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

李家乐; 方辉; 龚少龙; 谢国华

doi:10.37188/CJL.20240049

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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

封面文章 | 更新时间：2024-07-10

- 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
  增强出版
- Tetradentate Pt(Ⅱ) Complex Sensitized Multi-resonant Thermally Activated Delayed Fluorescence for Narrow Bandwidth Blue Solution-processed OLEDs
- 发光学报 2024年45卷第5期页码：699-710
- 作者机构：
  
  1.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
  2.厦门大学柔性电子(未来技术)研究院, 福建厦门 361005
- 作者简介：
  
  [ "龚少龙（1984-），男，湖北汉川人，博士，教授，博士生导师，2012年于武汉大学获得博士学位，主要从事新型（金属）有机发光材料的设计合成、结构与性能及其光电应用的研究。E-mail： slgong@whu. edu. cn" ]
  [ "谢国华（1982-），男，福建漳州人，博士，教授，博士生导师，2011年于吉林大学获得博士学位，主要从事有机光电材料与器件的研究。E-mail： ifeghxie@xmu. edu. cn" ]
- 基金信息：
  
  National Natural Science Foundation of China(52373195;62175189);Opening Project of Key Laboratory of Optoelectronic Chemical Materials and Devices, Ministry of Education, Jianghan University(JDGD-202301);Joint China-Sweden Mobility Program(52211530052)
- DOI：10.37188/CJL.20240049
  中图分类号： O482.31
- 纸质出版日期：2024-05-25，
  
  收稿日期：2024-02-28，
  
  修回日期：2024-03-07，
- 稿件说明：
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李家乐,方辉,龚少龙等.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[J].发光学报,2024,45(05):699-710.

LI Jiale,FANG Hui,GONG Shaolong,et al.Tetradentate Pt(Ⅱ) Complex Sensitized Multi-resonant Thermally Activated Delayed Fluorescence for Narrow Bandwidth Blue Solution-processed OLEDs[J].Chinese Journal of Luminescence,2024,45(05):699-710.
李家乐,方辉,龚少龙等.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[J].发光学报,2024,45(05):699-710. DOI： 10.37188/CJL.20240049.

LI Jiale,FANG Hui,GONG Shaolong,et al.Tetradentate Pt(Ⅱ) Complex Sensitized Multi-resonant Thermally Activated Delayed Fluorescence for Narrow Bandwidth Blue Solution-processed OLEDs[J].Chinese Journal of Luminescence,2024,45(05):699-710. DOI： 10.37188/CJL.20240049.

摘要

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/m

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。

Abstract

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.

关键词

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

Keywords

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

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