Shi Yurong, Zhu Ge, Mikami Masayoshi, Shimomura Yasuo, Wang Yuhua
Key Laboratory for Special Function Materials and Structural Design of the Ministry of Education, School of Physical Science and Technology, Lanzhou University, Lanzhou, 730000, China.
Dalton Trans. 2015 Jan 28;44(4):1775-81. doi: 10.1039/c4dt03144j.
A novel Ce(3+) activated Lu3MgAl3SiO12:Ce phosphor was synthesized and found to crystallize in the garnet structure. The crystal structure of the synthesized phosphor has been characterised by X-ray diffraction and Rietveld refinement. Both room and high temperature photoluminescence spectra are utilized to investigate the luminescence properties and crystal field splitting. The high temperature quenching of these phosphors and their quantum efficiency (QE) are also studied using both the prepared YAG:Ce and the commercial YAG:Ce phosphor named P46-y3 as the reference. Upon excitation with blue light, the composition-optimized Lu3MgAl3SiO12:Ce phosphor exhibited strong yellow light with a high QE of 81.2% and better thermal stability than that of the commercial phosphor. The results indicate that the Lu3MgAl3SiO12:Ce phosphor can serve as a candidate for blue chip LEDs.
合成了一种新型Ce(3+)激活的Lu3MgAl3SiO12:Ce荧光粉，发现其结晶为石榴石结构。通过X射线衍射和Rietveld精修对合成荧光粉的晶体结构进行了表征。利用室温及高温光致发光光谱研究了发光性能和晶体场分裂。还以制备的YAG:Ce和市售名为P46-y3的YAG:Ce荧光粉为参考，研究了这些荧光粉的高温猝灭及其量子效率（QE）。在用蓝光激发时，成分优化的Lu3MgAl3SiO12:Ce荧光粉发出强黄光，量子效率高达81.2%，且热稳定性优于市售荧光粉。结果表明，Lu3MgAl3SiO12:Ce荧光粉可作为蓝光芯片发光二极管的候选材料。
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