HE Yu 1, 3, LIU Kaige 1, XIAO Zhuohao 2, ZHANG Ling 1, ZHOU Chaolan 1, ZENG Shaozhong 1, XIANG Bingxi 1, ZHAI Jianpang 1, KONG Lingbing 1
(1. College of New Materials and New Energies, Shenzhen Technology University, Shenzhen 518118, Guangdong, China; 2. School of Materials Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen 333403, Jiangxi, China; 3. College of Applied Technology, Shenzhen University, Shenzhen 518000, Guangdong, China)
Abstract: As compared with single crystals, transparent ceramics have advantages of simple processing and cost-effectiveness, as the phosphors of next generation solid state lighting. Also, transparent ceramics are superior to glass-based phosphors, due to their stronger mechanical properties, higher heat dissipation capacity, higher conversion efficiency and more available color adjustments. Currently, cerium-doped yttrium aluminum garnets have been the most widely studied as the solid state phosphors, although there are other types of materials, such as oxides (such as spinel) and fluorites (such as CaF2). This paper is aimed to offer a brief introduction on transparent ceramics in the applications of solid-state lighting. Starting from the factors that have strong influence on the luminescence performance of transparent ceramics, the effects of ion doping and second phase on the current solid state phosphors will be overviewed, while the development trend of transparent ceramic phosphors is also prospected. It is strongly believed that, with appropriate modifications, transparent ceramics should be promising candidates as solid state phosphors for next generation lighting and display technologies.
Key words: transparent ceramics; LED; solid state phosphors; LD; color rendering index; correlated color temperature; luminous efficacy; thermal management