Department of Chemistry, State Key Laboratory of Supramolecular Structure and Materials, Jilin University, 2699 Qianjin Avenue, Changchun, 130012, P. R. China.
Chem Asian J. 2019 Apr 1;14(7):1004-1012. doi: 10.1002/asia.201801867. Epub 2019 Feb 20.
The development of efficient blue materials has been a continuous research topic in the field of organic light-emitting diodes (OLEDs). In this paper, three aggregation-induced emission enhancement active blue emitters, PIAnTPE, TPAAnTPE and CzAnTPE, are successfully synthesized by attaching a triphenylethylene unit and phenanthroimidazole/triphenylamine/carbazole moieties to the 9,10-positions of anthracene, respectively. The three compounds exhibit good thermal stabilities, appropriate for the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) energy levels and display high photoluminescence quantum yields (PLQYs) of 65, 70 and 46 % in the solid state. Non-doped blue devices using PIAnTPE, TPAAnTPE and CzAnTPE as the emitting layers show good electroluminescent performances, with the maximum external quantum efficiencies (EQEs) of 4.46, 4.13 and 4.04 %, respectively. More importantly, EQEs of all the three devices can be still retained when the luminescence reaches 1000 cd m , exhibiting quite small efficiency roll-offs in the non-doped OLEDs.
高效蓝色材料的开发一直是有机发光二极管（OLEDs）领域的一个持续研究课题。在本文中，通过将三苯乙烯单元和菲咯啉/三苯胺/咔唑部分分别连接到蒽的 9,10-位，成功合成了三种聚集诱导发光增强的活性蓝色发光体 PIAnTPE、TPAAnTPE 和 CzAnTPE。这三种化合物表现出良好的热稳定性，适合最高占据分子轨道（HOMO）和最低未占据分子轨道（LUMO）能级，在固态下显示出 65%、70%和 46%的高光致发光量子产率（PLQY）。使用 PIAnTPE、TPAAnTPE 和 CzAnTPE 作为发射层的非掺杂蓝色器件表现出良好的电致发光性能，最大外量子效率（EQE）分别为 4.46%、4.13%和 4.04%。更重要的是，当发光达到 1000 cd/m 时，所有三种器件的 EQE 仍能保持，在非掺杂 OLED 中表现出相当小的效率滚降。
