Open AccessAl2O3-YAG:Ce composite ceramics for high-brightness lighting
Author(s) -
Mengjie Xu,
Jing Chang,
J Wang,
Canbiao Wu,
Fengrui Hu
Publication year - 2019
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.000872
Subject(s) - materials science , phosphor , ceramic , sintering , transparent ceramics , composite number , luminescence , brightness , optics , quantum efficiency , molar ratio , optoelectronics , analytical chemistry (journal) , composite material , biochemistry , chemistry , physics , chromatography , catalysis
LD chips, combined with phosphor converters, are considered as optimum candidates for high brightness lighting. In this work, Al 2 O 3 -YAG:Ce composite ceramics were prepared as the phosphor converters. The sintering temperature and the sintering additives were optimized to obtain the highest quantum efficiency. The effect of the molar ratio of Al 2 O 3 to YAG:Ce on the performance of the ceramics that were excited by the LD chips was studied. The results show that the light extraction efficiency from the ceramic surfaces increases with the increasing molar ratio of Al 2 O 3 to YAG:Ce. Moreover, the improved thermal conductivity caused the ceramics with higher molar ratio of Al 2 O 3 to YAG:Ce show alleviative luminescence saturation and improved reliability.