高等学校化学学报

高等学校化学学报

• 研究论文 • 上一篇    下一篇

基于菲并[9,10]咪唑衍生物的深蓝光热激子材料，其CIEy<0.04

Ge Shuyuan,Feng Zijun,Cheng Zhuang,Liu Futong,Lu Ping   

  1. 吉林大学超分子结构与材料国家重点实验
  • 收稿日期:2025-12-29 修回日期:2026-01-18 网络首发:2026-01-21 发布日期:2026-01-21
  • 通讯作者: Lu Ping E-mail:lup@jlu.edu.cn
  • 基金资助:
    国家自然科学基金（批准号：22375072）和长春市科技项目（批准号：23JQ05）资助

Deep-blue hot exciton material based on phenanthro[9,10]imidazole derivative with CIEy < 0.04

GE Shuyuan#, FENG Zijun#, CHENG Zhuang, LIU Futong，LU Ping*   

  1. State Key Laboratory of Supramolecular Structure and Materials, Department of Chemistry, Jilin University
  • Received:2025-12-29 Revised:2026-01-18 Online First:2026-01-21 Published:2026-01-21
  • Supported by:

    Supported by the National Natural Science Foundation of China (22375072) and Changchun Science and Technology Bureau (23JQ05)

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补充材料

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摘要： 满足国际电信联盟（ITU）BT.2020标准的高性能深蓝光材料及发光器件目前仍然非常有限。本工作将甲基取代的联苯基团接到经典的热激子基团—菲并咪唑上，设计并合成了四种深蓝光发光材料：PP1M、PP2M、PP3M和PP4M。甲基的引入增大了分子的扭转角，从而拓宽了四种化合物的能隙。通过对不同取代位点的调控，PP3M在非掺薄膜中实现了85.3%的荧光量子产率。基于PP3M的掺杂器件表现出深蓝光发射，其外量子效率为7.2%，且具有较小的效率滚降。该器件的半峰宽仅为53 nm，CIE坐标为(0.16, 0.04)，符合BT.2020标准的要求。研究结果显示器件中高的激子利用率主要源于热激子机制。本研究为开发兼具高发光效率与优异色纯度的高性能深蓝光OLED材料提供了可行的分子设计思路。

关键词: 有机发光二极管, 深蓝光, 杂化局域-电荷转移激发态, 外量子效率, 菲并[9,10]咪唑

Abstract: High-performance deep-blue emitters that meet the BT. 2020 standard proposed by the International Telecommunication Union (ITU) for organic light-emitting diodes (OLEDs) remain highly limited. In this work, four deep-blue emitters, PP1M, PP2M, PP3M, and PP4M, are designed and synthesized by connecting methyl-substituted biphenyl groups with classical hot exciton building block of phenanthreneimidazole. The introduction of methyl groups contributes to increase the molecular torsion angle and widen the energy gaps for the four compounds. Through appropriate modulation of substitution site, PP3M achieves the highest photoluminescence quantum yield of 85.3% in neat film. As a result, the PP3M-based device exhibits deep-blue light with external quantum efficiency of 7.2% and suppressed efficiency roll-off. The device also shows a small full width at half maximum of 53 nm and the CIE coordinates locate at (0.16, 0.04), meeting well with the BT. 2020 standard. The high exciton utilization efficiency is primarily ascribed to the hot exciton pathway. This study provides a reliable insight for the design of efficient deep-blue OLEDs with high color purity.

Key words: Organic light-emitting diodes; Deep-blue; Hybridized local and charge transfer, External quantum efficiency, Phenanthro[9,10]imidazole

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