Lead halide perovskites have attracted great attention on their promising luminescent properties. However, their practical use is hampered by the toxicity of Pb, and also the photoluminescence efficiency in violet region is much lower than green and red emitters. Herein, a new copper (I) halide with nontoxicity and efficient violet emission was synthesized and characterized. The major emission peak locates at 386 nm, the photoluminescence quantum yield reaches 98.8%, and the Stokes shift is as high as 1.15 eV K₂CuCl₃ crystal consists of one dimensional [CuCl₄]^3- tetrahedral ribbons, which are isolated by K⁺ ions. The one dimensional crystal structure and the formation of self-trapped excitons, benefit the large thermal activation energy of 1090 meV, which contributes to the observed efficient emission.

卤化钙钛矿铅因其有前途的发光特性而备受关注。然而，它们的实际使用受到铅的毒性的阻碍，并且紫色区域的光致发光效率也远低于绿色和红色发光体。本文合成并表征了一种新型的无毒，高效紫光的卤化铜（I）。主要发射峰位于386 nm，光致发光量子产率达到98.8％，斯托克斯位移高达1.15 eV K ₂ CuCl ₃晶体由一维[CuCl ₄ ] ^3-四面体带组成，由K隔离⁺离子。一维晶体结构和自陷激子的形成有利于1090 meV的大热活化能，这有助于观察到有效的发射。