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Journal of Advanced Ceramics 2022, 11(12): 1889-1900 https://doi.org/10.1007/s40145-022-0654-7
Research Article | Open Access | Issue | Published: 30 September 2022

Unique sandwich design of high-efficiency heat-conducting phosphor-in-glass film for high-quality laser-driven white lighting

Show Author's Information Yang PENG1,  Zikang YU1,  Jiuzhou ZHAO1,  Qing WANG2,  Jiaxin LIU2,  Bo SUN1,  Yun MOU2( ),  Mingxiang CHEN2
School of Aerospace Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
Keywords:
heat dissipation, laser-driven lighting, phosphor-in-glass (PiG) film, sandwich structure, color quality
Cite this article:
PENG Y, YU Z, ZHAO J, et al. Unique sandwich design of high-efficiency heat-conducting phosphor-in-glass film for high-quality laser-driven white lighting. Journal of Advanced Ceramics, 2022, 11(12): 1889-1900. https://doi.org/10.1007/s40145-022-0654-7
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Abstract Full text Electronic supplementary material About this article

Multi-color phosphor-in-glass (PiG) film has been considered as a promising color converter in high-quality laser lighting owing to its outstanding merits of phosphor versatility, tunable luminescence, and simple preparation. However, the opto-thermal properties of PiG film are severely affected by the photon reabsorption and backward scattering of phosphor structure and the heat conduction of substrate. Herein, a unique sandwich design of phosphor structure was introduced in the multi-color PiG film for high-quality laser lighting. By elaborately synthesizing the borosilicate glass with low glass transition temperature (Tg), similar expansion coefficient, and high refractive index (RI), the sandwiched PiGs were prepared by sintering (~600 ℃) broadband green and red phosphor glass films on the double sides of sapphire. The green and red PiG films were tightly coated on the sapphire with no delamination and maintained higher luminescence intensity than raw phosphors at high temperatures. By simultaneously coupling photon reabsorption and backward scattering, the sandwiched green PiG film–sapphire–red PiG film (G–S–R PiG) yields a high-quality white light with a high luminous efficacy of 163 lm/W and an excellent color rendering index (CRI) of 85.4 under a laser power of 2.4 W, which are the best comprehensive results yet reported. Benefiting from the ingenious sandwich design with heat-conducting sapphire and thin PiG films, the G–S–R PiG displays low working temperatures (< 200 ℃) under high-power laser excitation. This work reveals the role of sandwiched phosphor structure in photon loss and heat dissipation, which provides a new strategy to design PiG films for high-quality laser lighting.


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Electronic supplementary material
About this article

Unique sandwich design of high-efficiency heat-conducting phosphor-in-glass film for high-quality laser-driven white lighting

Show Author's information Yang PENG1, Zikang YU1, Jiuzhou ZHAO1, Qing WANG2, Jiaxin LIU2, Bo SUN1, Yun MOU2( ), Mingxiang CHEN2
School of Aerospace Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China

Abstract

Multi-color phosphor-in-glass (PiG) film has been considered as a promising color converter in high-quality laser lighting owing to its outstanding merits of phosphor versatility, tunable luminescence, and simple preparation. However, the opto-thermal properties of PiG film are severely affected by the photon reabsorption and backward scattering of phosphor structure and the heat conduction of substrate. Herein, a unique sandwich design of phosphor structure was introduced in the multi-color PiG film for high-quality laser lighting. By elaborately synthesizing the borosilicate glass with low glass transition temperature (Tg), similar expansion coefficient, and high refractive index (RI), the sandwiched PiGs were prepared by sintering (~600 ℃) broadband green and red phosphor glass films on the double sides of sapphire. The green and red PiG films were tightly coated on the sapphire with no delamination and maintained higher luminescence intensity than raw phosphors at high temperatures. By simultaneously coupling photon reabsorption and backward scattering, the sandwiched green PiG film–sapphire–red PiG film (G–S–R PiG) yields a high-quality white light with a high luminous efficacy of 163 lm/W and an excellent color rendering index (CRI) of 85.4 under a laser power of 2.4 W, which are the best comprehensive results yet reported. Benefiting from the ingenious sandwich design with heat-conducting sapphire and thin PiG films, the G–S–R PiG displays low working temperatures (< 200 ℃) under high-power laser excitation. This work reveals the role of sandwiched phosphor structure in photon loss and heat dissipation, which provides a new strategy to design PiG films for high-quality laser lighting.

Keywords: heat dissipation, laser-driven lighting, phosphor-in-glass (PiG) film, sandwich structure, color quality

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Publication history

Received: 05 July 2022
Revised: 16 August 2022
Accepted: 31 August 2022
Published: 30 September 2022
Issue date: December 2022

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© The Author(s) 2022.

Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (51805196 and 51775219), Key Research and Development Program of Hubei Province (2021BAA213 and 2020BAB068), and China Postdoctoral Science Foundation (2021M701308). The authors would like to thank Analytical and Testing Center, Huazhong University of Science and Technology for the support in the XRD, PL, and SEM measurements.

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