Realization of efficient light out-coupling in organic light-emitting diodes with surface carbon-coated magnetic alloy nanoparticles

Qingchen Dong; Feifei Tai; Hong Lian; Bo Zhao; Zheng Zhong; Zheng Chen; Jianxin Tang; Furong Zhu

doi:10.1039/c6nr09769c

Realization of efficient light out-coupling in organic light-emitting diodes with surface carbon-coated magnetic alloy nanoparticles

Nanoscale. 2017 Feb 23;9(8):2875-2882. doi: 10.1039/c6nr09769c.

Authors

Qingchen Dong¹, Feifei Tai¹, Hong Lian¹, Bo Zhao¹, Zheng Zhong¹, Zheng Chen¹, Jianxin Tang², Furong Zhu³

Affiliations

¹ MOE Key Laboratory of Interface Science and Engineering in Advanced Materials and Research Center of Advanced Materials Science and Technology, Taiyuan University of Technology, 79 Yingze West Street, Taiyuan 030024, P.R. China. dongqingchen@tyut.edu.cn.
² Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Institute of Functional Nano and Soft Material (FUNSOM), Soochow University, Suzhou, 215123, P. R. China. jxtang@suda.edu.cn.
³ MOE Key Laboratory of Interface Science and Engineering in Advanced Materials and Research Center of Advanced Materials Science and Technology, Taiyuan University of Technology, 79 Yingze West Street, Taiyuan 030024, P.R. China. dongqingchen@tyut.edu.cn and Department of Physics and Institute of Advanced Materials, Hong Kong Baptist University, 224 Waterloo Road, Kowloon Tong, Hong Kong, P.R. China. frzhu@hkbu.edu.hk.

PMID: 28169389
DOI: 10.1039/c6nr09769c

Abstract

A significant enhancement in light extraction in organic light-emitting diodes (OLEDs) is realized by using composite hole transport layers (HTLs) with surface carbon-coated magnetic alloy nanoparticles (NPs). Compared to the control device with a standard architecture, the current efficiencies of fluorescent green OLEDs can be enhanced by 47.1% and 48.5% by mixing the surface carbon-coated magnetic FePt (0.5 wt‰) and CoPt (0.5 wt‰) alloy NPs into poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS), yielding the maximum values of 5.40 cd A^-1 and 5.45 cd A^-1, respectively. The presence of an alloy NP-incorporated PEDOT:PSS HTL also acts as an optical out-coupling layer contributing to the efficiency enhancement, accomplished through the collective effects of light-scattering, localized surface plasmon resonance and increased electron trap density induced by magnetic alloy NPs.