Ultrathin PEDOT:PSS Enables Colorful and Efficient Perovskite Light-Emitting Diodes

Jianxun Lu; Wenjing Feng; Guanding Mei; Jiayun Sun; Chuanzhong Yan; Di Zhang; Kebin Lin; Dan Wu; Kai Wang; Zhanhua Wei

doi:10.1002/advs.202000689

Ultrathin PEDOT:PSS Enables Colorful and Efficient Perovskite Light-Emitting Diodes

Adv Sci (Weinh). 2020 Apr 13;7(11):2000689. doi: 10.1002/advs.202000689. eCollection 2020 Jun.

Authors

Jianxun Lu¹, Wenjing Feng¹, Guanding Mei², Jiayun Sun², Chuanzhong Yan¹, Di Zhang¹, Kebin Lin¹, Dan Wu^{3

2}, Kai Wang², Zhanhua Wei¹

Affiliations

¹ Institute of Luminescent Materials and Information DisplaysCollege of Materials Science and Engineering Huaqiao University Xiamen 361021 P. R. China.
² Department of Electrical and Electronic Engineering Southern University of Science and Technology Shenzhen 518055 P. R. China.
³ Academy for Advanced Interdisciplinary Studies Southern University of Science and Technology Shenzhen 518055 P. R. China.

Abstract

Recently, metal halide perovskite light-emitting diodes (Pero-LEDs) have achieved significant improvement in device performance, especially for external quantum efficiency (EQE). And EQE is mostly determined by internal quantum efficiency of the emitting material, charge injection balancing factor (η_c), and light extraction efficiency (LEE) of the device. Herein, an ultrathin poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (UT-PEDOT:PSS) hole transporter layer is prepared by a water stripping method, and the UT-PEDOT:PSS can enhance η_c and LEE simultaneously in Pero-LEDs, mostly due to the improved carrier mobility, more matched energy level alignment, and reduced photon loss. More importantly, the performance enhancement from UT-PEDOT:PSS is quite universal and applicable in different kinds of Pero-LEDs. As a result, the EQEs of Pero-LEDs based on 3D, quasi-3D, and quasi-2D perovskites obtain enhancements of 42%, 87%, and 111%, and the corresponding maximum EQE reaches 17.6%, 15.0%, and 6.8%, respectively.

Keywords: light‐emitting diodes; outcoupling efficiency; perovskites light‐emitting diodes; poly(3,4‐ethylenedioxythiophene):poly(styrene sulfonate).