High-efficiency narrow-band red phosphor plays a profound part in stimulating illumination quality for white light-emitting diodes (WLEDs). In this work, a series of novel double-perovskite Rb₂KInF₆:Mn⁴⁺ red phosphors was successfully prepared by using a facile co-precipitation technique. The crystallization, particle morphology, photoluminescence properties, and thermal quench behavior of the as-synthesized powder samples were investigated systematically. During the illumination with blue (λ_max = 468 nm) and ultraviolet light (λ_max = 370 nm), the prepared Rb₂KInF₆:Mn⁴⁺ phosphors emited a series of narrowband red signals in the range 590–660 nm with strong zero-phonon line (ZPL) emission. Meanwhile, the optimum Mn⁴⁺ concentration of at the ²E_g→⁴A_2g transitions was also studied. Moreover, the fluorescence decay lifetimes of the prepared Rb₂KInF₆:Mn⁴⁺ products were milliseconds. Finally, by coating Rb₂KInF₆:Mn⁴⁺ with commercially yellow Y₃Al₅O₁₂:Ce³⁺ (YAG:Ce³⁺) phosphors on the commercially available InGaN blue chip, the intense warm white light with suitable correlated color temperature (CCT, 3491 K) and high color-rendering index (R_a, 85.1) can be manufactured at a driving current of 20 mA. All of these consequences point out that the novel double-perovskite red-emitting Rb₂KInF₆:Mn⁴⁺ phosphors are promising in the perspective of WLEDs applications.

高效窄带红色荧光粉在提高白光发光二极管 (WLED) 的照明质量方面发挥着重要作用。在这项工作中，采用简便的共沉淀技术成功制备了一系列新型双钙钛矿 Rb ₂ KInF ₆ :Mn ^{4+红色荧光粉。}系统地研究了合成后的粉末样品的结晶、颗粒形态、光致发光性质和热猝灭行为。在蓝光（λ _max  = 468 nm）和紫外光（λ _max  = 370 nm）的照射下，制备的Rb ₂ KInF ₆ :Mn ⁴⁺荧光粉在 590-660 nm 范围内发射一系列窄带红色信号，具有强零声子线 (ZPL) 发射。^{同时，还研究了2} E _g → ⁴ A _2g转变时的最佳Mn ⁴⁺浓度。_{此外，制备的Rb 2} KInF ₆ :Mn ⁴⁺产物的荧光衰减寿命为毫秒。最后，通过用商业黄色 Y ₃ Al ₅ O ₁₂ :Ce ³⁺ (YAG:Ce ³⁺ ) 涂覆 Rb ₂ KInF ₆ :Mn ⁴⁺) 荧光粉在市售的 InGaN 蓝芯片上，可以在 20 mA 的驱动电流下制造出具有合适相关色温（CCT，3491 K）和高显色指数（Ra，85.1）_的强暖白光。所有这些结果表明，新型双钙钛矿红光 Rb ₂ KInF ₆ :Mn ⁴⁺荧光粉在 WLED 应用方面很有前景。