材料科学
电致发光
量子效率
有机发光二极管
光电子学
兴奋剂
半最大全宽
激子
猝灭(荧光)
共发射极
荧光
二极管
掺杂剂
光学
纳米技术
物理
量子力学
图层(电子)
作者
Pengcheng Jiang,Jingsheng Miao,Xiaosong Cao,Xia Han,Ke Pan,Tao Hua,Xialei Lv,Zhongyan Huang,Yang Zou,Chuluo Yang
标识
DOI:10.1002/adma.202106954
摘要
Multiresonance thermally activated delayed fluorescence (MR-TADF) emitters manifest great potential for organic light-emitting diodes (OLEDs) due to their high exciton-utilization efficiency and narrowband emission. Nonetheless, their tendency toward self-quenching caused by strong interchromophore interactions would induce doping sensitivity and deteriorate the device performances, and effective strategy to construct quenching-resistant emitters without sacrifycing color purity is still to be developed. By segregating the planar MR-TADF skeleton using two bulky carbazolyl units, herein a highly emissive molecule with enhanced quenching resistance is reported. The steric effect largely removes the formation of detrimental excimers/aggregates, and boosts the performance of the corresponding devices with a maximum external quantum efficiency (EQEmax ) up to 40.0% and full width at half maximum (FWHM) of 25 nm, representative of the only example of single OLED that can concurrently achieve narrow bandwidth and high EL efficiency surpassing 40% to date. Even at doping ratio of 30 wt%, the EQEmax is retained to be 33.3% with nearly unchanged emission spectrum. This work provides a viable approach to realize doping-insensitive MR-TADF devices with extreme EL efficiency and color purity for high-end OLED displays.
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