An optimized phosphor model coupled with thermal and optical behavior and a thereof ring-shaped phosphor convertor for improving thermal uniformity in laser illuminations. (May 2020)

• Record Type: Journal Article
• Authors: Ding, Xinrui; Li, Mu; Liang, Yifu; Tang, Xueting; Yu, Binhai; Li, Zongtao
• Is Part Of: International communications in heat and mass transfer. Volume 114(2020:May)
• Publication Date: 2020-05
• Subjects: Laser illumination -- Theoretical model -- Phosphor heat generation -- Thermal management; Heat -- Transmission -- Periodicals; Mass transfer -- Periodicals; Chaleur -- Transmission -- Périodiques; Transfert de masse -- Périodiques; Heat -- Transmission; Mass transfer; Periodicals; 621.4022
• DOI: 10.1016/j.icheatmasstransfer.2020.104552
• Languages: English
• ISSNs: 0735-1933

Abstract

Abstract: 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.