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Europium Addition Reduces Local Structural Disorder and Enhances Photoluminescent Yield in Perovskite CsPbBr 3
Author(s) -
Quinn Xueying L.,
Kumar Rishi E.,
Kodur Moses,
Cakan Deniz N.,
Cai Zhonghou,
Zhou Tao,
Holt Martin V.,
Fenning David P.
Publication year - 2021
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.202002221
Subject(s) - europium , materials science , photoluminescence , perovskite (structure) , synchrotron , luminescence , stoichiometry , yield (engineering) , fluorescence , diffraction , optoelectronics , crystallography , optics , chemistry , composite material , physics
Correlative X‐ray microscopy, including synchrotron X‐ray diffraction and fluorescence, is leveraged to understand the local role of europium as a B‐site additive in CsPbBr 3 perovskite crystals. Europium addition reduces microstrain in the perovskite, despite the fact that the degree of europium incorporation into the perovskite varies locally, with a maximum loading over twice the nominal stoichiometry. The presence of europium improves photoluminescence yield and bandwidth, while shifting the emission to bluer wavelengths. Finally, europium‐containing crystals have greatly improved X‐ray hardness. The findings show promise for europium as an additive in perovskite optoelectronic devices.