| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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Energy Transfer and Avalanche Upconversion of NdxY1-xVO4 Nanocrystals |
| XIAO Si1, ZHOU Li1, WANG Qu-Quan1,2, DENG Hong3, YANG Shi-He3 |
| 1Department of Physics, Wuhan University, Wuhan 4300722Center of Nanoscience and Nanotechnology Research, Wuhan University, Wuhan 4300723Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong |
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| Cite this article: |
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XIAO Si, ZHOU Li, WANG Qu-Quan et al 2009 Chin. Phys. Lett. 26 124209 |
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Abstract We explore Nd3+ concentration and excitation power dependences of the avalanche upconversion of NdxY1-xVO4 (x=0-1) nanocrystals with uniform size and shape. The avalanche threshold power caused by the near-resonant energy transfer between 4F5/2→4I13/2 and 4F5/2→2G9/2 significantly decreases as the Nd3+ concentration increases. The off-resonant energy transfer between 4F5/2→4I13/2 and 4F5/2→4G11/2 in the strong excitation regime leads to apparent broadening on the blue-side of the upconversion spectrum of NdVO4 nanocrystals.
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| Keywords:
42.70.Hj
62.23.-c
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Received: 22 July 2009
Published: 27 November 2009
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| PACS: |
42.70.Hj
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(Laser materials)
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62.23.-c
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(Structural classes of nanoscale systems)
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