基于激发态分子内质子转移橙光热激子材料的OLED器件及性质研究

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关键词：有机电致发光二极管；激发态分子内质子转移；热激子；反向系间窜越中图分类号：0482.31 文献标识码：ADOI：10.37188/CJL.20250164 CSTR：32170.14.CJL.20250164

Abstract：Anorange-emiting excited-state intramolecular proton transfer （ESIPT）fluorophore，HBT-TPA has beendeveloped，exhibitinghot excitoncharacter.Thismaterial utilizes2-（ 2′ -hydroxyphenyl）benzothiazole（HBT） as the ESIPTunit，modified with the strong electron-donating group of triphenylamine，enabling the emiter some chargetransfercharacteristics.Thisresults intheexcited statesofitsenolandketo isomersboth exhibiting hybridized local and charge transfer（HLCT）characters.TheOLED based on the HBT-TPAemiter presented prominent orange emission，withits electroluminescent（EL）spectrum peaking at 576 nm，corrsponding to Commission Internationalede1Eclairage（CIE）coordinatesof（0.5007±0.0016，0.4883±0.0008）．The device achieved a maximum external quantum efficiency（EQE）and current efficiency（CE）of 2. 0% and 5.0cd/A ，respectively. Notably，the exciton utilization efficiency of the device reaches29.3 3% -43.9%，owing to hot exciton mechanism via highlying reverse intersystem crossing（hRISC） in theketo tautomer of HBT-TPA.

KeyWords：organiclight-emitingdiodes；excited-state intramolecularprotontransfer;hotexciton；reverseintersystem crossing

1引言

有机发光二极管（Organiclight-emittingdi-ode，OLED）由于成本低、自发光、高对比度、快速响应、视角宽、质量轻、柔性和可大面积加工等优点，在显示和照明领域展现出巨大潜力，并逐渐应用于智能手机、电视、可穿戴设备等电子产品中。（剩余16110字）