期刊
SOLID STATE SCIENCES
卷 65, 期 -, 页码 88-94出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.solidstatesciences.2017.01.006
关键词
Phosphor; Surface coating; Water resistance
资金
- Science & Technology Pillar Program of Hubei Province [2015BAA105, 2014BCB034]
- National Natural Science Foundation of P.R. China [51374155]
- National Innovation and Entrepreneurship Training Project of Local University Students of P.R. China [201310490008, 20141049047, 20141049043]
In this paper, a heterogeneous precipitation method utilizing urea hydrolysis was adopted to coat a SiO2 layer on the surface of SrAl2O4:Eu2+, Dy3+ long persistence phosphors. To avoid phosphor hydrolysis in a water-containing coating medium, the hydrolysis and polymerization reactions of tetraethyl orthosilicate (TEOS) were concerned and carried out. The crystal phases, surface morphologies, hydrolysis stability and water resistance on afterglow properties of coated phosphors were investigated. Scanning electron microscopy, energy dispersive spectrum analysis, transmission electron microscope and Fourier transform infrared spectrum results confirmed that a continuous, uniform and compact SiO2 coating layer was successfully obtained on the phosphors surface. A theoretical coating amount of 5% or higher was found to be good for hydrolysis stability. Photoluminescence results revealed the coated phosphors showed much better water resistance on afterglow properties than the uncoated phosphor. We also discussed and proposed the hydrolysis restriction mechanism of SrAl2O4:Eu2+, Dy3+ in the water-containing coating medium. (C) 2017 Elsevier Masson SAS. All rights reserved.
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