Journal
CERAMICS INTERNATIONAL
Volume 46, Issue 11, Pages 17923-17928Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2020.04.101
Keywords
Laser lighting; YAG:Ce; Composite ceramic; Single crystal; Luminescence saturation
Categories
Funding
- National Natural Science Foundation of China [NSFC 51772076, 51802083]
- Danish Energy Technology Development and Demonstration program [EUDP 64017-0588]
- Natural Science Foundation of Fujian Province [2019J05022]
- Scientific Research Foundation of Henan Polytechnic University [B2017-58, T2017-2]
- Postdoctoral Research Sponsorship in Henan Province [19030025]
- China Scholarship Council
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Recent studies revealed that both the Al2O3-Y3Al5O12:Ce (YAG:Ce) composite ceramic (YAG-CC) and single crystalline YAG:Ce (YAG-SC) possess very high luminescence-saturation thresholds (LSTs), which makes them promising for laser lighting applications. The present study is aimed to conduct a comparative investigation between YAG-CC and YAG-SC on aspects of the laser-pumped luminescence and the associated thermal behavior. The colorimetric and photometric properties (e.g. luminous flux/efficacy, correlated color temperature, and color rendering index) were investigated systematically, by conducting the measurements using a custom-built sphere-spectroradiometer system in the transmission mode. It was found that YAG-SC has a superior LST and it could maintain a high luminous efficacy (106 lm/W) under the irradiation of a 15.33 W blue laser, while the YAG-CC saturated at around 7.76 W. Moreover, by combining the thermal imaging data with the spectral variation of the YAG-CC, novel experimental insights into the origin of luminescence saturation were revealed and proposed as the thermally-induced absorption saturation.
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