Light-emitting diodes based on all-inorganic copper halide perovskite with self-trapped excitons

查看全文 作　　者：Nian [1]Liu;Xue [1]Zhao;Mengling [1]Xia;Guangda [1]Niu;Qingxun [1]Guo;Liang [1]Gao;Jiang [1]Tang

机构地区：[1]Wuhan National Laboratory for Optoelectronics,Huazhong University of Science and Technology,Wuhan 430074,China

出　　处：《Journal of Semiconductors》索引2020年第41卷第5期,共5页

基　　金：supported by the National Key R&D Program of China(2016YFB070700702);the National Natural Science Foundation of China(51761145048);the Fundamental Research Funds for the Central Universities(HUST:2019421JYCXJJ004);the China Postdoctoral Science Foundation Grant(2019M662624). 摘　　要：Light-emitting diodes based on lead halide perovskite have attracted great attention due to their outstanding performance.However,their application is plagued by the toxicity of Pb and the poor stability.Herein novel copper-based all inorganic perovskite CsCu2I3 with much enhanced stability has been reported with a potential photoluminescence quantum yield(PLQY)over 20%and self-trapped excitons(STE).By taking advantage of its extraordinary thermal stability,we successfully fabricate high-quality CsCu2I3 film through direct vacuum-based deposition(VBD)of CsCu2I3 powder.The resulting film shows almost the same PLQY with the synthesized powder,as well as excellent uniformity and stability.The perovskite light-emitting diodes(Pe-LED)based on the evaporated CsCu2I3 emitting layer achieve a luminescence of 10 cd/m2 and an external quantum efficiency(EQE)of 0.02%.To the best of our knowledge,this is the first CsCu2I3 Pe-LED fabricated by VBD with STE property,which offers a new avenue for lead-free Pe-LED. 关键词：LIGHT-EMITTING DIODES copper HALIDE PEROVSKITE vacuum-based evaporation self-trapped EXCITON

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Light-emitting diodes based on all-inorganic copper halide perovskite with self-trapped excitons

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