Preparation of SrAl2O4@SiO2 Core@shell Structure Composites and Their Luminescence and Anti-hydrolysis Property

doi:10.7503/cjcu20250214

Abstract

Abstract:

Hydrolysis in alkaline condition and inferior temperature resistance property were two disadvantages of SrAl₂O₄∶Eu²⁺，Dy³⁺（SrAl₂O₄） long persistence phosphors. To address these two issues， this study employed ethylene glycol as a non-aqueous reaction medium to cover a SiO₂ layer on the SrAl₂O₄ surface. This strategy effectively isolated the SrAl₂O₄ matrix from water molecules， hence avoiding the side hydrolysis reactions during the coating process. After careful study， the optimized coating process was determined as follows： solution pH value was 11.0， reaction temperature was 80.0 ℃， reaction time was 2.0 h， Na₂SiO₃ dosage（mass） was 6.0% of SrAl₂O₄ powders. Under the optimized condition， a dense SiO₂ layer with the thickness of 60 nm was seamlessly coated on SrAl₂O₄ surface， leading to a SrAl₂O₄@SiO₂ core@shell composite. According to X-ray diffraction pattern， the crystal phase of the SrAl₂O₄ was not changed during the coating process. Compared to the pristine SrAl₂O₄， the luminescence intensity of composites was only reduced 11.2%， while the anti-hydrolysis property was largely improved. In practical application， the bright green color could be easily observed by naked eyes after the composite was washed for 6 h in the presence of detergent. The thermogravimetric analysis indicated the remained weight of SrAl₂O₄@SiO₂ composites was 93.7%（mass fraction） after calcinated at 800 ℃. This study provided a novel way to improve the anti-hydrolysis property and high-temperature resistance property of SrAl₂O₄ without remarkably sacrificing their luminescence property， and this is beneficial for their real application in fire protection.

Key words: Surface coating, Luminescent material, Core@shell structure, Anti-hydrolysis property, Thermal stability

CLC Number:

O614.2

TrendMD:

FU Jialin, ZHU Yufeng, YANG Kaiyuan, GUO Yongmei, LU Yan, YAO Tongjie. Preparation of SrAl₂O₄@SiO₂ Core@shell Structure Composites and Their Luminescence and Anti-hydrolysis Property[J]. Chem. J. Chinese Universities, 2025, 46(10): 20250214.

Figures/Tables 10

References 27

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Preparation of SrAl₂O₄@SiO₂ Core@shell Structure Composites and Their Luminescence and Anti-hydrolysis Property

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