首页|基于四配位铂配合物敏化多重共振热激活延迟荧光的窄发射蓝色溶液加工有机发光二极管

基于四配位铂配合物敏化多重共振热激活延迟荧光的窄发射蓝色溶液加工有机发光二极管

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有机发光二极管(OLED)已经在智能手机方面获得了商业应用,由于目前规模生产的OLED采用蒸镀工艺,使其价格居高不下.为此,我们采用溶液加工方法,使用铂配合物作为敏化剂,多重共振热激活延迟荧光材料作为发光分子,实现了高效、高色纯度、低效率滚降的器件开发.磷光敏化剂的引入可使三线态激子高效转化为单线态激子.得益于磷光敏化剂较短的激子寿命,基于溶液加工的蓝色多重共振热激活延迟荧光器件不仅实现了13.2%的外量子效率,而且在1 000 cd/m2亮度下的效率滚降仅为25.8%.为了进一步抑制Dexter能量转移,我们采用具有外围位阻但发光核相同的分子作为客体,可使外量子效率提升至13.6%,并抑制光谱展宽.该研究为设计高色纯度、高效率的溶液加工器件提供了一个通用的策略.
Tetradentate Pt(Ⅱ)Complex Sensitized Multi-resonant Thermally Activated Delayed Fluorescence for Narrow Bandwidth Blue Solution-processed OLEDs
Although organic light-emitting diodes(OLEDs)have been commercialized and become popular in smartphone,the vacuum deposition process makes them too expensive for mass production and less cost-effective.Herein,we employed highly emissive platinum complex as the sensitizer and multi-resonant thermally activated delayed fluorescence(MR-TADF)molecules as the emitters to demonstrate highly efficient,high color purity,and solution-processed OLEDs with the alleviated efficiency roll-offs.The triplet excitons are rapidly converted to singlet excitons assisted by the phosphorescent sensitizer.Attributed to the reduced triplet exciton lifetime induced by the phosphorescent sensitizer,the MR-TADF OLEDs exhibited a maximum external quantum efficiency(EQE)of 13.2%with a low efficiency roll-off of 25.8%at 1 000 cd/m².To reduce Dexter energy transfer between phosphorescence sensitizer and the emitter,an analogue TADF emitter with the peripheral bulky blocking units was employed,which rendered an improved maximum EQE of 13.6%.This investigation presents a general approach to realize high-performance solution-processed electroluminescence.

phosphorescent sensitizernarrow bandwidth,multi-resonancethermally activated delayed fluorescenceorganic light-emitting diodes

李家乐、方辉、龚少龙、谢国华

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武汉大学 化学与分子科学学院,索维奇分子科学中心,湖北 武汉 430072

厦门大学 柔性电子(未来技术)研究院,福建 厦门 361005

磷光敏化 窄光谱 多重共振 热激活延迟荧光 有机发光二极管

国家自然科学基金国家自然科学基金江汉大学光电化学材料与器件教育部重点实验室开放基金国家自然科学基金-瑞典科研与教育国际合作基金会合作交流项目

5237319562175189JDGD-20230152211530052

2024

10.37188/CJL.20240049

发光学报
中国物理学会发光分会,中国科学院长春光学精密机械与物理研究所

发光学报

CSTPCD北大核心
影响因子：1.301
ISSN：1000-7032
年,卷(期)：2024.45(5)