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In recent times, there has been significant interest in ultraviolet-excited white light-emitting devices (WLEDs) for the advancement of solid-state lighting technologies. However, it is still a huge challenge to get efficient blue and yellow light emission under the same excitation wavelength. Here, Sb-doped Cs2NaInCl6 (Cs2NaInCl6:Sb3+) and Sb-doped Cs2InCl5·H2O (Cs2InCl5·H2O:Sb3+) with stable and efficient blue and yellow light emission, and highly overlapped excitation wavelength ranges were reported. Then, by applying shell layers of Cs2InCl5·H2O: Sb3+ on the core of Cs2NaInCl6:Sb3+ , a variation from blue to cool-white, pure-white, warm-white and yellow was achieved. Amazingly, the pure-white light emitting core-shell MCs achieved a high photoluminescence quantum yield (PLQY) up to 70% under the radiation of the same wavelength. More importantly, the as-prepared core-shell MCs exhibited excellent UV, heat, and storage stability, which made it possible for the application as phosphor in WLEDs. Finally, the core-shell MCs prepared in this study were applied onto a 310 nm UV LED chip to produce the WLEDs. These WLEDs exhibited an exceptionally high color rendering index of 94.5, along with a pure-white Commission Internationale de L’Eclairage color coordinate of (0.31, 0.32), and demonstrated remarkable long-term operational stability. The outstanding optical properties and stability observed in the WLEDs suggest promising applications for the Cs2NaInCl6:Sb3+ @ Cs2InCl5·H2O:Sb3+ core-shell MCs in next-generation solid-state lighting.
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