Lead‐free halide perovskites (LHP) have attracted extensive attention in the field of next‐generation solid‐state lighting. However, single perovskite phosphor with tunable white‐light emission and ultra‐high photoluminescence quantum yield (PLQY) are rare. Here, the tunable dual‐color emission LHP phosphor is developed with a near‐unity PLQY of 99.5%. The LHP phosphor comprises Cs2NaInCl6: Sb3+/Bi3+ and Cs2InCl5·H2O: Sb3+/Bi3+ crystals, with the transition between these two perovskite structures being adjustable by the concentration of Na+. The addition of NaCl inhibits the hydrolysis of the [Sb(H2O)Cl5]2− octahedron, resulting in 3D connected [SbCl6]3− octahedron with less Jahn‐Teller distortion, and the PLQY of LHP is greater than 90%. Finally, the white‐light diode device is fabricated by assembling the LHP with a ultraviolet light‐emitting diode chip and the white light‐emitting diode device achieved Commission Internationale de l'Eclairage color coordinates of (0.34, 0.33), correlated color temperature of 4936 K, and a high color rendering index of 92.9. The LHP perovskite exhibited multimodal luminescence when excited by 365, 335, and 310 nm UV light, showing the multi‐mode anti‐counterfeiting capabilities of the LHP crystals.

中文翻译：

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无铅卤化物钙钛矿，具有 ≈100% PLQY 和双色发射，适用于白光发光二极管


无铅卤化物钙钛矿 （LHP） 在下一代固态照明领域引起了广泛关注。然而，具有可调白光发射和超高光致发光量子产率 （PLQY） 的单个钙钛矿荧光粉很少见。在这里，可调谐双色发射 LHP 荧光粉的开发具有 99.5% 的近乎统一的 PLQY。LHP 荧光粉包括 Cs2NaInCl6：Sb3+/Bi3+ 和 Cs2InCl5·H2O：Sb3+/Bi3+ 晶体，这两种钙钛矿结构之间的过渡可通过 Na+ 的浓度进行调整。NaCl 的添加抑制了 [Sb（H2O）Cl5]2− 八面体的水解，导致 3D 连接的 [SbCl6]3− 八面体具有较小的 Jahn-Teller 失真，并且 LHP 的 PLQY 大于 90%。最后，将 LHP 与紫外发光二极管芯片组装而成，制备了白光二极管器件，使白光发光二极管器件达到国际克莱拉奇委员会色坐标 （0.34， 0.33），相关色温为 4936 K，显色指数高达 92.9。LHP 钙钛矿在被 365、335 和 310 nm 紫外光激发时表现出多模式发光，显示了 LHP 晶体的多模式防伪能力。