High-performance Deep Blue “Hot Exciton” Materials Based on Anthracene

XU Lei; YU Yue; PAN Yuyu; WANG Bohan; YING Lei; MA Yuguang

doi:10.37188/CJL.20230137

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High-performance Deep Blue “Hot Exciton” Materials Based on Anthracene

Invited Paper | 更新时间：2023-08-02

- High-performance Deep Blue “Hot Exciton” Materials Based on Anthracene
  增强出版
- Chinese Journal of Luminescence Vol. 44, Issue 7, Pages: 1300-1307(2023)
- 作者机构：
  
  1.华南理工大学发光材料与器件国家重点实验室，广东广州　510640
  2.东莞伏安光电科技有限公司，广东广州　510006
  3.沈阳工业大学石油化工学院，辽宁辽阳　111003
- 作者简介：
- 基金信息：
  
  National Key R&D Program of China(2020YFA0714604);National Natural Science Foundation of China(U20A6002;91833304;51521002);Basic and Applied Basic Research Major Program of Guangdong Province(2019B030302007);Research and Development Funds for Science and Technology Program of Guangzhou(202007020004);Natural Science Foundation of Guangdong Province(2019B121205002);Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates(2019B030301003)
- DOI：10.37188/CJL.20230137
  CLC： O482.31
- Published：05 July 2023，
  
  Received：26 May 2023，
  
  Revised：10 June 2023，
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许雷,俞越,潘玉钰等.基于蒽核的高性能深蓝光“热激子”材料[J].发光学报,2023,44(07):1300-1307.

XU Lei,YU Yue,PAN Yuyu,et al.High-performance Deep Blue “Hot Exciton” Materials Based on Anthracene[J].Chinese Journal of Luminescence,2023,44(07):1300-1307.
许雷,俞越,潘玉钰等.基于蒽核的高性能深蓝光“热激子”材料[J].发光学报,2023,44(07):1300-1307. DOI： 10.37188/CJL.20230137.

XU Lei,YU Yue,PAN Yuyu,et al.High-performance Deep Blue “Hot Exciton” Materials Based on Anthracene[J].Chinese Journal of Luminescence,2023,44(07):1300-1307. DOI： 10.37188/CJL.20230137.

摘要

蓝光OLED材料是电致发光领域的关键和难点。基于高能激发态转换的“热激子”材料表现出优异蓝光材料的潜能。本文通过调节给受体的推拉电子能力，以蒽为核心构筑单元、三苯基苯为弱给体、苯氰基为受体，设计合成了一种新型D⁃π⁃A结构分子TACN。扭曲的三苯基苯提供了高度扭曲的分子构象，有效减弱了聚集态下的猝灭效应，因此TACN表现出高的荧光量子产率（聚集态下47%）。实验结果和理论分析表明，TACN具备“热激子”特征，其大的T

⁃T

能隙（1.45 eV）有效阻碍了从T

到T

的内转换（IC）过程，而小的T

⁃S

能差（0.18 eV，T

）有利于促进反向系间窜越（RISC）过程。基于TACN的非掺杂器件表现出深蓝色发射（

max

= 444 nm），半峰宽（FWHM）为59 nm，色坐标为（0.17，0.13）。其最大外量子效率（EQE

max

）为8.3%，相应的激子利用率（EUE）最高为88.7%。

Abstract

The blue OLED material plays a vital role in the field of electroluminescence. Based on high-energy excited state transition， the “hot exciton” materials show the potential of excellent blue light emitting. We designed and synthesized a novel D-π-A structure molecule TACN using anthracene as the core building unit， triphenylbenzene as the weak donor and phenylcyanogen as the acceptor by adjusting the ability of pushing and pulling electrons. Distorted triphenylbenzene provides a highly distorted molecular conformation， which effectively attenuates the quenching effect in the aggregated state. Therefore， TACN exhibits a high fluorescence quantum yield （47% in the aggregated state）. The experimental results and theoretical analysis show that TACN has the “hot exciton” characteristic， and its large T

-T

gap （1.45 eV） effectively hinders the internal conversion （IC） process from T

to T

， while its small T

-S

energy difference （0.18 eV， T

） facilitates the reverse intersystem crossing （RISC） process. Non-doped devices based on TACN exhibit dark blue emission （

max

= 444 nm）， full width at half maximum （FWHM） of 59 nm， and color coordinates of （0.17， 0.13）. Its maximum external quantum efficiency （EQE

max

） is 8.3% and corresponding exciton utilization （EUE） is up to 88.7%.

关键词

有机发光二极管热激子蓝光材料蒽反向系间窜越

Keywords

organic light emitting diodeshot excitonblue emitteranthracenereverse intersystem crossing

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