Abstract
AbstractNarrow‐band red‐emitting fluoride phosphors play a crucial role in lighting and backlight displays, whereas the stability issue is a major challenge. Here, highly stable K2SiF6:Mn4+ (KSFM) single crystal phosphors with tunable sizes (20–1000 µm) are grown by a facile saturated crystallization method. The small specific surface area together with the unique Mn4+‐rare interface layer in KSFM single crystals enables the simultaneous fulfillment of high external quantum efficiency, excellent moisture, improved thermal quenching, and dissipation for high‐power and laser‐driven lighting applications. As a prototype, a warm white laser diode device with a high luminous flux of 202.7 lm and correlated color temperature of 3277 K, as well as a color rendering index of 87.9 is presented. This work provides new insights into the development of highly efficient and stable materials for advanced lighting applications.
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