高等学校化学学报 ›› 2023, Vol. 44 ›› Issue (12): 20230274.doi: 10.7503/cjcu20230274

• 有机化学 • 上一篇    下一篇

基于四氰基受体单元的高效近红外热激活延迟荧光

王霄靖, 刘艺霞, 李阳, 杨陈宗, 冯敏强(), 樊健()   

  1. 苏州大学功能纳米与软材料研究院, 江苏省碳基功能材料与器件重点实验室, 苏州 215123
  • 收稿日期:2023-06-09 出版日期:2023-12-10 发布日期:2023-08-23
  • 通讯作者: 冯敏强 E-mail:mkfung@suda.edu.cn;jianfan@suda.edu.cn
  • 作者简介:樊 健, 男, 博士, 教授, 主要从事有机光电材料理论与实验方面的研究. E-mail: jianfan@suda.edu.cn
    第一联系人:共同第一作者.
  • 基金资助:
    国家自然科学基金(21871199)

High-efficiency Near-infrared Thermally Activated Delayed Fluorescence Based on Tetracyano Acceptor

WANG Xiaojing, LIU Yixia, LI Yang, YANG Chenzong, FUNG Mankeung(), FAN Jian()   

  1. Jiangsu Key Laboratory for Carbon?Based Functional Materials & Devices,Institute of Functional Nano & Soft Materials,Soochow University,Suzhou 215123,China
  • Received:2023-06-09 Online:2023-12-10 Published:2023-08-23
  • Contact: FUNG Mankeung E-mail:mkfung@suda.edu.cn;jianfan@suda.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(21871199)

摘要:

以二吡啶并吩嗪为受体单元, 三苯胺(TPA)为给体单元, 设计合成了近红外(NIR)热激活延迟荧光(TADF)材料11,12-双[4-(二苯基氨基)苯基]联吡啶[3,2-a:2',3'-c]吩嗪-3,6,10,13-四甲腈(FCNPZ-TPA). 在FCNPZ-TPA分子的受体单元上引入4个氰基增加了受体单元的吸电子能力. 考虑到TPA具有优异的给电子能力, 将强给体-强受体单元同时引入分子骨架中, 使得FCNPZ-TPA的发射波长红移到近红外区域. 另外, 给体(D)和受体(A)单元之间空间位阻导致FCNPZ-TPA具有扭曲D-A分子构型, 从而实现了较小的单线态-三线态能级差(ΔEST). 得益于FCNPZ-TPA分子刚性骨架以及较小的ΔEST, 当FCNPZ-TPA掺杂在主体4,4'-二(9-咔唑)联苯中时, 该有机支光二极管器件在发射波长为742 nm处实现了8.01%的最大外量子效率(EQE).

关键词: 热激活延迟荧光, 近红外, 单线态-三线态能级差, 外量子效率

Abstract:

The near-infrared thermally activated delayed fluorescence(TADF) material 11,12-bis[4-(diphenyla- min)phenyl]dipyrido[3,2-a:2',3'-c]phenazine-3,6,10,13-tetracarbonitrile(FCNPZ-TPA) was designed and synthesized with dipyridinophenazine as the acceptor unit and triphenylamine(TPA) as the donor unit. The introduction of four cyano groups into the acceptor unit increased its electron-withdrawing strength. Considering that tripheny-lamine is a strong electron-donating group, we successfully pushed the emission of FCNPZ-TPA into Near Infra(NIR) region via the incorporation of strong donor and strong acceptor. The steric hindrance between donor(D) and acceptor(A) led to a twisted D-A molecular configuration of FCNPZ-TPA, and thus achieving a small singlet-triplet energy gap(ΔEST). Due to the rigid molecular skeleton and small ΔEST, FCNPZ-TPA based organic light-emitting diode(OLED) exhibited a state-of-the-art maximum external quantum efficiency(EQE) of 8.01% at 742 nm when doped in the 4,4'-bis(N-carbazolyl)-1,1'-biphenyl.

Key words: Thermally activated delayed fluorescence, Near-infrared, Singlet-triplet energy gap, External quantum efficiency

中图分类号: 

TrendMD: