Er^(3+)∶CaMoO_4单晶的坩埚下降法生长与光谱性能  

Growth and Spectral Properties of Er^(3+)∶CaMoO_4 Single Crystal by Vertical Bridgman Method

作　　者：王敏刚[1] 叶斌[2] 魏冉[1] 胡旭波[1] 戴世勋[2] 陈红兵[1] 

机构地区：[1]宁波大学材料科学与化学工程学院新型功能材料及其制备科学国家重点实验室培育基地,宁波315211 [2]宁波大学高等技术研究院,宁波315211

出　　处：《人工晶体学报》2015年第10期2626-2631,共6页Journal of Synthetic Crystals

基　　金：国家自然科学基金(21171102);973计划前期研究专项(2011CB612306);宁波大学王宽城幸福基金

摘　　要：采用高温固相反应法合成Er3+∶Ca Mo O4多晶料,通过坩埚下降法生长出1mol%Er3+掺杂Ca Mo O4单晶;应用X射线粉末衍射证实了晶体材料的结晶物相,测试了退火前后单晶试样的透射光谱、吸收光谱、上转换荧光光谱和近红外荧光光谱,应用Judd-Ofelt理论计算了Er3+∶Ca Mo O4晶体的光谱性能参数。研究表明,在980 nm激发光源作用下,从单晶试样获得较强的上转换绿色荧光发射,且呈现以1535 nm为中心波长的较宽荧光发射;经空气氛退火处理单晶试样的光学透过性得以改善,其上转换荧光发射和近红外荧光发射也得以明显增强。Er3＋doped CaMoO4 polycrystalline material was prepared by solid-state reaction method at elevated temperature. 1 mol% Er3＋-doped CaMoO4 single crystal was grown by vertical Bridgman method. The crystalline phase of as-prepared materials were verified by X-ray powder diffraction. The spectral properties of unannealed and annealed crystal samples, such as transmission spectra, absorption spectra, up-conversion fluorescence spectra and near-infrared fluorescence spectra, were measured systematically. The spectral parameters of Er 3＋ -doped CaMoO4 crystal were calculated based on the Judd- Ofeh theory. Under 980 nm photonic excitation, a strong up-conversion fluorescence emission with green colour and a wide near-infrared fluorescence emission with the central wavelength of 1535 nm were observed. By means of the annealing treament in air atomosphere, the optical transmittance of the annealed crystal sample can be improved and the up-conversion fluorescence emission and the near- infrared fluorescence emission are also enhanced obviously.

关 键 词：钼酸钙单晶 坩埚下降法 光谱性能 JUDD-OFELT理论 

分 类 号：O78[理学—晶体学]