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7230402 
Journal Article 
Rb2CuX3 (X = Cl, Br): 1D All-Inorganic Copper Halides with Ultrabright Blue Emission and Up-Conversion Photoluminescence 
Creason, TD; Yangui, A; Roccanova, R; Strom, A; Du, MaoHua; Saparov, B; , 
2020 
WILEY-V C H VERLAG GMBH 
WEINHEIM 
WOS:000496011900001 
All-inorganic metal halides such as Cs4PbX6 and CsPbX3 (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 Rb2CuX3 (X = Br and Cl) is reported; the compounds exhibit 1D crystal structures featuring anionic infinity 1[CuX3](2-) ribbons separated by Rb+ cations. The measured record high photoluminescence quantum yield values range from 64% to 100% for Rb2CuBr3 and Rb2CuCl3, respectively. Furthermore, the measured emission linewidths are quite narrow with full width at half maximum values of 54 and 52 nm for Rb2CuBr3 and Rb2CuCl3, respectively. Single crystals of Rb2CuCl3 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.