首页 | 本学科首页   官方微博 | 高级检索  
     检索      

纳米ZnO薄膜的光致发光性质
引用本文:宋国利,孙凯霞.纳米ZnO薄膜的光致发光性质[J].光子学报,2005,34(4):590-593.
作者姓名:宋国利  孙凯霞
作者单位:哈尔滨学院物理系,黑龙江,150086
基金项目:黑龙江省教育厅科学技术研究项目( 10543072 ),哈尔滨市科学研究基金项目(2004AFXXJ005)资助
摘    要:利用溶胶-凝胶法制备了纳米ZnO薄膜,室温下测量了样品的光致发光谱(PL)、吸收谱(ABS)、X射线衍射谱(XRD).X射线衍射(XRD)的结果表明:纳米ZnO薄膜呈多晶状态,具有六角纤锌矿晶体结构和良好的C轴取向.观察到二个荧光发射带,中心波长分别位于395 nm的紫带、524 nm的绿带和450 nm附近的蓝带.证实了纳米ZnO薄膜绿光可见发射带来自氧空位(VO)形成的浅施主能级和锌空位(VZn)形成的浅受主能级之间的复合;450 nm附近的蓝带来自电子从VO的浅施主能级到价带顶或锌填隙(Zni) 到价带顶或导带底到VZn的浅受主能级的复合.

关 键 词:纳米ZnO薄膜  光致发光
收稿时间:2004/9/30
修稿时间:2004年9月30日

Photoluminescence Emission Properties of Nanocrystalline ZnO Films
Song Guoli,Sun Kaixia.Photoluminescence Emission Properties of Nanocrystalline ZnO Films[J].Acta Photonica Sinica,2005,34(4):590-593.
Authors:Song Guoli  Sun Kaixia
Institution:(Department of Physics , Harbin University, Harbin 150086)
Abstract:Nanocrystalline ZnO films is a promising material for short-wave laser and luminescence etc, due to its wide band gap (3.37 eV) and high exciton binding energy(60 meV)at room temperature.Nanocrystalline ZnO films is prepared by using sol-gel, grow on a quartz glass subtractes, Photoluminescence spectra and Absorption spectra of nanocrystalline ZnO films with excitation wavelength 365 nm are measured at room temperature.Two emission bands are observed, one being a narrow violet band its central wavelength is 395nm and the other being wide visible band its central wavelength is 524 nm, 450 nm.Crystal structure of samples are examined by X-ray diffraction (XRD) pattern, the mean grain size of nanocrystalline ZnO films are calculated by with Debye-Scherrer formula.The results indicate that nanocrystalline ZnO films has a hexagonal wurtzite structure and polycrystalline, and showed sharp diffraction peak for ZnO(002),which indicate that as-sputered film were highly c-axis oriented.In particular the mechanism behind the visible luminescence has also been discussed in this paper.It should be said that the mechanism behind the visible luminescence is still a question of debate.In this paper the visible emission processes of nanocrystalline ZnO.The experiments prove that the luminescence emission peak located 524 nm corresponds to the transition from the shallow level of oxygen vacancy to the shallow level of zinc vacancy; and the luminescence emission peak located 450 nm corresponds to the transition from the shallow level of oxygen vacancy to valence band or the interstitial or conductor band to the shallow level of zinc vacancy.
Keywords:Nanocrystalline ZnO films  Photoluminescence(PL)
本文献已被 CNKI 维普 万方数据 等数据库收录!
点击此处可从《光子学报》浏览原始摘要信息
点击此处可从《光子学报》下载免费的PDF全文
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号