Efficient Deep-Blue Electrofluorescence with an External Quantum Efficiency Beyond 10

Shuanglong Wang; Mengya Qiao; Zhonghua Ye; Dehai Dou; Minyu Chen; Yan Peng; Ying Shi; Xuyong Yang; Lei Cui; Jiuyan Li; Chunju Li; Bin Wei; Wai-Yeung Wong

doi:10.1016/j.isci.2018.10.026

Efficient Deep-Blue Electrofluorescence with an External Quantum Efficiency Beyond 10

iScience. 2018 Nov 30:9:532-541. doi: 10.1016/j.isci.2018.10.026. Epub 2018 Nov 1.

Authors

Shuanglong Wang¹, Mengya Qiao², Zhonghua Ye³, Dehai Dou¹, Minyu Chen¹, Yan Peng¹, Ying Shi³, Xuyong Yang¹, Lei Cui², Jiuyan Li⁴, Chunju Li⁵, Bin Wei⁶, Wai-Yeung Wong⁷

Affiliations

¹ School of Mechatronic Engineering and Automation, Key Laboratory of Advanced Display and System Applications, Ministry of Education, Shanghai University, 149 Yanchang Road, Shanghai, 200072, P. R. China.
² Department of Chemistry, Center for Supramolecular Chemistry and Catalysis, Shanghai University, 99 Shangda Road, Shanghai 200444, P. R. China.
³ School of Materials Science and Engineering, Shanghai University, Shanghai 200444, P. R. China.
⁴ School of Chemical Engineering, Dalian University of Technology, Liaoning 116024, P.R. China.
⁵ Department of Chemistry, Center for Supramolecular Chemistry and Catalysis, Shanghai University, 99 Shangda Road, Shanghai 200444, P. R. China. Electronic address: cjli@shu.edu.cn.
⁶ School of Mechatronic Engineering and Automation, Key Laboratory of Advanced Display and System Applications, Ministry of Education, Shanghai University, 149 Yanchang Road, Shanghai, 200072, P. R. China. Electronic address: bwei@shu.edu.cn.
⁷ Institute of Molecular Functional Materials and Department of Applied Biology and Chemical Technology, Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, P. R. China. Electronic address: wai-yeung.wong@polyu.edu.hk.

Abstract

The design of blue fluorescent materials combining both deep-blue emission (CIE_y<0.06) and high-efficiency climbing over the typically limited exciton production efficiency of 25% is a challenge for organic light-emitting diodes (OLEDs). In this work, we have synthesized two blue luminogens, trans-9,10-bis(2-butoxyphenyl)anthracene (BBPA) and trans-9,10-bis (2,4-dimethoxyphenyl)anthracene with high photoluminescence quantum yields (PLQYs) of 89.5% and 87.0%, respectively. Intriguingly, we have proposed a strategy to avoid aggregation-caused quenching, which can effectively reduce the undesirable excimeric emission by introducing two host matrices with twisted molecular structure, 9,10-di(naphth-2-yl) anthracene and 10,10'-bis-(4-fluorophenyl)-3,3'-dimethyl-9,9'-bianthracene (MBAn-(4)-F), in the BBPA emission layer. The device containing the EML of BBPA-doped MBAn-(4)-F exhibited a high external quantum efficiency of 10.27% for deep-blue emission with the Commission International de L'Eclairage CIE coordinates of (0.15, 0.05) via the steric effect. Importantly, this represents an advance in deep-blue-emitting fluorescent OLED architectures and materials that meet the requirements of high-definition display.

Keywords: Materials Science; Optical Materials; Polymers.