水热法合成ZnS∶Au,Cu超细X射线发光粉  

X-Ray Excited Luminescence Property of ZnS∶Au,Cu Fine Particles Synthesized by Hydrothermal Method

作　　者：新梅[1,2] 曹望和[1] 

机构地区：[1]大连海事大学光电子技术研究所,辽宁大连116026 [2]大连民族学院理学院物理系,辽宁大连116600

出　　处：《光谱学与光谱分析》2009年第8期2272-2275,共4页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(10374011);大连民族学院青年基金项目资助

摘　　要：报道了水热法合成的高强度ZnS∶Au,Cu超细X射线发光粉及其光致发光(PL)和X射线激发发光(XEL)的光谱特性。200℃水热处理12h直接合成样品的纳米晶粒约15nm,尺寸分布窄,分散性好,具有纯立方相的类球形结构。氩气保护下1000℃焙烧1h后的样品存在一定的团聚,但团聚后尺寸为1～2μm,为超细X射线发光粉,此时样品为纯六角相的类球形为主的结构。所有样品的PL和XEL光谱均为宽带谱,水热法直接合成样品的XEL强度最强时,样品的Cu/Zn,Au/Cu比值分别为3×10-5和2。在此比值条件下,1000℃焙烧1h样品的XEL发光最强,此时其2个峰值分别位于445和513nm,且与未焙烧前相比强度增强了10倍左右。另外通过比较PL光谱与XEL光谱特性,讨论了PL和XEL光谱的发光机理和其不同的激发机制。Highly luminescent ZnS ： Au, Cu X-ray phosphor fine particles synthesized by hydrothermal method is reported ：for the first time and its photoluminescence （PL） and X-ray excited luminescence （XEL） properties were studied in detail. With direct hydrothermal treatment at 200℃ for 12 h, the average gain size of samples is about 15 nm; the synthesized sphere-like nanocrystals with well dispersity and narrow gain size distribution show cubic structure. After baking in argon at 1 000℃ for lh the sample agglomerate size is about 1-2μm and the roughly spherical fine particles show pure hexagonal structure. The PL and XEL spectra of all the samples show a broad emission band and an intense emission band in the range of 400-600 nm. The maximum XEL intensity of sample directly synthesized by hydrothermal treatment was observed when Cu/Zn and Cu/Al were 3 × 10 ^-5 and 2, respectively. In this condition, the strongest PL emission was observed for the direct synthesized sample being further baked in argon at 900 ℃ for 1 h and the PL peak was centered at about 529 nm. The strongest XEL emission was observed for the direct synthesized sample being further baked in argon at 1 000 ℃ for lh and the XEL peak was centered at about 445 and 513 nm, respectively. In the meantime, the XEL intensity increased about ten times compared with that directly synthesized without baking. The difference between PL and XEL spectra is due to its different excitation mechanism. The 1 mechanism and different excitation mechanism of PL and XEL were discussed. The red shift of XEL spectrum with directly synthesized sample was observed with increasing the Cu/Zn. The reason can also be explained by the luminescence mechanism and excitation mechanism of XEL.

关 键 词：ZnS∶Au Cu 水热法 X射线激发发光 

分 类 号：O469[理学—凝聚态物理]