Pure Hydrocarbon Hosts for ≈100% Exciton Harvesting in Both Phosphorescent and Fluorescent Light-Emitting Devices

• Published in: Advanced materials (Weinheim) Vol. 27; no. 28; pp. 4213 - 4217
• Main Authors: Cui, Lin-Song, Xie, Yue-Min, Wang, Ya-Kun, Zhong, Cheng, Deng, Ya-Li, Liu, Xiang-Yang, Jiang, Zuo-Quan, Liao, Liang-Sheng
• Format: Journal Article
• Language: English
• Published: Germany Blackwell Publishing Ltd 01.07.2015
• Subjects: lifetime; organic light-emitting diodes (OLEDs); phosphorescence; pure hydrocarbon hosts; thermally activated delayed fluorescence (TADF); lifetime; organic light-emitting diodes (OLEDs); phosphorescence; thermally activated delayed fluorescence (TADF); pure hydrocarbon hosts
• ISSN: 0935-9648; 1521-4095; 1521-4095
• DOI: 10.1002/adma.201501376

Two novel pure hydrocarbon compounds, SF33 and SF34, are designed with high triplet energies and stabilities. The efficiency of an SF34/FIrpic‐based device is as high as 22.0%. Moreover, SF33 and SF34 are also used as hosts for thermally activated delayed fluorescence organic light‐emitting diodes and achieve external quantum efficiencies in excess of 20.8% and 22.3%, respectively. The pure hydrocarbon host shows a much longer device lifetime than the traditional host 4,4′‐di(N‐carbazolyl)biphenyl.