Highly spectral dependent enhancement of upconversion emission with sputtered gold island films |
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| Authors: | Zhang Hua Xu Di Huang Yu Duan Xiangfeng |
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| Affiliation: | Department of Materials Science and Engineering, University of California, Los Angeles, CA 90095, USA. |
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| Abstract: | We report a five-fold overall enhancement of upconversion emission in NaYF(4)?:?Yb/Er nanocrystals when coupled with gold island films. Spectroscopic studies show that the enhancement factors are highly dependent on the exact spectral positions and excitation power density, with a largest enhancement factor of more than 12 observed at selected spectral positions, which may be attributed to different upconversion processes involved. |
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