Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 116, Issue 24, Pages 13458-13462Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp304075g
Keywords
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Funding
- NSFC [51125005]
- Singapore Ministry of Education [RG63/10]
- Singapore National Research Foundation [NRF-CRP6-2010-02, NRF-CRP5-2009-04]
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Intense near-infrared (NIR) emission around 1534 nm has been obtained from ZnO-SiO2:Er3+ composites upon broadband ultraviolet light excitation. Remarkably, enhancement of the NIR emission as much as 20 times was achieved by optimal codoping with Li+ ions. To elucidate the relevant mechanisms, comprehensive spectroscopic measurements have been performed on ZnO-SiO2 composites with and without Er3+ ions doping. Photoluminescence spectroscopy and fluorescence decay dynamics clearly verify the efficient energy transfer from ZnO quantum dots (QDs) to Er3+ ions. Our results have not only demonstrated an efficient approach of color down-conversion but also indicated that ZnO-SiO2:Er3+ composites could be a promising material for optical amplifier using broadband UV pumping.
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