Asymmetric design of bipolar host materials with novel 1,2,4-oxadiazole unit in blue phosphorescent device

Qian Li; Lin-Song Cui; Cheng Zhong; Zuo-Quan Jiang; Liang-Sheng Liao

doi:10.1021/ol5002494

Asymmetric design of bipolar host materials with novel 1,2,4-oxadiazole unit in blue phosphorescent device

Org Lett. 2014 Mar 21;16(6):1622-5. doi: 10.1021/ol5002494. Epub 2014 Mar 3.

Authors

Qian Li¹, Lin-Song Cui, Cheng Zhong, Zuo-Quan Jiang, Liang-Sheng Liao

Affiliation

¹ Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM) & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University , Suzhou 215123, P.R. China.

PMID: 24588625
DOI: 10.1021/ol5002494

Abstract

The intrinsic asymmetry of 1,2,4-oxadiazole was utilized to synthesize three isomers, DCzmOXD-1, DCzmOXD-2, and mCzmOXD, and high triplet energies over 2.80 eV made them good candidates for host materials in blue OLEDs. The best efficiencies of 23.0 cd A(-1)/20.5 lm W(1-)/11.2% in CE/PE/EQE were achieved by DCzmOXD-1 with derivation at the β-carbon position of 1,2,4-oxadiazole.