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Rb_2CuX_3 (X = Cl, Br): 1D All-Inorganic Copper Halides with Ultrabright Blue Emission and Up-Conversion Photoluminescence

机译:Rb_2CuX_3(X = Cl,Br):具有超亮蓝光发射和上转换光致发光的一维全无机卤化铜

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摘要

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.
机译:由于其在光电子领域的应用前景,诸如Cs4PbX6和CsPbX3(X = Cl,Br和I)之类的全无机金属卤化物正引起全球关注。但是,这些材料中有毒重金属铅(Pb)的存在是一个主要问题。在这里,报道了一个无毒的高效发蓝光的全无机卤化物Rb2CuX3(X = Br和Cl)家族;该化合物显示出一维晶体结构,其特征是由Rb +阳离子隔开的阴离子无穷大1 [CuX3](2-)带。 Rb2CuBr3和Rb2CuCl3的实测记录高光致发光量子产率分别为64%至100%。此外,对于Rb2CuBr3和Rb2CuCl3,测得的发射线宽非常窄,全宽分别为54和52 nm的一半最大值。 Rb2CuCl3单晶显示出抗斯托克斯光致发光信号,首次显示了无铅金属卤化物。基于无毒且廉价的金属铜的高效窄蓝光发射器的发现,为考虑将低成本和环保的卤化铜用于实际应用铺平了道路。

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