光致发光
量子产额
锡
材料科学
碘化物
斯托克斯位移
卤化物
微秒
光化学
光电子学
化学
发光
无机化学
光学
荧光
物理
冶金
作者
Sushant Ghimire,Kevin R. Oldenburg,Stephan Bartling,Rostyslav Lesyuk,Christian Klinke
出处
期刊:ACS energy letters
[American Chemical Society]
日期:2022-02-11
卷期号:7 (3): 975-983
被引量:17
标识
DOI:10.1021/acsenergylett.1c02777
摘要
We report a structural reconstruction-induced high photoluminescence quantum yield of 25% in colloidal two-dimensional tin iodide nanosheets that are synthesized by a hot-injection method. The as-synthesized red-colored nanosheets of octylammonium tin iodide perovskites at room temperature transform to white hexagonal nanosheets upon washing or exposure to light. This structural change increases the bandgap from 2.0 to 3.0 eV, inducing a large Stokes shift and a broadband emission. Further, a long photoluminescence lifetime of about 1 μs is measured for the nanosheets. Such long-lived broad and intense photoluminescence with a large Stokes shift is anticipated to originate from tin iodide clusters that are formed during the structural reconstruction. The stereoactive 5s2 lone pair of tin(II) ions perturbs the excited state geometry of the white hexagonal nanosheets and facilitates the formation of self-trapped excitons. Such broadband and intensely emitting metal halide nanosheets are promising for white light-emitting diodes.
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