Ternary donor–acceptor phosphine oxide hosts with peculiar high energy gap for efficient blue electroluminescence

Mingzhi Sun; Liping Zhu; Wenjing Kan; Ying Wei; Dongge Ma; Xuefeng Fan; Wei Huang; Hui Xu

doi:10.1039/C5TC02029H

Ternary donor–acceptor phosphine oxide hosts with peculiar high energy gap for efficient blue electroluminescence†

Mingzhi Sun,^a Liping Zhu,^b Wenjing Kan,^a Ying Wei,^ac Dongge Ma,*^b Xuefeng Fan,^b Wei Huang*^c and Hui Xu*^ac

* Corresponding authors

^a Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials, Heilongjiang University, 74 Xuefu Road, Harbin 150080, P. R. China
E-mail: hxu@hlju.edu.cn, iamhxu@njtech.edu.cn

^b State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 People Street, Changchun 130022, P. R. China
E-mail: mdg1014@ciac.jl.cn

^c Institute of Advanced Materials, Nanjing Tech University (Nanjing Tech), 30 South Puzhu Road, Nanjing 211800, P. R. China
E-mail: wei-huang@njtech.edu.cn

Abstract

Ternary donor (D)–acceptor (A)–acceptor (A) molecules are commonly considered as low triplet (T₁) energy systems for specific applications. In this work, exception to this behavior was observed in a triangle-shaped D–A–A molecule PCImbPO with unusually high triplet energy of 3.0 eV. Profiting from the enhanced D–A electronic coupling, electron injecting and transporting ability of PCImbPO was dramatically improved with negligible influences on its highest occupied molecular orbital (HOMO) characteristics. Its particular T₁ configuration adjustment further gives rise to the separated frontier MO and T₁ locations, beneficial to suppress quenching effects. By utilizing PCImbPO as host in blue phosphorescent organic light-emitting diodes (PHOLEDs) and thermally activated delayed fluorescence devices, impressively high external quantum efficiency of 22% and 12% were achieved, respectively. This work established a new understanding of high-energy-gap complicated D–A systems.

This article is part of the themed collection: 2015 Journal of Materials Chemistry C Hot Papers

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DOI: https://doi.org/10.1039/C5TC02029H
Article type: Paper
Submitted: 06 Jul 2015
Accepted: 31 Jul 2015
First published: 31 Jul 2015

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J. Mater. Chem. C, 2015,3, 9469-9478

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Ternary donor–acceptor phosphine oxide hosts with peculiar high energy gap for efficient blue electroluminescence

M. Sun, L. Zhu, W. Kan, Y. Wei, D. Ma, X. Fan, W. Huang and H. Xu, J. Mater. Chem. C, 2015, 3, 9469 DOI: 10.1039/C5TC02029H

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Journal of Materials Chemistry C

Ternary donor–acceptor phosphine oxide hosts with peculiar high energy gap for efficient blue electroluminescence†

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