Affiliation:
1. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Institute of Functional Materials College of Materials Science and Engineering Donghua University Shanghai 201620 China
2. State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and Devices South China University of Technology Guangzhou 510641 China
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.
Funder
Science and Technology Commission of Shanghai Municipality
Subject
Electrochemistry,Condensed Matter Physics,Biomaterials,Electronic, Optical and Magnetic Materials
Cited by
7 articles.
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