,Zijian Chen,Wentao Xie,Deli Li,Wei Li,Jianying Lin,Xuewei Nie,Zhizhi Li,Liang Bian,Zhihai Yang,Zhiheng Wang,Junrong Pu,Guanwei Sun,Chenyang Shen,Mengke Li,Shi‐Jian Su
标识
DOI:10.1002/adma.202403584
摘要
Abstract Despite multiple‐resonance thermally activated delayed fluorescence (MR‐TADF) emitters with small full‐width at half maximum are attractive for wide color‐gamut display and eye‐protection lighting applications, their inefficient reverse intersystem crossing (RISC) process and long exciton lifetime induce serious efficiency roll‐off, which significantly limits their development. Herein, a novel device concept of building highly efficient tricomponent exciplex with multiple RISC channels is proposed to realize reduced exciton quenching and enhanced upconversion of nonradiative triplet excitons, and subsequently used as a host for high‐performance MR‐TADF organic light‐emitting diodes (OLEDs). Compared with traditional binary exciplex, the tricomponent exciplex exhibits obviously improved photoluminescence quantum yield, emitting dipole orientation and RISC rate constant, and a record‐breaking external quantum efficiency (EQE) of 30.4% is achieved for tricomponent exciplex p‐PhBCzPh: PO‐T2T: DspiroAc‐TRZ (50: 20: 30) based OLED. Remarkably, maximum EQEs of 36.2% and 40.3% and ultralow efficiency roll‐off with EQEs of 26.1% and 30.0% at 1000 cd m −2 are respectively achieved for its sky‐blue and pure‐green MR‐TADF doped OLEDs. Additionally, the blue emission unit hosted by tricomponent exciplex is combined with an orange‐red TADF emission unit to achieve a double‐emission‐layer blue‐hazard‐free warm white OLED with an EQE max of 30.3% and stable electroluminescence spectra over a wide brightness range.
科研通智能强力驱动
Strongly Powered by AbleSci AI