期刊
ACS APPLIED ELECTRONIC MATERIALS
卷 2, 期 8, 页码 2651-2657出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaelm.0c00512
关键词
YAGG:Ce phosphor; composite ceramic; green color converter; high luminescence efficiency; laser lighting
资金
- National Natural Science Foundation of China [51702339]
Thermally robust phosphor ceramics are an ideal color converter for high-power laser lighting applications. However, high-quality white light is difficult to achieve due to the absence of green and red emission materials. AnY(3)Al(5-x)Ga(x)O(12):Ce3+ (YAGG:Ce3+) ceramic can emit green light, while the strong oxidizing atmosphere is needed to suppress the Ga evaporation during the high-temperature fabrication process, which can seriously decrease the luminescence efficiency. To enable the green-emitting YAGG:Ce3+ material for laser lighting application, we report a composite phosphor ceramic for which the first achieved fine-grained YAGG:Ce3+ phosphor powders were dispersed into a YAG ceramic matrix (YAGG:Ce-YAG). The transmittance of the YAGG:Ce-YAG ceramic can reach 62% at a range of 500-800 nm owing to the similar refractive index and structure of two phases. The resulting phosphor ceramic also exhibits a high external quantum efficiency (EQE = 68.3%) and excellent thermal stability (luminescence intensity: 90% retention at 200 degrees C) close to those of the original phosphor powders. Furthermore, due to the superior thermal conductivity of the YAGG:Ce-YAG phosphor ceramic (9.4 Wm(-1) K-1 at room temperature), a high luminous emittance of 700 lm/mm(2) can be achieved under an excitation of 8.2 W/mm(2) blue laser light. The achieved YAGG:Ce-YAG phosphor ceramic shows a promising application as the green color converter for high-power laser lighting.
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