物理化学学报 >> 2010, Vol. 26 >> Issue (03): 685-690.doi: 10.3866/PKU.WHXB20100234

光化学与光谱 上一篇    下一篇

Er3+和Ce3+/Ce4+掺杂β-BaB2O4纳米棒的制备、结构与发光性质

何贵平, 张弜, 姚若河   

  1. 华南理工大学理学院物理系, 广州 510641; 华南理工大学电子与信息学院, 广州 510641
  • 收稿日期:2009-10-13 修回日期:2009-12-07 发布日期:2010-03-03
  • 通讯作者: 张弜 E-mail:jonney@scut.edu.cn

Preparation, Structure and Photoluminescence of Er3+ and Ce3+/Ce4+ Doped β-BaB2O4 Nanorods

HE Gui-Ping, ZHANG Jiang, YAO Ruo-He   

  1. Department of Physics, School of Science, South China University of Technology, Guangzhou 510641, P. R. China; 2School of Electronic and Information Engineering, South China University of Technology, Guangzhou 510641, P. R. China
  • Received:2009-10-13 Revised:2009-12-07 Published:2010-03-03
  • Contact: ZHANG Jiang E-mail:jonney@scut.edu.cn

摘要:

以Ba(NO3)2、NaBH4、Er2O3和CeO2为原料, 在十六烷基三甲基溴化铵(CTAB)表面活性剂辅助下, 采用水热法制备了β-BaB2O4 (β-BBO)纳米棒, 稀土离子Er3+单掺杂的β-BBO(β-BBO:Er3+)及Er3+和Ce3+/Ce4+共掺杂的β-BBO(β-BBO:Er3+/Ce3+/Ce4+)纳米棒. 通过X射线粉末衍射(XRD)、傅里叶变换红外(FTIR)光谱、拉曼光谱、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线光电子能谱(XPS)和光致发光(PL)光谱分别对样品的物相、结构、形貌、成分及光致发光性质进行了表征. 研究结果表明: 微量稀土离子掺杂并不改变β-BBO的结构, 制得的纳米棒尺寸均匀, 长度在200-500 nm 之间, 直径在10-20 nm 之间; β-BBO:Er3+和β-BBO:Er3+/Ce3+/Ce4+纳米棒在400nm光激发下, 在可见光范围内都观察到中心波长为515和542 nm的绿光. 对发光机理的初步研究表明: 发光分别对应于Er3+的2H11/2→4I15/2, 4S3/2→4I15/2跃迁, 铈离子以Ce3+和Ce4+两种形式存在于体系中, Ce3+对Er3+起敏化作用, 可以显著增强β-BBO:Er3+/Ce3+/Ce4+纳米棒的发光强度, 存在Ce3+→Er3+的能量传递过程.

关键词: 光致发光, β-BaB2O4, 纳米棒, 稀土离子, 掺杂

Abstract:

β-BaB2O4 (β-BBO) nanorods, rare earth ion Er3+ doped (β-BBO:Er3+) and Er3+, Ce3+/Ce4+ co-doped (β-BBO:Er3+/Ce3+/Ce4+) nanorods were synthesized by the cetyltrimethylammoniumbromide (CTAB) assisted hydrothermal method using Ba(NO3)2, NaBH4, Er2O3, and CeO2 as raw materials. The as-prepared products were studied by X-ray powder diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, Raman spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectra (XPS), and photoluminescence (PL) spectroscopy. Results indicate that the structure of the β-BBO nanorods doped with Er3+, Ce3+/Ce4+ was unchanged. The obtained nanorods have uniformdiameters of 10-20 nmand lengths of 200-500 nm. Upon excitation with 400 nm light, the doped β-BBO nanorods exhibit a strong green light emission. PL spectra indicate that the emission bands at 515 and 542 nm correspond to the 2H11/2→4I15/2 and 4S3/2→4I15/2 transitions of Er3+, respectively. In the samples, the cerium dopant exists as Ce3+ and Ce4+. Ce3+ sensitizes Er3+ and enhances the luminescence intensity of the doped nanorods remarkably and energy transfer fromCe3+→Er3+ was observed.

Key words: Photoluminescence, β-BaB2O4, Nanorods, Rare earth ion, Doping

MSC2000: 

  • O649