The effect of the porosity on the Al2O3-YAG:Ce phosphor ceramic: Microstructure, luminescent efficiency, and luminous stability in laser-driven lighting

Solid-state laser lighting (SSL) fabricated by integrating laser diode with phosphor is a new development to achieve high luminance. Because of the high temperature caused by the laser, the phosphor-conversion apparatus is demanded to possess excellent thermal properties. In this paper, we utilized...

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Bibliographic Details
Published in:Journal of alloys and compounds 2019-05, Vol.785, p.125-130
Main Authors: Liu, Zehua, Li, Shuxing, Huang, Yihua, Wang, Lujie, Zhang, Hui, Jiang, Rongrong, Huang, Fan, Yao, Xiumin, Liu, Xuejian, Huang, Zhengren
Format: Article
Language:English
Subjects:
Aluminum oxide
CCT
Ceramics
Color temperature
Composite ceramics
CRI
High temperature
Laser lighting
Lasers
Lighting
Luminescent efficiency
Phosphors
Plasma sintering
Porosity
Semiconductor lasers
Solid state lasers
Spark plasma sintering
Thermal conductivity
Thermodynamic properties
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Summary:Solid-state laser lighting (SSL) fabricated by integrating laser diode with phosphor is a new development to achieve high luminance. Because of the high temperature caused by the laser, the phosphor-conversion apparatus is demanded to possess excellent thermal properties. In this paper, we utilized spark plasma sintering (SPS) to prepare the Al2O3-YAG:Ce phosphor ceramics with outstanding performances. Due to the high thermal conductivity and high transmittance, a high saturation input power (32 W/mm2) can be achieved for the sample with the lowest porosity. The correlated color temperature (CCT) and color rendering index (CRI) of composite ceramics with the lowest porosity are stable as the input power increases from 0.7 W/mm2 to 30.8 W/mm2. Nevertheless, the sample with the highest porosity shows the highest luminescence efficiency (305 lm/W) and luminous emittances (1796 lm/mm2), which can be ascribed to the scattering of the pore. •The Al2O3-YAG:Ce ceramics with different porosity were prepared.•The relationship between the luminous efficiency and the porosity is studied.•A stable CCT and CRI can be obtained for the ceramic with the low porosity.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2019.01.175