1. School of Physics and Electronic Engineering, Harbin Normal University, Harbin 150025, China 2. Lab of Excited State Processes, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences,Changchun 130033, China 3. Department of Physics, Dalian Maritime University, Dalian 116026, China 4. University of Science and Technology of China, Hefei 230026, China
Abstract：Nano-powders Y2O3 with various particle sizes and different doping concentrations of Ln(Ln=Tb, Tm, Eu) were prepared by using a combustion technique. The bulky powders doped with concentrations corresponding to nano-powders were obtained by annealing the nano-powders at high temperature. The emission spectra, XRD spectra and TEM were used in the present study. The concentration quenching of luminescent centers and energy transfer between luminescent centers in Y2O3∶Ln nanocrystal powders were investigated. It was found that the behaviors of luminescence concentration quenching for 5D4→7F5∶Tb3+ and 5D0→7F2∶Eu3+ in nano-powders are similar to that in bulky powders. On the contrary, the quenching concentrations for 5D3→7F5∶Tb3+ and 1D2→3H4∶Tm3+ are distinctly higher than that in bulk powders. This owes to the size confinement effect: the interface of nanocrystal particles can stop a portion of the energy transfer, which happens in the bulk ones, between luminescent centers. The size confinement effect can bring different influences to the different types of energy transfer. For instance, it will restrain the energy transfer (governed by electric dipole-dipole interaction) between the ions in long distances, and will hardly affect the energy transfer (governed by exchange interaction) between the ions locating at near intervals.
孟庆裕1,2,陈宝玖3*,许武4,赵晓霞2,杨艳民2,狄卫华2,王晓君2 . Y2O3纳米晶体中Ln3+(Ln=Tb，Tm，Eu)发光浓度猝灭及能量传递的研究[J]. 光谱学与光谱分析, 2009, 29(01): 151-155.
MENG Qing-yu1,2,CHEN Bao-jiu3*,XU Wu4,ZHAO Xiao-xia2,YANG Yan-min2,DI Wei-hua2,WANG Xiao-jun2 . Study on Concentration Quenching and Energy Transfer in Ln3+ (Ln=Tb, Tm, Eu) in Y2O3 Nanocrystal Powders . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2009, 29(01): 151-155.
[1] LIU Chun-xu, ZHANG Jia-hua, L Shao-zhe, et al(刘春旭，张家骅，吕少哲，等). Acta Physica Sinica(物理学报), 2004, 53(11): 3945. [2] PENG Hong-shang, SONG Hong-wei, CHENG Bao-jiu, et al(彭洪尚，宋宏伟，陈宝玖，等). Acta Physica Sinica(物理学报), 2002, 51(12): 2875. [3] MENG Qing-yu, CHEN Bao-jiu, XU Wu, et al(孟庆裕，陈宝玖，许 武，等). Spectroscopy and Spectral Analysis(光谱学与光谱分析), 2006, 26(8): 1377. [4] Bhargava R N, Gallagher D, Hong X, et al. Phys. Rev. Lett., 1994, 72(3): 416. [5] Bhargava R N. J. Luminescence, 1996, 70: 85. [6] Jia M L, Zhang J H, Lu S Z, et al. Chem. Phys. Lett., 2004, 384: 193. [7] Song H W, Chen B J, Peng H S, et al. Appl. Phys. Lett., 2002, 81(10): 1776. [8] LI Dan, L Shao-zhe, WANG Hai-yu, et al(李 丹，吕少哲，王海宇, 等). Chinese Journal of Luminescence(发光学报), 2001, 22(3): 227. [9] OUYANG Fang-ping, TANG Bo(欧阳芳平，唐 波). Rare Metal Materials and Engineering(稀有金属材料与工程), 2003, 32(7): 522. [10] HUANG Shi-hua, LOU Li-ren(黄世华，楼立人). Chinese Journal of Luminescence(发光学报)，1990, 11(1): 1. [11] Lai H S, Chen B J, Xu W, et al. Journal of Alloys and Compounds, 2005, 395: 181. [12] CHEN Bao-jiu, WANG Hai-ning, HUANG Shi-hua(陈宝玖，王海宁，黄世华). Spectroscopy and Spectral Analysis(光谱学与光谱分析), 2001, 21(3): 287.
