以1,3-茚二酮为电子受体的热激活延迟荧光分子的合成及其在有机发光二极管中的应用

本文设计合成了一种新型电子受体2,2-二甲基-1,3-茚二酮,并将其应用于热激活延迟荧光(TADF)分子的设计中,合成了一系列具有不同发光性能的TADF分子:5-二甲基吖啶基-2,2-二甲基-1,3-茚二酮(IDYD),5-吩噁嗪基-2,2-二甲基-1,3-茚二酮(IDPXZ)和5,6-二吩噁嗪基-2,2-二甲基-1,3-茚二酮(ID2PXZ)。以IDYD为客体掺杂制备得到蓝光OLED器件,其CIE值为(0.27,0.31),最大外量子效率(EQE)为2.13%。以IDPXZ为客体掺杂得到橙光OLED器件,其CIE值为(0.43,0.53),EQE为1.31%。以ID2PXZ为客体掺杂得到黄光OLED器件,其CIE值为(0.41,0.54),EQE为2.55%。上述结果证明了以2,2-二甲基-1,3-茚二酮为电子受体可以得到不同发光颜色的TADF分子,并在全色OLED器件中具有一定应用前景。

Synthesis and Application in Organic Light Emitting Diodes of Thermally Activated Delayed Fluorescence Molecules Based on 1,3-Indione as Acceptor

Novel electron acceptor 2,2-dimethyl-1,3-dione is synthesized and applied for thermally activated delayed fluorescence (TADF) molecular design.We synthesized a series of TADF molecules based on 2,2-dimethyl-1,3-dione with different emission color:IDYD,IDPXZ and ID2PXZ.The organic light emitting diodes (OLEDs) device based on IDYD exhibits blue emission with CIE coordinate of (0.27,0.31),and the maximum external quantum efficiency (EQE) reaches 2.13％.While the OLEDs device based on IDPXZ exhibits orange emission with CIE coordinate of (0.43,0.53) and the maximum external quantum efficiency (EQE) reaches 1.31％.For the OLEDs device based on ID2PXZ exhibits yellow emission with CIE coordinate of (0.41,0.54),and the maximum external quantum efficiency (EQE) reaches 2.55％.The results show that 2,2-dimethyl-1,3-indenone can be used as an electron acceptor for TADF molecule design and have a decent prospect in full-color OLEDs devices.