Abstract
AbstractA thermally robust all‐inorganic color converter is imperative to high‐power light‐emitting diode (LED) lighting. However, it remains challenging to find a universal inorganic matrix for encapsulating multicolor phosphors due to the hurdle of achieving a highly transparent medium at a moderate temperature. Here, the densification of calcium fluoride (CaF2) nanoceramic with visible transmittance up to 75% at merely 350 °C, benefiting from an acid‐mediated cold sintering process of oxygen‐segregated CaF2 nanoparticles is reported. Using the optically isotropic CaF2 as a transparent platform, a Y3Al5O12:Ce3+ (YAG: Ce) phosphor‐based phosphor‐in‐ceramics (PiC) converter with luminous efficacy as high as 190 lm W−1 is fabricated. The ultralow temperature enables the PiC converter to be further combined with red‐emitting CaAlSiN3:Eu2+ (CASN:Eu), delivering a color‐rendering index of 92. The cold‐sintered CaF2 nanoceramic demonstrates great potential as a general solution for next‐generation high‐power LED lighting.
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