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 shu

Temperature Dependence of Silica Coated CaAl₁₂O₁₉:Mn⁴⁺ Phosphor

1.
Department of Materials Science and Engineering, College of Materials and Energy, Guangdong Provincial Engineering Technology Research Center for Optical Agriculture, South China Agricultural University, Guangzhou 510642, China

Corresponding author: LIU Ying-Liang, LEI Bing-Fu,
Received Date: 22 September 2014
Available Online: 9 July 2015
Fund Project: 国家自然科学基金项目(No.21171071,21371062) (No.21171071,21371062)广东省自然科学基金团队项目(No.S2013030012842)资助。 (No.S2013030012842)

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.
- sol-gel method;silica coated;CaAl₁₂O₁₉:Mn⁴⁺;temperature dependence
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沈阳化工大学材料科学与工程学院沈阳 110142

Temperature Dependence of Silica Coated CaAl12O19:Mn4+ Phosphor

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通讯作者: 陈斌, bchen63@163.com

Temperature Dependence of Silica Coated CaAl₁₂O₁₉:Mn⁴⁺ Phosphor