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Title: Improvement of photophysical properties of CsPbBr3 and Mn2+:CsPb(Br,Cl)(3) perovskite nanocrystals by Sr2+ doping for white light-emitting diodes
Authors: Yüce, Hürriyet
Mandal, Mukunda
Yalçınkaya, Yenal
Andrienko, Denis
Demir, Mustafa Muammer
Izmir Institute of Technology
Max Planck Inst Polymer Res
Max Planck Inst Polymer Res
Max Planck Inst Polymer Res
Izmir Institute of Technology
Keywords: Transition metals
Issue Date: Jun-2022
Publisher: American Chemical Society
Abstract: All-inorganic metal halide perovskite nanocrystals (NCs) having the general formula ABX(3), where A is a monovalent cation, for example, Cs+, B is a divalent cation, typically Pb2+, and X is Cl-, Br-, I-, or their binary mixture, show potential in optoelectronic devices. In this work, we explore the effect of B-site doping on the optoelectronic properties of CsPbX3 NCs (X = Br, Cl). First, the Pb2+ ions in the pristine CsPbBr3 NC are partially substituted by Mn2+ ions. The alkaline earth metal strontium is then doped on both pristine and the Mn2+-substituted NCs. We found that a small percentage of Sr2+ doping remarkably improves the photoluminescence quantum yield of CsPbBr3 and Mn2+-state emission in Mn2+:CsPb(Br,Cl)(3) NCs. Perovskite NC film/ poly(methyl methacrylate) composites with all four NC variants were used in a white light-emitting diode (WLED), where Sr2+ doping increased the luminous efficiency of the WLED by similar to 4.7%. We attribute this performance enhancement to a reduced defect density and an attenuated microstrain in the local NC structure.
Description: Article; Early Access
Appears in Collections:Materials Science and Engineering / Malzeme Bilimi ve Mühendisliği
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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