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首页> 外文期刊>RSC Advances >Lead-free cesium tin halide nanocrystals for light-emitting diodes and color down conversion
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Lead-free cesium tin halide nanocrystals for light-emitting diodes and color down conversion

机译：用于发光二极管的无铅铯卤化铯纳米晶体和色彩下降转换

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Organometal halide perovskites are attracting a great deal of attention because of their long carrier diffusion lengths, wide wavelength tunability, and narrow-band emission. However, the toxicity of lead has caused considerable environmental and health concerns. In this work, lead-free cesium tin halide nanocrystals are synthesized and investigated. CsSnBr _(3) and CsSnI _(3) nanocrystals, 25 and 7 nm in size, are synthesized by a facile hot injection method. Absorption spectroscopy, photoluminescence spectroscopy, and X-ray diffraction were used to understand their structural and optical properties. CsSnBr _(3) and CsSnI _(3) nanocrystals show emission peaks at 683 and 938 nm, respectively. These nanocrystals show shelf stability for a few months. Temperature-dependent photoluminescence is utilized to know more about fundamental physical parameters, such as exciton binding energy, charge carrier–phonon interactions and band gap. Light-emitting diodes and color down-conversion films are also demonstrated using these lead free perovskite nanocrystals.
机译：有机计量卤化物钙钛矿由于它们的长载波扩散长度，宽波长可调性和窄带排放而引起了大量的关注。然而，铅的毒性导致了相当大的环境和健康问题。在这项工作中，合成并研究了无铅卤化铯纳米晶体。 CSSNBR _（3）和CSSNI _（3）纳米晶体，尺寸为25和7nm，通过容易的热注射方法合成。使用吸收光谱，光致发光光谱和X射线衍射来了解它们的结构和光学性质。 CSSNBR _（3）和CSSNI _（3）纳米晶体分别显示在683和938nm处的发射峰。这些纳米晶体显示出架子稳定性几个月。温度依赖性光致发光可用于更多地了解基本物理参数，例如激子结合能量，电荷载波 - 声子相互作用和带隙。还使用这些无铅钙钛矿纳米晶体来证明发光二极管和颜色下转换膜。

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