高等学校化学学报 ›› 2022, Vol. 43 ›› Issue (11): 20220371.doi: 10.7503/cjcu20220371

• 有机化学 • 上一篇    下一篇

甲基修饰的咔唑/二苯砜基AIE-TADF蓝光材料及其OLED器件

伍泽鑫1, 朱渊杰1, 王泓中1, 王均安2, 贺英1()   

  1. 1.上海大学材料科学与工程学院高分子材料系, 上海 200444
    2.上海大学材料科学与工程学院材料研究所, 上海 200072
  • 收稿日期:2022-05-24 出版日期:2022-11-10 发布日期:2022-06-14
  • 通讯作者: 贺英 E-mail:yinghe@staff.shu.edu.cn
  • 基金资助:
    国家教育部科学基金(18JDGC025)

Methyl-modified Carbazole/Diphenyl Sulfone-based AIE-TADF Blue Emitter and Its OLEDs

WU Zexin1, ZHU Yuanjie1, WANG Hongzhong1, WANG Junan2, HE Ying1()   

  1. 1.Department of Polymer Materials,School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China
    2.Institute of Materials,School of Materials Science and Engineering,Shanghai University,Shanghai 200072,China
  • Received:2022-05-24 Online:2022-11-10 Published:2022-06-14
  • Contact: HE Ying E-mail:yinghe@staff.shu.edu.cn
  • Supported by:
    the Research Projects of Ministry of Education of China(18JDGC025)

摘要:

以四甲基咔唑为电子给体(D)、 二苯砜为电子受体(A)构建了具有D-A-D结构的纯有机咔唑/二苯砜衍生物——9,9'-[磺酰基双(3,1-亚苯基)]双(1,3,6,8-四甲基-9H-咔唑)(TMe-mSOCz). 对所合成材料的光物理性能研究表明, TMe-mSOCz表现出明显的聚集诱导发射(AIE)和热激活延迟荧光(TADF), 延迟寿命和延迟荧光占比分别为2.26 μs和47.7%, 并具有良好的电化学稳定性和热稳定性. 基于TMe-mSOCz作为非掺杂发光层制备了有机发光二极管(OLED)器件, 其启亮电压(Von)为3.5 V, 最大外量子效率为5.63%, 国际照明委员会(CIE)坐标为(0.18, 0.26). 在1000 cd/m2亮度下, 非掺杂器件的效率滚降非常小(7.1%), 色彩稳定性较好, 其具有窄的半峰宽(FWHM=72 nm). 研究结果表明, 在传统TADF分子给受体间引入甲基修饰有利于开发具有AIE特性与更高效的D-A-D型TADF分子, 这为基于AIE-TADF分子开发新型OLED器件提供了新途径.

关键词: 热激活延迟荧光, 聚集诱导发射, 咔唑基二苯砜衍生物, 有机发光二极管, 非掺杂器件

Abstract:

A pure organic carbazole/diphenyl sulfone derivative with D-A-D structure, 9,9'-[sulfonylbis(3,1-phenylene)]bis(1,3,6,8-tetramethyl-9H-carbazole)(TMe-mSOCz), was constructed using tetramethyl carbazole as electron donor(D) and diphenyl sulfone as electron acceptor(A). The photophysical properties of the synthesized materials showed that TMe-mSOCz exhibited obvious aggregation-induced emission(AIE) and thermally activated delayed fluorescence(TADF), with delayed lifetime and delayed fluorescence accounting for 2.26 μs and 47.7%, respectively, and good thermal and electrochemical stabilities. The organic light emitting diodes(OLEDs) fabricated based on TMe-mSOCz as the non-doped light-emitting layer exhibits a turn-on voltage(Von) of 3.5 V, the maximum external quantum efficiency of 5.63%, and the International Commission on Illumination(CIE) coordinates of (0.18, 0.26). At 1000 cd/m2 brightness, the non-doped OLED device possesses a very low(7.1%) efficiency roll-off, good color stability, and a narrow full width at half maxima(FWHM) of 72 nm. The research results showed that the introduction of methyl modification between the receptors of traditional TADF molecules was beneficial to the development of D-A-D type TADF molecules with AIE characteristics and higher efficiency, which supplied a new route to OLED emitter fabrication based on AIE-TADF molecules.

Key words: Thermally activated delayed fluorescence, Aggregation-induced emission, Carbazolyl diphenyl sulfone derivative, Organic light emitting diode, Non-doped device

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