中文摘要：

报道了水热法（200℃）直接合成的ZnS∶Cu,Al纳米晶及其发光特性。ZnS∶Cu,Al纳米晶粒径约15 nm,尺寸分布窄,分散性好,具有纯立方相的类球形结构。借助X射线能谱法（EDX）和原子吸收光谱仪,研究了样品中S,Zn和Cu的含量并详细研究了光致发光（PL）光谱的特性。结果证明存在大量Zn空缺,Cu离子经过水热处理后已掺入到ZnS基体中。PL光谱特性为：样品的激发谱为宽带谱,337 nm激发时样品发出很强的绿光,370~420 nm之间任意波长激发时,发射谱均为宽带谱,且它们基本重合。表明此材料作为近紫外（370~410 nm）发光二极管（（n）-UV（370~410 nm）LED）用荧光粉及全色荧光粉具有很大的应用潜力。样品在375 nm激发下全色宽带发射谱是460,510和576 nm带光谱的高斯叠加。当Cu/Zn,Cu/Al和S/Zn分别为3×10-4,2和3.0时,于室内照明条件下肉眼可观察到白色发光。

英文摘要：

ZnS∶Cu,Al nanocrystals were synthesized by a hydrothermal method at 200 ℃ and their optical properties were studied.The analysis of XRD and TEM show that the spherical-like nanocrystals had a grain size of approximately 15 nm and were well dispersed,with a zinc blende structure.The energy dispersive X-ray spectroscopy（EDX） and atomic absorption spectrometry were applied to the analysis of S,Zn and Cu content in the sample.The results proved that a large number of zinc vacancies exist and Cu is incorporated into the sample lattice.The photoluminescence（PL） spectra were investigated.The PL mechanism is discussed.The excitation spectrum is broad.Under 337 nm excitation the sample emits bright green light.Under 370-410 nm excitation the sample emits white light.The broad emission spectra are almost coincident with any excitation wavelength of between 370 and 410 nm making them attractive as conversion phosphors for LED applications and full-color fluorescence display devices.The emitted white light under 375 nm excitation was found to be the result of blue,green,and orange emission bands.For Cu/Zn,Cu/Al and S/Zn molar ratios of 3×10-4,2 and 3,respectively,the near blue white light can be observed with the naked eye in daylight.