College of Materials , Xiamen University , Xiamen 361005 , P. R. China.
College of Optical and Electronic Technology , China Jiliang University , Hangzhou 310018 , P. R. China.
ACS Appl Mater Interfaces. 2018 May 2;10(17):14930-14940. doi: 10.1021/acsami.8b03168. Epub 2018 Apr 19.
As a next-generation high-power lighting technology, laser lighting has attracted great attention in high-luminance applications. However, thermally robust and highly efficient color converters suitable for high-quality laser lighting are scarce. Despite its versatility, the phosphor-in-glass (PiG) has been seldom applied in laser lighting because of its low thermal conductivity. In this work, we develop a unique architecture in which a phosphor-in-glass (PiG) film was directly sintered on a high thermally conductive sapphire substrate coated by one-dimensional photonic crystals. The designed color converter with the composite architecture exhibits a high internal quantum efficiency close to that of the original phosphor powders and an excellent packaging efficiency up to 90%. Furthermore, the PiG film can even be survived under the 11.2 W mm blue laser excitation. Combining blue laser diodes with the YAG-PiG-on-sapphire plate, a uniform white light with a high luminance of 845 Mcd m(luminous flux: 1839 lm), luminous efficacy of 210 lm W, and correlated color temperature of 6504 K was obtained. A high color rendering index of 74 was attained by adding a robust orange or red phosphor layer to the architecture. These outstanding properties meet the standards of vehicle regulations, enabling the PiG films with the composite architecture to be applied in automotive lighting or other high-power and high-luminance laser lighting.
作为下一代高功率照明技术，激光照明在高亮度应用中引起了极大的关注。然而，适合高质量激光照明的热稳定且高效的颜色转换器却很少。尽管荧光玻璃（PiG）具有多功能性，但由于其导热率低，很少将其应用于激光照明。在这项工作中，我们开发了一种独特的结构，其中荧光玻璃（PiG）薄膜直接在涂有一维光子晶体的高热导率蓝宝石衬底上烧结。具有复合结构的设计型颜色转换器表现出接近原始荧光粉的高内量子效率和高达 90%的优异封装效率。此外，即使在 11.2 W mm 的蓝色激光激发下，PiG 薄膜也能存活。将蓝色激光二极管与 YAG-PiG-蓝宝石板相结合，获得了亮度为 845 Mcd m（光通量：1839 lm）、光效为 210 lm W 和相关色温为 6504 K 的均匀白光，显色指数高达 74。通过向结构中添加坚固的橙色或红色荧光粉层，可以获得这些出色的性能满足车辆法规的标准，使具有复合结构的 PiG 薄膜能够应用于汽车照明或其他高功率和高亮度激光照明。
