Metal halides are an important class of optoelectronic materials combining exceptional optical and electronic properties.An inherent advantage of metal halides is their solution synthesis and processability,which rend...Metal halides are an important class of optoelectronic materials combining exceptional optical and electronic properties.An inherent advantage of metal halides is their solution synthesis and processability,which render them as low-cost and environmentally friendly materials for a range of applications from photovoltaics and photodetection to solid-state lighting(SSL).In this study,we synthesized three previously unreported lead-free organic–inorganic hybrid copper halides:(OA)_(4)CuX_(5)(X=Br,I;OA^(+) =C_(8)H_(17)NH_(3)^(+) ,n-octylammonium cation)and(HA)_(2)CuI_(3)(HA^(+) =C_(6)H_(13)NH_(3)^(+) ,n-hexylammonium cation),all of which exhibit broadband emissions arising from self-trapped excitons(STEs).Among these compounds,(OA)_(4)CuI_(5) demonstrates tunable dual-band white-light emission with a high color rendering index value of 91 at room temperature.Temperature-dependent photoluminescence measurements and first-principles calculations reveal distinct behaviors between the two emission states in(OA)_(4)CuI_(5).These findings highlight the potential of copper halide compounds for optoelectronic applications,particularly in the development of environmentally friendly solid-state lighting technologies.展开更多
基金primarily supported by Grant 2022066 from the U.S.-Israel Binational Science Foundation(BSF)support by the U.S.Department of Energy,Office of Science,Office of Basic Energy Sciences,under Award Number DESC0025485(material synthesis and structural characterization)+1 种基金supported by the U.S.DOE,Office of Basic Energy Sciences,under Contract No.DE-AC02-06CH11357the support from the US National Science Foundation through awards DMR-2317008。
文摘Metal halides are an important class of optoelectronic materials combining exceptional optical and electronic properties.An inherent advantage of metal halides is their solution synthesis and processability,which render them as low-cost and environmentally friendly materials for a range of applications from photovoltaics and photodetection to solid-state lighting(SSL).In this study,we synthesized three previously unreported lead-free organic–inorganic hybrid copper halides:(OA)_(4)CuX_(5)(X=Br,I;OA^(+) =C_(8)H_(17)NH_(3)^(+) ,n-octylammonium cation)and(HA)_(2)CuI_(3)(HA^(+) =C_(6)H_(13)NH_(3)^(+) ,n-hexylammonium cation),all of which exhibit broadband emissions arising from self-trapped excitons(STEs).Among these compounds,(OA)_(4)CuI_(5) demonstrates tunable dual-band white-light emission with a high color rendering index value of 91 at room temperature.Temperature-dependent photoluminescence measurements and first-principles calculations reveal distinct behaviors between the two emission states in(OA)_(4)CuI_(5).These findings highlight the potential of copper halide compounds for optoelectronic applications,particularly in the development of environmentally friendly solid-state lighting technologies.
