采用水热法直接合成了ZnS∶Cu,Al纳米荧光粉,并且系统研究了加入表面活性剂在不同S/Zn下,清洗样品和不清洗样品的结晶性、傅立叶红外光谱(FT-IR)及光致发光(PL)光谱.XRD和TEM测试结果表明:合成纳米晶为纯立方相结构,球形纳米晶尺寸约15 nm, 尺寸分布窄,分散性好.未清洗样品的结晶性比清洗样品的好,且加入表面活性剂和未清洗都导致粒径增大,影响纳米材料的表面态.改变[S~(2-)]/[Zn~(2+)]物质的量比、清洗和加入表面活性剂都会影响材料的PL强度.这说明其发光机理为紫外光激发材料表面的发光中心,即PL强度决定于纳米材料的表面态.
ZnS∶Cu,Al nanocrystals were synthesized by a hydrothermal method at 200 ℃. The photo luminescence (PL) spectra,FT-IR spectra and crystallinity of the rinsed and unrinsed samples under various molar ratios of S/Zn and effect of surfactant have been systematically investigated. The spherical-like nanocrystals had a grain size of approximately 15 nm and were well dispersed, with a zinc blende structure. Crystallization and particle size of samples decreased after the rinsed process. The PL emission intensity of unrinsed sample stronger than rinsed sample, but at low ratio of S/Zn, the enhanced emission intensity is more significantly. In addition, the surfactants also affect the surface state of nanocrystals and PL emission spectra. The results show that the luminescence mechanism of PL spectra attribute to the luminescence centers on surface of materials detected by UV light, so the surface state of nanomaterials determine the PL emission intensity and affect the crystallization of nanocrystals.
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