Abstract The surface modification on the β-sialon:Eu 2+ phosphor particles was successfully achieved by the SiO 2 coating via a sol-gel method. The photoluminescence (PL) intensity of the phosphor was effectively enhanced and dominantly depending on the homogeneity of the SiO 2 coating. It was found that more homogeneous and smooth SiO 2 coating was responsible for higher PL intensity. The strongest emission intensity was obtained after the SiO 2 homogenously coating under an optimized preparation condition of tetraethoxysilane (TEOS):H 2 O = 1:1 in molar ratio by improving ∼39% of intensity compared to that of the uncoated β-sialon:Eu 2+ phosphor, due to effective elimination on the surface groups of the phosphor particles. However, with increasing the molar ratio of TEOS:H 2 O, the PL intensity of the coated phosphor became deteriorated owing to the poor homogeneity in the coating layer, even became lower than that of the uncoated sample when TEOS:H 2 O = 1:40 in molar ratio. This technique would be potentially applied in various phosphors assembling for the white light-emitting diodes by significantly improving their photoluminescence efficiencies.

中文翻译：

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β-sialon:Eu 2+ 荧光粉颗粒上SiO 2 涂层的表面改性显着提高了光致发光效率

摘要 采用溶胶-凝胶法通过SiO 2 涂层成功实现了β-sialon:Eu 2+ 荧光粉颗粒的表面改性。磷光体的光致发光 (PL) 强度得到有效增强，并且主要取决于 SiO 2 涂层的均匀性。发现更均匀和光滑的 SiO 2 涂层是导致更高 PL 强度的原因。在四乙氧基硅烷 (TEOS):H 2 O = 1:1 摩尔比的优化制备条件下均匀涂覆 SiO 2 后获得最强的发射强度，与未涂覆的 β-赛隆相比，强度提高了约 39%： Eu 2+ 磷光体，由于有效消除了磷光体颗粒的表面基团。然而，随着 TEOS:H 2 O 摩尔比的增加，当TEOS:H 2 O = 1:40 摩尔比时，涂层磷光体的PL强度由于涂层均匀性差而恶化，甚至低于未涂层样品的PL强度。通过显着提高白光发光二极管的光致发光效率，该技术将潜在地应用于组装白光发光二极管的各种荧光粉。