The photoluminescence quantum yield (PLQY) of CsPbBr₃ perovskite nanocrystals (NCs) prepared by the hot-injection method can exceed 90%, which have attracted intensive attention for white light-emitting diodes (WLEDs). However, the whole hot-injection experiment requires air isolation and relatively high temperature. In addition, the poor stability of CsPbBr₃ NCs impedes their applications. Here, a facile method is reported to synthesize CsPbBr₃@ZrO₂ NCs at room temperature in air. Owing to using ZrO₂ coated CsPbBr₃ NCs, the prepared CsPbBr₃@ZrO₂ NCs not only present a PLQY of 80% but also exhibit an enhanced stability to heat and moisture. Furthermore, WLEDs are fabricated with CsPbBr₃@ZrO₂ NCs and commercial red phosphors (CaAlSiN₃:Eu²⁺) on blue LEDs chips. The fabricated WLEDs exhibit a correlated color temperature (CCT) of 4743 K and luminous efficacy as high as 64.0 Lm W^–1. In addition, visible light communication with a high data rate of 33.5 Mbps is achieved using the WLEDs. This work provides a room temperature strategy to coat zirconia for CsPbBr₃@ZrO₂ NCs, benefiting to enhance the optical performance and stability, as well as the promotion of the great potentials in solid-state illuminating and visible light communication applications.

中文翻译：

---

用于白光发光二极管和可见光通信的稳定氧化锆涂层 CsPbBr3 纳米晶体的室温合成

通过热注入法制备的CsPbBr ₃钙钛矿纳米晶（NCs）的光致发光量子产率（PLQY）可以超过90%，这引起了白光发光二极管（WLEDs）的广泛关注。然而，整个热注射实验需要空气隔离和相对较高的温度。此外，CsPbBr ₃ NCs 的稳定性差阻碍了它们的应用。在这里，报道了一种在室温下在空气中合成 CsPbBr ₃ @ZrO ₂ NCs的简便方法。由于使用了 ZrO ₂包覆的 CsPbBr ₃ NCs，制备的 CsPbBr ₃ @ZrO ₂NCs 不仅具有 80% 的 PLQY，而且对热和湿气具有增强的稳定性。此外，WLED 是用 CsPbBr ₃ @ZrO ₂ NCs 和商业红色磷光体（CaAlSiN ₃ :Eu ²⁺）在蓝色 LED 芯片上制造的。制造的 WLED 的相关色温 (CCT) 为 4743 K，发光效率高达 64.0 Lm W ^–1。此外，使用 WLED 还可以实现 33.5 Mbps 的高数据速率的可见光通信。这项工作提供了一种室温策略来为 CsPbBr ₃ @ZrO ₂涂覆氧化锆 NCs，有利于提高光学性能和稳定性，促进固态照明和可见光通信应用的巨大潜力。