Citation: ZHANG Hai-Ming, ZHANG Hao-Ran, LIU Ying-Liang, DONG Han-Wu, HUANG Jia-Feng, CHEN Shu-Yi, LEI Bing-Fu. Temperature Dependence of Silica Coated CaAl12O19:Mn4+ Phosphor[J]. Chinese Journal of Inorganic Chemistry, ;2015, 31(8): 1489-1494. doi: 10.11862/CJIC.2015.224
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The CaAl12O19:Mn4+ phosphors coated with amorphous SiO2 were prepared by means of sol-gel method and were characterized by XRD, TEM, EDS, FTIR and photoluminescence spectra. The X-ray diffraction results showed that the as-prepared powders appeared an amorphous silica feature wide peak around 22° which showing increasing intensity with increasing amount of coated SiO2. FTIR analysis found obvious Si-O-Si band of coated samples. The TEM demonstrated that the particle size was about 3~6 μm. After coated, the intensity of excitation and emission spectrum were reduced. It showed that the photostability of the 10% silica coated sample can be effectively improved with minimum loss of emission intensity. The temperature-dependent emission spectra of 50% silica coated and the uncoated samples were investigated from 80 to 400 K, the results found that an anti-quenching phenomenon that the emission intensities increased then decreased at increased temperature, and the coated samples has higher thermal activation energy compared with uncoated sample.
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