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Issue 19, 2019
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Blue perovskite light-emitting diodes based on RbX-doped polycrystalline CsPbBr3 perovskite films

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Abstract

Blue perovskite light-emitting diodes (PeLEDs) still exist some problems, such as low light-emitting efficiency, low brightness and color instability with regard to the counterparts of green and red PeLEDs. Chlorine-containing polycrystalline perovskites have been used to realize the blue electroluminescence (EL) with satisfied color purity. However, poor solubility of chlorine sources during the wet-process preparation of a polycrystalline perovskite film largely influences the film quality and the resultant EL behavior. Herein, a series of blue emissive polycrystalline perovskite films were prepared by employing RbX (X = Cl or Br) with a relatively good solubility as dopants in the CsPbBr3 perovskite film. The RbX-incorporated CsPbBr3 perovskite not only realizes blue emission, but also improves the film coverage from 80% to 99%. The corresponding RbBr- and RbCl-doped CsPbBr3 PeLEDs demonstrate bright blue emission with EL peaks located at 492 nm and 468 nm, respectively.

Graphical abstract: Blue perovskite light-emitting diodes based on RbX-doped polycrystalline CsPbBr3 perovskite films

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Supplementary files

Article information


Submitted
04 Mar 2019
Accepted
09 Apr 2019
First published
26 Apr 2019

J. Mater. Chem. C, 2019,7, 5596-5603
Article type
Paper

Blue perovskite light-emitting diodes based on RbX-doped polycrystalline CsPbBr3 perovskite films

H. Wang, X. Zhao, B. Zhang and Z. Xie, J. Mater. Chem. C, 2019, 7, 5596
DOI: 10.1039/C9TC01205B

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