In this study, the facile synthesis and electroluminescent perovskite light-emitting diodes (PeLEDs) of highly luminescent Cs₄PbBr₆/CsPbBr₃ nanocomposite has been demonstrated. With the addition of proper antisolvents, the nanocomposite with a production yield of >90% and quantum yield of >85% was readily derived from the transformation of CsPbBr₃ powder. The obtained high quantum yield of the green nanocomposite originated from the fluorescent CsPbBr₃ nanocrystals embedded in the Cs₄PbBr₆ matrix, which was verified by X-ray diffraction, absorption, photoluminescence (PL), and PL excitation spectra. The addition of large cation precursors, such as CsBr and CH(NH₂)₂Br, could contribute to the transformation efficiency and had no influence on the composition of the embedded nanocrystals. Via the thermal evaporation of the nanocomposite, all-inorganic electroluminescent PeLEDs with CuSCN and Cu-doped NiO_x (NiO_x:Cu) nanoparticles were fabricated and characterized. A maximum luminance of 1780 cd/m² and efficiency of 0.43 cd/A were achieved. Thus, the luminescent Cs₄PbBr₆/CsPbBr₃ nanocomposite is a promising material for next-generation displays and lighting.

中文翻译：

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用于全无机电致钙钛矿发光二极管的Cs ₄ PbBr ₆ / CsPbBr ₃纳米复合材料

在这项研究中，已证明了高发光Cs ₄ PbBr ₆ / CsPbBr ₃纳米复合材料的便捷合成和电致发光钙钛矿发光二极管（PeLED）。通过添加适当的抗溶剂，可以轻松地从CsPbBr ₃粉末的转化中获得纳米复合材料，其产率> 90％，量子产率> 85％。获得的绿色纳米复合材料高量子产率源自嵌入在Cs ₄ PbBr _6中的荧光CsPbBr ₃纳米晶体。基质，通过X射线衍射，吸收，光致发光（PL）和PL激发光谱进行了验证。添加较大的阳离子前体，例如CsBr和CH（NH ₂）₂ Br，可以提高转化效率，并且对嵌入的纳米晶体的组成没有影响。通过纳米复合材料的热蒸发，制备并表征了具有CuSCN和Cu掺杂的NiO _x（NiO _x：Cu）纳米粒子的全无机电致发光PeLED 。获得了最大亮度1780 cd / m ²和效率0.43 cd / A。因此，发光Cs ₄ PbBr ₆ / CsPbBr ₃ 纳米复合材料是用于下一代显示器和照明的有前途的材料。