Combining blue‐emitting LED chip and yellow‐emitting phosphor coating is efficient in manufacturing white light‐emitting diode (WLED). However, the lack of a uniformly distributed continuous emission spectrum in conventional WLED can result in “blue overshoot” and “cyan gap”, thus cause retinal damage and low color rendering index (CRI). Herein, a novel “kill two birds with one stone” strategy is reported: by preparing BaClF/CsPbBr3 heterostructures via a lattice‐ matching approach, F and Cl in BaClF matrix passivate the bromine vacancies of CsPbBr3 NCs, enhancing luminescence stability and achieving a blue‐shift of PL to obtain cyan‐emission. BaClF/CsPbBr3 heterostructures with controllable emissions in 468–510 nm can be fabricated by adjusting the molar ratios of CsPbBr3 to BaClF, and the photoluminescent quantum yield (PLQY) is up to 80.6%. The cyan‐emitting BaClF/CsPbBr3 heterostructure acting as a cyan color converter can effectively absorb the “blue overshoot” and fill the “cyan gap” in WLED, thus significantly increasing the CRI value of WLED from 70.1 to 86.2 and the luminescent efficiency boosts from 21.3 to 87.8 lmW−1. This work highlights a lattice‐matching strategy to produce ultra‐stable cyan‐emitting perovskite nanomaterials with high brightness and durability, paving the way for the application of perovskite NCs in next‐generation WLED lighting.

中文翻译：

---

晶格匹配的 BaClF/CsPbBr3 异质结构，具有增强且稳定的青色发射，可克服白光发光二极管的蓝光过冲和青色间隙


将蓝光 LED 芯片和黄光荧光粉涂层相结合，可以有效地制造白光发光二极管 （WLED）。然而，传统 WLED 中缺乏均匀分布的连续发射光谱会导致“蓝色过冲”和“青色间隙”，从而导致视网膜损伤和低显色指数 （CRI）。本文报道了一种新的“一石二鸟”策略：通过晶格匹配方法制备 BaClF/CsPbBr3 异质结构，BaClF 基体中的 F 和 Cl 钝化了 CsPbBr3 NCs 的溴空位，增强了发光稳定性，实现了 PL 的蓝移以获得青色发射。通过调整 CsPbBr3 与 BaClF 的摩尔比，可以制备出在 468–510 nm 范围内具有可控发射的 BaClF/CsPbBr3 异质结构，光致发光量子产率 （PLQY） 高达 80.6%。青色发射 BaClF/CsPbBr3 异质结构作为青色转换器，可以有效地吸收 WLED 中的“蓝色过冲”并填充“青色间隙”，从而将 WLED 的 CRI 值从 70.1 显著提高到 86.2，发光效率从 21.3 提高到 87.8 lmW−1。这项工作强调了一种晶格匹配策略，可以生产具有高亮度和耐用性的超稳定青色发射钙钛矿纳米材料，为钙钛矿 NC 在下一代 WLED 照明中的应用铺平了道路。