摘要
Thick-layer organic light-emitting diodes(OLEDs)comprising a single thick film to simultaneously transport carriers and emit light offer significant advantages in simplifying the fabrication process and enhancing operational stability.However,achieving highly efficient thick-layer non-doped OLEDs requires emitters possessing balanced bipolar carrier transport,strong solid-state emission and high exciton utilization,which impose high requirements on designing luminescent materials.In this work,two representative bipolar aggregation-induced delayed fluorescence(AIDF)emitters are employed to fabricate such thick-layer non-doped devices.Excellent electroluminescence(EL)performances are attained with low turn-on voltages(2.5 V),high external quantum efficiencies(19.8%),and negligible efficiency roll-off at high luminance.Furthermore,the operational lifetime of the thick-layer device increases by more than twofold compared to that of the thin-layer devices.In addition,highefficiency,high-color-purity simplified thick-layer hyperfluorescence OLEDs are also achieved by using their thick neat films as sensitizers for multi-resonance emitters.These results indicate that the bipolar AIDF emitters are promising candidates for constructing simple thick-layer OLEDs,which provides a feasible strategy for developing highly efficient and stable OLEDs.
厚膜有机发光二极管(OLED)是由一层厚膜同时行使载流子传输与发光功能的器件,在简化制备工艺和提升工作稳定性方面优势显著.然而,要获得高效的非掺杂厚膜OLED器件,发光材料必须兼具平衡的双极载流子传输特性,高固态发光效率和高激子利用率,对发光材料的设计提出了更高的要求.本研究选取2个代表性的双极聚集诱导延迟荧光(AIDF)材料应用于此类器件的制备.基于这些材料制备的厚膜器件表现出优异的电致发光性能,具有启亮电压低(约2.5 V),外量子效率高(达19.8%),以及高亮度下效率滚降非常低等优点.此外,厚膜器件的工作寿命比薄膜器件提升了2倍以上.这些厚膜还可以敏化窄光谱多重共振发光材料来制备高效率、高色纯度、结构简化的厚膜超荧光OLED器件.以上结果表明,该双极AIDF材料是制备简易厚膜OLED器件的有潜力的候选材料.本研究为开发高效稳定的OLED器件提供了一个新策略.
出处
《高等学校化学学报》
2026年第5期254-267,共14页
Chemical Journal of Chinese Universities
基金
国家自然科学基金(批准号:U23A20594,2375066)
广东省基础与应用基础研究基金项目(批准号:2023B1515040003)
华南理工大学发光材料与器件全国重点实验室基金(批准号:Skllmd-2024-06)资助.
