煅烧温度对Cu掺杂ZnO纳米粉体的制备及发光性能的影响  

Effect of Calcination Temperature on Preparation and Luminescent Properties of Cu Doped ZnO Nano-powder

作　　者：单民瑜[1] 陈卫星[1] 王丽玲[1] 刘秀兰[1] 

机构地区：[1]西安工业大学材料与化工学院,陕西西安710032

出　　处：《发光学报》2012年第11期1204-1208,共5页Chinese Journal of Luminescence

基　　金：西安-应用材料创新基金(XA-AM-200912)资助项目

摘　　要：在PVA溶液中制备ZnO∶Cu纳米粉体的前驱体,经过煅烧获得ZnO∶Cu纳米粉体,考察煅烧温度对制备过程及发光性能的影响。利用XRD、TEM分析了产物的结构和形貌,XRD分析结果表明,当煅烧温度高于500℃时,可以使PVA完全分解,制备出具有六角纤锌矿结构的ZnO∶Cu粉体。TEM结果表明,粉体呈球形,大小均匀,分散性好,平均粒径为20～25 nm。在342 nm波长光的激发下,在ZnO∶Cu的室温PL光谱中可以观察到两个中心波长位于458 nm和486 nm的较强的蓝光发射峰,经400℃煅烧处理的ZnO∶Cu纳米粉体的蓝光发射最强。煅烧后的ZnO∶Cu只有微弱的绿光发射(510～530 nm),Cu的掺杂使ZnO的绿光发射变为蓝光发射。蓝紫光的发射波长随煅烧温度的升高产生明显的红移,由300℃时的404 nm红移至600℃时的422nm,发射强度随温度升高先增大后减小。The precursors of ZnO∶Cu nano-powder were prepared in PVA aqueous solution.Then the products were obtained by calcining with different temperature.The effect of calcination tempe-rature on preparation and the photoluminescence of the ZnO∶Cu nano-powder was investigated.The products dealed with different temperature were characterized by XRD,TEM and PL.The results of XRD indicated that when the clacination temperature was above 500 ℃,the products had a crystal structure of hexagonal wurtzite,while the polymer PVA decomposed completely.The TEM result showed that the nano-powder was spherical with a uniform size of 20~25 nm and good dispersibility.Two blue emission peaks centered at 458 nm and 486 nm were observed in the room temperature PL spectra excited with 342 nm light.The product calcined in 400 ℃ had the most strongest blue emission,while the green emissions（510~530 nm） became weak and changed into blue emission.With the clacination temperature increasing,the violet-blue spectral had an obvious red shift from 404 nm to 422 nm.The emission intensity increased firstly and then decreased.

关 键 词：氧化锌 掺杂 聚乙烯醇 煅烧温度 光致发光 

分 类 号：O484.4[理学—固体物理]