Synthesis and characterization of diphenylamine derivative containing malononitrile for thermally activated delayed fluorescent emitter
作者:Sunyoung Sohn、Bong Hyun Koh、Jae Yeul Baek、Hyun Chan Byun、Jae Hyun Lee、Dong-Seon Shin、Hyungju Ahn、Han-Koo Lee、Jaeyoung Hwang、Sungjune Jung、Yun-Hi Kim
DOI:10.1016/j.dyepig.2017.01.010
日期:2017.5
To increase the efficiency of blue organic light-emitting diodes (OLEDs), new blue dopants, 2-(bis(4-(diphenylamino)phenyl)methylene)malononitrile (4-DPM) and 2-(bis(3-(diphenylamino)phenyl) methylene)malononitrile (3-DPM), with thermally activated delayed fluorescence were synthesized. 4-DPM with a p-phenyl linker between the electron-donating diphenylamine unit and the electron-withdrawing malonitrile
为了提高蓝色有机发光二极管(OLED)的效率,新型蓝色掺杂剂分别是2-(双(4-(二(二苯氨基)苯基)亚甲基)丙二腈)(4-DPM)和2-(双(3-(二苯胺))合成了具有热激活的延迟荧光的苯基)亚甲基)丙二腈(3-DPM)。4-DPM与p的供电子性二苯胺单元和所述吸电子丙二腈单元之间-苯基接头显示该苯基连接基以及所述丙二腈单元大的重叠,而3-DPM与米-苯基接头在苯基接头中显示出弱的重叠。与4-DPM掺杂剂(1.38 cd / A和0.70 lm / W)相比,具有3-DPM掺杂剂的OLED的效率更高,为12.62 cd / A和8.81 lm / W。该结果归因于给电子单元和吸电子单元之间的重叠小,在0.1 eV以下分裂的小电荷转移单重态-三重态和在水平方向上排列良好的结构(由掠入射X决定)射线衍射。