Highly Efficient TADF Polymer Electroluminescence with Reduced Efficiency Roll-off via Interfacial Exciplex Host Strategy

Xingdong Lin; Yunhui Zhu; Baohua Zhang; Xiaofei Zhao; Bing Yao; Yanxiang Cheng; Zhanguo Li; Yi Qu; Zhiyuan Xie

doi:10.1021/acsami.7b16887

Highly Efficient TADF Polymer Electroluminescence with Reduced Efficiency Roll-off via Interfacial Exciplex Host Strategy

ACS Appl Mater Interfaces. 2018 Jan 10;10(1):47-52. doi: 10.1021/acsami.7b16887. Epub 2018 Jan 2.

Authors

Xingdong Lin¹, Yunhui Zhu^{2

3}, Baohua Zhang², Xiaofei Zhao², Bing Yao^{2

3}, Yanxiang Cheng², Zhanguo Li^{1

2}, Yi Qu¹, Zhiyuan Xie²

Affiliations

¹ School of Science, Changchun University of Science and Technology , Changchun 130022, P. R. China.
² State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun 130022, P. R. China.
³ University of Chinese Academy of Sciences , Beijing 100049, P. R. China.

PMID: 29283240
DOI: 10.1021/acsami.7b16887

Abstract

Solution-processed organic light-emitting diodes (s-OLED) consisting of TAPC/TmPyPB interfacial exciplex host and polymer PAPTC TADF emitter are prepared, simultaneously displaying ultralow voltages (2.50/2.91/3.51/4.91 V at luminance of 1/100/1000/1000 cd m^-2), high efficiencies (14.9%, 50.1 lm W^-1), and extremely low roll-off rates (J₅₀ of 63.16 mA cm^-2, L₅₀ of ca. 15000 cd m^-2). Such performance is distinctly higher than that of pure-PAPTC s-OLED. Compared to pure-PAPTC, the advanced emissive layer structure of TAPC:PAPTC/TmPyPB is unique in much higher PL quantum yield (79.5 vs 36.3%) and nearly 4-fold enhancement in k_RISC of the PAPTC emitter to 1.48 × 10⁷ s^-1.

Keywords: TADF polymer; efficiency roll-off; interfacial exciplex; solution-processed OLEDs; triplet concentration quenching.