期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 42, 期 2, 页码 608-615出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2021.10.035
关键词
Laser lighting; Luminous exitance; Composite film; Spot limitation; YAG:Ce
资金
- National Natural Science Foundation of China [NSFC51802083, 51772076]
- Danish Energy Technology Development and Demonstration program [EUDP64017-0588]
- Key Research Foundation of Henan Provincial Department of Education [20A430018]
The study focuses on a highly scattering YAG:Ce/glass composite film with a porous microstructure, which shows high luminous efficacy and luminous exitance under blue laser excitation. The glass/phosphor interfaces and introduced pores in the composite film act as scattering centers to confine emission area effectively, demonstrating great potential for use in high-luminance laser lighting.
One major benefit of laser lighting is the possibility to achieve very high luminance. In phosphor-converted laser lighting systems, a blue (pump) laser can be focused into a very small spot. However, after excitation of the phosphor, the white-light-emitting area usually increases considerably, which reduces the luminance parameter substantially. Herein, we design and investigate a highly scattering YAG:Ce/glass composite film with a porous microstructure. Both the glass/phosphor interfaces and the introduced pores act as scattering centers, which can confine the emission area effectively. The relationship between the spot size and the microstructure (porosity, phosphor-particle size, thickness) is elucidated. Under excitation with blue laser, the composite film shows a uniform white-light emission with high luminous efficacy (230 lm/W) and high saturation threshold (> 40 W/mm(2)), thus achieving a high luminous exitance of similar to 1239 lm/mm(2). With above excellent properties, the designed composite films show great potential for use in high-luminance laser lighting.
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