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

Advanced Science
Jianxun LuZhanhua Wei

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 (ηc), 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 ηc 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.

References

Apr 16, 2009·Journal of the American Chemical Society·Akihiro KojimaTsutomu Miyasaka
Dec 20, 2012·Reports on Progress in Physics·Zhanghua Han, Sergey I Bozhevolnyi
Aug 5, 2014·Nature Nanotechnology·Zhi-Kuang TanRichard H Friend
Nov 26, 2014·Advanced Materials·Young-Hoon KimTae-Woo Lee
Jan 22, 2015·Optics Express·Ruidong ZhuShin-Tson Wu
Apr 17, 2014·The Journal of Physical Chemistry Letters·Felix DeschlerRichard H Friend
Aug 31, 2018·Advanced Materials·Li Na QuanEdward H Sargent
May 24, 2019·The Journal of Physical Chemistry Letters·Zhanhua Wei, Jun Xing

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Citations

Mar 21, 2021·Light, Science & Applications·Li ZhangMingjian Yuan
Mar 18, 2021·Reports on Progress in Physics·Ziming ChenHin-Lap Yip
Sep 18, 2020·The Journal of Physical Chemistry Letters·Lin ZhuNana Wang

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