Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 39, Issue 15, Pages 4965-4971Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2019.07.027
Keywords
MgAl2O4-Ce:GdYAG composite ceramics; Thermal stability; Luminous efficacy; Color coordinates
Categories
Funding
- National key R&D Program of China [2017YFB0310500, 2016YFB0701004]
- National Natural Science Foundation of China [61575212, 61675221, 61775226]
- Strategic Priority Research Program of Chinese Academy of Sciences [XDA22010301]
- key research project of the frontier science of the Chinese Academy of Sciences [QYZDB-SSW-JSCO22]
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High-power light-emitting-diode (LED) lighting has attracted great attention in high-luminance applications. However, the color converters with high stability, high thermal conductivity and high efficiency are scarce. In this work, we developed promising MgAl2O4-Ce:GdYAG composite ceramic color converters in which a broadband yellow-emitting phosphor Ce:GdYAG is combined with a thermally stable spinel phase MgAl2O4. The microstructure, phase composition, photoluminescence and thermal stability were investigated in detail. After being packaged with blue LED, a high luminous efficacy value of 108.41m/W is achieved by the composite ceramic phosphor with the molar ratio (MgAl2O4 to Ce:GdYAG) of 1.0 and the thickness of 0.2 mm, as well as high CRI value of 70 and low CCT value of 4543. The light scattering nature of composite ceramic phosphors makes them an ideal and promising candidate for high-brightness white LEDs.
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