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Rb 2 CuX 3 (X = Cl, Br): 1D All‐Inorganic Copper Halides with Ultrabright Blue Emission and Up‐Conversion Photoluminescence
Author(s) -
Creason Tielyr D.,
Yangui Aymen,
Roccanova Rachel,
Strom Amanda,
Du MaoHua,
Saparov Bayrammurad
Publication year - 2020
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.201901338
Subject(s) - halide , photoluminescence , copper , metal halides , materials science , quantum yield , metal , single crystal , inorganic chemistry , optoelectronics , crystallography , optics , chemistry , fluorescence , metallurgy , physics
All‐inorganic metal halides such as Cs 4 PbX 6 and CsPbX 3 (X = Cl, Br, and I) are attracting global attention owing to their promise in optoelectronic applications. However, the presence of the toxic heavy metal lead (Pb) in these materials is a major concern. Here, a family of nontoxic high‐efficiency blue‐emitting all‐inorganic halides Rb 2 CuX 3 (X = Br and Cl) is reported; the compounds exhibit 1D crystal structures featuring anionic∞ 1 [ C u X 3 ] 2− ribbons separated by Rb + cations. The measured record high photoluminescence quantum yield values range from 64% to 100% for Rb 2 CuBr 3 and Rb 2 CuCl 3 , respectively. Furthermore, the measured emission linewidths are quite narrow with full width at half maximum values of 54 and 52 nm for Rb 2 CuBr 3 and Rb 2 CuCl 3 , respectively. Single crystals of Rb 2 CuCl 3 demonstrate an anti‐Stokes photoluminescence signal, shown for the first time for Pb‐free metal halides. The discovery of highly efficient narrow blue emitters based on a nontoxic and inexpensive metal copper paves a way for the consideration of low‐cost and environmentally friendly copper halides for practical applications.