ZnS∶Ag纳米发光材料的制备及光谱性质  

Preparation and Spectrum Properties of ZnS∶Ag Nanocrystals

作　　者：曲华[1] 曹立新[1] 苏革[1] 柳伟[1] 姜代旬[1] 董博华[1] 孙远光[1] 

机构地区：[1]中国海洋大学材料科学与工程研究院,山东青岛266100

出　　处：《光谱学与光谱分析》2009年第2期305-308,共4页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(50672089);山东省优秀中青年科学家奖励基金项目(2006BS04034)资助

摘　　要：以简单的化学试剂和实验过程,采用水热法制备出ZnS∶Ag纳米发光材料。X射线衍射结果表明,产品均为结晶良好的ZnS立方闪锌矿结构。通过谢乐公式估算的结果表明,颗粒尺寸随反应温度的升高而呈非线性增长。透射电镜结果表明,产品基本为近球形,大小与估算结果吻合。通过发射光谱和激发光谱对产品的光学性质进行研究,发射峰位于450 nm左右,归属于硫空位相关的电子陷阱施主和银相关的空穴陷阱受主的复合;激发峰位于333 nm左右,归属于ZnS基质的带边吸收。反应温度和时间对产品的发光强度影响较大。固定反应时间为6 h,随着反应温度的提高,产品的发光强度呈现增强-减弱-增强的趋势;固定反应温度为200℃,随着反应时间的延长,产品的发光强度先增强后减弱。在200℃反应6 h时产品具有很好的发光强度。In the present paper, ZnS ： Ag nanoparticles were prepared with simple chemicals by hydrothermal method. XRD patterns indicated that the products have cubic zinc blende crystal structure. The particle diameters were calculated using the Scherer＇s formula, and the particle size showed a nonlinear increase with the rise of reaction temperature. TEM images demonstrated the approximate sphere shapes of products, and the crystal sizes approached the estimated ones respectively. The luminescence properties were investigated with PL and PLE spectra. Emission peaks were at about 450 nm. This emission was ascribed to the recombination between the sulfur vacancy-related electron trap donor having an energy level just below the conduction band and the Ag-related hole trap acceptor above the valence band. Excitation peaks were at about 333 nm, and the excitation was attributed to the near-band-edge absorption of ZnS matrix. The luminescence intensity was strongly influenced by the reaction temperatures and time. It increased, decreased, and then increased again with the rise of reaction temperature, and increased then decreased with the increase in reaction time. ZnS ： Ag nanoparticles synthesized at 200 ℃ for 6 hours have a well luminescence intensity.

关 键 词：ZnS∶Ag 水热法 发光 纳米颗粒 

分 类 号：O611.4[理学—无机化学]