High lumen density of Al2O3‐LuAG: Ce composite ceramic for high‐brightness display. Issue 7 (9th February 2021)

• Record Type: Journal Article
• Authors: Zhang, Qi; Zheng, Ruilin; Ding, Jianyong; Cui, Peng; Wang, Zhongyue; Lv, Peng; Wei, Wei
• Is Part Of: Journal of the American Ceramic Society. Volume 104:Issue 7(2021)
• Page Start: 3260
• Page End: 3268
• Publication Date: 2021-02-09
• Subjects: green emission -- high‐brightness display -- lumen density -- luminescent ceramic; Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.17672
• Languages: English
• ISSNs: 0002-7820

Abstract

Abstract: Thermally robust and highly efficient green‐emitting luminescent ceramics are gradually attracting great attention as promising phosphors using in high‐brightness laser phosphor display to reduce serious speckle noise as well as high cost. However, lumen density is still seriously restricting their potential applications especially under high‐power density laser due to insufficient absorption of blue laser and significant thermal quenching. Here, we report an Al2 O3 ‐LuAG: Ce composite ceramic phosphor (CCP) for high‐brightness laser phosphor display. Owing to good optical properties and high thermal conductivity of Al2 O3, the Al2 O3 ‐LuAG: Ce CCP shows high photoluminescence quantum yield (79.6%), low thermal quenching (only 3.2% loss in luminescence at 200°C), and high thermal conductivity (18.9 W·m −1 ·K −1 ). Moreover, the Al2 O3, as scattering centers, enhances the Rayleigh–Mie scattering of the blue laser, and hence the absorption of the Al2 O3 ‐LuAG: Ce CCP exhibits a remarkable improvement (~2.3 times) at 450 nm. Finally, with optimized thickness (0.3 mm) of Al2 O3 ‐LuAG: Ce CCP, an excellent luminous efficiency (216 lm·W −1 ) and outstanding lumen density (6129 lm·mm −2 ) of the green‐emitting light source was obtained by driving under a high‐power density (28.33 W·mm −2 ) blue laser. All of those validate the suitability of the Al2 O3 ‐LuAG: Ce CCP for high‐brightness display.