Giant enhancement of photoluminescence quantum yield in 2D perovskite thin microplates by graphene encapsulation
作者机构：School of Optical and Electronic InformationHuazhong University of Science and TechnologyWuhan430074China Wuhan National Laboratory for OptoelectronicsHuazhong University of Science and TechnologyWuhan430074China
出 版 物：《Nano Research》 (纳米研究（英文版）)
年 卷 期：2021年第14卷第6期
页 面：1980-1984页
核心收录：
学科分类：081702[工学-化学工艺] 08[工学] 0817[工学-化学工程与技术] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0702[理学-物理学]
基 金：the support from the National Basic Research Program of China(No.2018YFA0704403) the National Natural Science Foundation of China(No.61674060)
主 题：two-dimensional perovskite photoluminescence quantum yield quantum confinement surface depletion field
摘 要：The optoelectronic performances of the layered materials are strongly dependent on the thickness of the samples due to the surface *** the size of the samples decreases to few nanometers,the surface depletion field and surface defect density are prominent arising from the large surface to volume *** instance,thin two-dimensional(2D)organic-inorganic hybrid perovskite microplates usually exhibit a rather low photoluminescence quantum yield(PLQY),owning to the strong surface ***,we report that the PLQY can be enhanced as large as 28 times in(iso-BA)2Pbl4(BA=C4H9NH3)2D perovskite thin microplates encapsulated by graphene,resulting in that the PLQY is more than 18%for the microplate with a thickness of 6.7 nm at 78 *** the thickness of the 2D perovskite microplate increases,the enhancement is gradually reduced and finally *** observation is in striking contrast to that in monolayer transition metal dichalcogenides(TMDs),when the PLQY is quenched by covering a layer of graphene due to the efficient charge *** enhancement of PLQY in 2D perovskites can be mainly ascribed to the reduced quantum confined Stark effect(QCSE)due to the reduced surface depletion field after covering graphene flake,resulting in the enhanced radiative recombination *** findings provide a cost-effective approach to enhance the luminescence,which may pave the way toward high performance light emitting devices based on 2D perovskites.
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