An optimized phosphor model coupled with thermal and optical behavior and a thereof ring-shaped phosphor convertor for improving thermal uniformity in laser illuminations

Due to the high energy density of laser diode (LD), the fluorescent convertor always suffers from serious overheating problems, such as thermal quenching, significant efficiency drop or even material carbonization failure. In this work, we improved the current optical-thermal model by coupling the o...

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Bibliographic Details
Published in:International communications in heat and mass transfer 2020-05, Vol.114, p.104552, Article 104552
Main Authors: Ding, Xinrui, Li, Mu, Liang, Yifu, Tang, Xueting, Yu, Binhai, Li, Zongtao
Format: Article
Language:English
Subjects:
Laser illumination
Phosphor heat generation
Theoretical model
Thermal management
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Summary:Due to the high energy density of laser diode (LD), the fluorescent convertor always suffers from serious overheating problems, such as thermal quenching, significant efficiency drop or even material carbonization failure. In this work, we improved the current optical-thermal model by coupling the optical behavior of red (nitride)/yellow (YAG) phosphor and thermal conductivity of different hybrid particles concentrations. According to the theoretical analysis, the thermal sensitive concentration zone was revealed. To avoid the hotspot occurs, a ring-shaped phosphor convertor with two different concentrations was developed. Results showed that the convertor with high-concentration center could reduce the max temperature by 9.4% without obvious optical power loss. Some further research suggestions were also proposed to improve the thermal performances of the laser illumination.
ISSN:0735-1933
1879-0178
DOI:10.1016/j.icheatmasstransfer.2020.104552