| 光谱学与光谱分析 |
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| Study on Concentration Quenching and Energy Transfer in Ln3+ (Ln=Tb, Tm, Eu) in Y2O3 Nanocrystal Powders |
| MENG Qing-yu1,2,CHEN Bao-jiu3*,XU Wu4,ZHAO Xiao-xia2,YANG Yan-min2,DI Wei-hua2,WANG Xiao-jun2 |
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 |
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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.
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Received: 2007-09-26
Accepted: 2007-12-28
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Corresponding Authors:
CHEN Bao-jiu
E-mail: qingyumeng@yahoo.com.cn
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