Recent progress on garnet phosphor ceramics for high power solid-state lighting

As the fourth-generation light source, solid-state lighting has developed rapidly in the past 30 years due to its advantages of high efficiency and environmental protection. It is widely used in various scenes such as automobile headlights, projection displays, industrial production, and remote lighting. High-power, high-brightness white light-emitting diodes (LEDs) and laser diodes (LDs) technology put forward new requirements for the service stability of color conversion materials. Garnet phosphor ceramics have emerged with their unique advantages of withstanding high power excitation density and the flexibly tunable spectrum. In this article, the research progress of garnet based phosphor ceramics for high-power solid-state lighting was comprehensively reviewed. Firstly, the band gap and coordination environment regulations of luminescence centers of garnet phosphor were summarized. Secondly, the improvement of luminous efficacy via defects regulation was discussed. Thirdly, the relationship between the geometric design and the lighting performance was elucidated. Fourthly, the characterization methods of phosphor ceramics for laser lighting were introduced and illustrated. Finally, the development trend of garnet phosphor ceramics in solid state lighting and display was prospected.