溶胶-凝胶制备ZnO-SiO2复合膜的量子效应和上转换发光  

Quantum effect and up-conversion luminescence of ZnO-SiO_2 composite films synthesized by sol-gel technique

作　　者：袁宁一[1,2] 李锋[1] 何泽军[1] 丁建宁[1] 陈效双[2] 陆卫[2] 

机构地区：[1]江苏工业学院低维材料微纳器件及系统研究中心,常州213164 [2]中国科学院上海技术物理研究所国家红外重点实验室,上海200831

出　　处：《物理学报》2009年第4期2649-2653,共5页Acta Physica Sinica

基　　金：江苏省自然科学基金(批准号:BK2006042)资助的课题~~

摘　　要：采用溶胶-凝胶技术在玻璃衬底上制备了ZnO薄膜和ZnO-SiO2复合膜.原子力显微镜照片显示ZnO薄膜具有球状纳米晶粒;可见光-紫外透射光谱表明ZnO-SiO2复合膜在可见光区的透过率大约是85%,透过率从330nm开始下降,到290nm附近降为零.由于量子效应,吸收边出现明显的蓝移.在室温下用不同波长的光激发ZnO-SiO2复合膜,光致发光谱显示ZnO-SiO2复合膜对应于激子发射的290nm附近的紫外发光峰与透射谱所显示的吸收边位置一致,没有出现斯托克斯红移.同时,ZnO-SiO2复合膜出现了双光子和三光子吸收现象和上转换发光现象.ZnO thin films and ZnO-SiO2 composite films were deposited on glass substrates by sol-gel method.Atomic force microscope images showed that ZnO nano-particles havd spherical shape of relativly small size.The ultraviolet-visible transmittance spectra showed that the transmittance of ZnO-SiO2 composite film is about 85% in visible range and the transmittance begins to drop at about 330 nm and reaches zero around 290 nm.Due to quantum effect,the absorption edge has an obvious blue shift.Photoluminescence spectra measurement indicated that ZnO-SiO2 composite film excited by a Xe lamp with different wavelength has a UV emission around 290 nm coming from combination of free excitons,which is in agreement with the ultraviolet-visible transmittance measurement result.Meanwhile,two photon and three photon absorption and up-conversion luminescence were observed in the ZnO-SiO2 composite film.

关 键 词：ZnO-SiO2 量子效应 双光子和三光子吸收 上转换发光 

分 类 号：TB383.2[一般工业技术—材料科学与工程]