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Surface modification of SrAl_2O_4:Eu~(2+), Dy~(3+) phosphors using silica encapsulation

机译:SRAL_2O_4的表面改性:EU〜(2+),DY〜(3+)磷光体使用二氧化硅封装

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Silica encapsulated phosphors SrAl_2O_4:Eu~(2+), Dy~(3+) have been synthesized by non-homogeneous phase coring method, in which glycerol was firstly used as dispersion medium and hyper-dispersant was introduced as additive. IR, BET and scanning electron microscopy (SEM) demonstrated that a dense layer of silica was formed on the surface of phosphor SrAl_2O_4:Eu~(2+), Dy~(3+). The results showed that the encapsulated phosphors possess good properties in water-resistance, heat-resistance and dispersibility when encapsulation amount reached 8 wt. %. Moreover, the photoluminescence intensity of phosphors SrAl_2O_4:Eu~(2+), Dy~(3+) was improved apparently after surface modification. All results revealed that silica encapsulation would effectively improve alkaline earth aluminates phosphors' properties and using glycerol as the dispersion medium is helpful to silica encapsulation.
机译:二氧化硅封装磷光体SRAL_2O_4:EU〜(2+),通过非均匀相芯方法合成DY〜(3+),其中首先使用甘油作为分散介质,并将超分散剂作为添加剂引入。 IR,BET和扫描电子显微镜(SEM)表明,在磷光体SRAL_2O_4的表面上形成致密的二氧化硅层:EU〜(2+),DY〜(3+)。结果表明,当封装量达到8重量%时,封装的磷光体在耐水性,耐热性和分散性方面具有良好的性能。 %。此外,磷光体的光致发光强度SRAL_2O_4:EU〜(2+),表面改性后显然改善了DY〜(3+)。所有结果表明,二氧化硅封装将有效地改善铝土铝磷酸酯的性能,并使用甘油,因为分散介质有助于二氧化硅包封。

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