A new method is proposed for the formation of MAPbBr3 nanoparticles in situ in a dispersion of polystyrene in toluene in the absence (MAPbBr3@PS) and presence of a broad-band luminophor (MAPbBr3/GAG:Ce@PS). This method permits the lossless use of perovskite, a uniform distribution of the luminophor nanoparticles in the polymer matrix, and maintenance of a high photoluminescence quantum yield (~46%). The samples derived from MAPbBr3 have green photoluminescence with a maximum showing a blue shift in going from bulk perovskite powder to films due to a size effect. The use of nanocomposite films MAPbBr3/GAG:Ce@PS in white LEDs permits enhancement of the color rendering index to 92 with correlation color temperature >5800 K.

中文翻译：

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在聚苯乙烯中原位形成的 CH3NH3PbBr3 纳米晶体用于提高白色 LED 的显色指数

提出了一种在不存在（MAPbBr3@PS）和存在宽带发光体（MAPbBr3/GAG:Ce@PS）的情况下，在聚苯乙烯在甲苯中的分散体中原位形成MAPbBr3纳米颗粒的新方法。这种方法允许无损使用钙钛矿、发光体纳米粒子在聚合物基质中的均匀分布，并保持高光致发光量子产率 (~46%)。源自 MAPbBr3 的样品具有绿色光致发光，最大值显示由于尺寸效应从块状钙钛矿粉末到薄膜的蓝移。在白光 LED 中使用纳米复合薄膜 MAPbBr3/GAG:Ce@PS 可以将显色指数提高到 92，相关色温 >5800 K。