Photoluminescence properties of (Y1-xCex)(3)Al5O12 (x=0.005-0.03) nanophosphors and transparent ceramic by a homogeneous co-precipitation method
Photoluminescence properties of (Y1-xCex)(3)Al5O12 (x=0.005-0.03) nanophosphors and transparent ceramic by a homogeneous co-precipitation method
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均匀共沉淀法研究(Y1-xCex)(3)Al5O12 (x=0.005-0.03)纳米荧光粉和透明陶瓷的光致发光性能
DOI：
10.1016/j.jlumin.2018.10.081
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发表时间：
2019
影响因子：
3.6
通讯作者：
Qi Xiwei
中科院分区：
文献类型：
--
作者：
Li Jinsheng;Han Xiumei;Wu Lei;Sun Xudong;Qi Xiwei
使用均匀共沉淀工艺均匀共沉淀细小且分散的（Y1-xCex）3Al 5 O 12（x = 0.005-0.03）纳米荧光粉。当激发波长λ ex = 455 nm时，YAG：Ce荧光粉在475-650 nm范围内均表现出较强的发光，最大发光波长为550 nm。随着煅烧温度的升高，荧光粉的结晶度提高，表面缺陷减少，发光强度增强。Ce 3+的猝灭浓度为1.5at%，猝灭机制为Ce-Ce相互作用和晶格缺陷。荧光粉的荧光寿命随Ce浓度和温度的增加而降低。该机理受表面缺陷和基体缺陷的共同影响。所得YAG：Ce粉体具有良好的烧结活性，可在真空条件下烧结成透明陶瓷。与荧光粉相比，透明陶瓷具有更强的发光性能和更短的荧光寿命。
Fine and dispersed (Y1−xCex)3Al5O12(x = 0.005–0.03) nanophosphors were co-precipitated uniformly using a homogeneous co-precipitation process. With an excitation wavelength λexof 455 nm, the YAG:Ce phosphors showed strong luminescence with maxima at 550 nm in the range of 475–650 nm. The emission intensity becomes stronger due to the improved crystallinity and decreased surface defects of the resultant phosphors with increasing calcination temperatures. The quenching concentration of Ce3+was 1.5 at% and the quenching mechanism was Ce–Ce interactions and lattice defects. The fluorescence lifetime of the phosphors decreased with increasing Ce concentrations and temperatures. The mechanism is influenced by defects both in surface and body. The resultant YAG:Ce powders showed an excellent sintering activity and can be sintered into transparent ceramic under vacuum technique. Compared with the phosphors, the transparent ceramic exhibits stronger luminescence properties and shorter fluorescence lifetime.