Temperature and Exciton Concentration Induced Excimer Emission of 4,4'-Bis(4''-Triphenylsilyl) Phenyl-1,1'-Binaphthalene and Application for Sunlight-Like White Organic Light-Emitting Diodes

Tao Xu; Weiling Li; Xicun Gao; Chang Sun; Guo Chen; Xiaowen Zhang; Chunya Li; Wenqing Zhu; Bin Wei

doi:10.1186/s11671-016-1578-3

Temperature and Exciton Concentration Induced Excimer Emission of 4,4'-Bis(4''-Triphenylsilyl) Phenyl-1,1'-Binaphthalene and Application for Sunlight-Like White Organic Light-Emitting Diodes

Nanoscale Res Lett. 2016 Dec;11(1):379. doi: 10.1186/s11671-016-1578-3. Epub 2016 Aug 25.

Authors

Tao Xu^{1

2}, Weiling Li¹, Xicun Gao³, Chang Sun⁴, Guo Chen¹, Xiaowen Zhang⁵, Chunya Li¹, Wenqing Zhu¹, Bin Wei⁶

Affiliations

¹ Key Laboratory of Advanced Display and System Applications, Ministry of Education, Shanghai University, 149 Yanchang Road, Shanghai, 200072, People's Republic of China.
² Sino-European School of Technology, Shanghai University, 99 Shangda Road, Shanghai, 200444, People's Republic of China.
³ School of Petroleum and chemical engineering, Qinzhou University, 12 coastal Avenue, Qinzhou, 535000, People's Republic of China. gaoxicun1@hotmail.com.
⁴ Department of Electrical Engineering, Iowa State University, 4565 Union Dr, Ames, IA, 50011, USA.
⁵ School of Mechanical & Electrical Engineering, Guilin University of Electronic Technology, 1 Jinji Road, Guilin, 541004, People's Republic of China.
⁶ Key Laboratory of Advanced Display and System Applications, Ministry of Education, Shanghai University, 149 Yanchang Road, Shanghai, 200072, People's Republic of China. bwei@shu.edu.cn.

Abstract

This paper demonstrates the influence of temperature, exciton concentration, and electron transportation layers on the excimer emission of a novel deep-blue material: 4,4'-bis(4''-triphenylsilyl) phenyl-1,1'-binaphthalene (SiBN), by studying the photoluminescence and electroluminescence spectra of SiBN-based film. We have further developed sunlight-like and warm-light white organic light-emitting diodes (WOLEDs) with high efficiency and wide-range spectra, using SiBN and bis(2-phenylbenzothiozolato-N,C2')iridium(acetylacetonate) (bt2Ir(acac)) as the blue excimer and yellow materials, respectively. The resulting device exhibited an excellent spectra overlap ratio of 82.9 % with sunlight, while the device peak current efficiency, external quantum efficiency, and power efficiency were 18.5 cd/A, 6.34 %, and 11.68 lm/W, respectively, for sunlight-like WOLEDs.

Keywords: Concentration; Electron transportation layer; Excimer emission; Monomer emission; Sunlight-like WOLEDs.