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Spirobi[dibenzo[b,e][1,4]azasiline]: A Novel Platform for Host Material in Highly Efficient Organic Light-Emitting Diodes

Article excerpt is from:Xiang-Yang Liu, Xun Tang, Yue Zhao, Danli Zhao, Jian Fan, Liang-Sheng Liao
J. Mater. Chem. C, 2018 in press

A novel spiro-type material (5H,5'H-10,10'-spirobi[dibenzo[b,e][1,4]azasiline]-5,5'-diyl)bis((4-methoxyphenyl)-methanone) (SDBSO) was designed and synthesized. The introduction of spirobi[dibenzo[b,e][1,4]azasiline] makes the material retain high triplet energy over 3.10 eV. In addition, thanks to the highly steric and rigid structure and spiro-linkage, SDBSO exhibited good thermal stability and suitable frontier molecular orbital (FMO) energy levels. The RGB (blue, green, and red) three-color phosphorescent organic light-emitting diodes with SDBSO as the host material were fabricated and the maximum external quantum efficiencies were achieved over 20% for green and red devices with relative flat roll-off, indicating its potential utility as a host-building block for highly efficient PHOLEDs.