Size dependence of up-conversion luminescence of NaYF4:Yb3+/Tm3+ |
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Authors: | LIU Xiaoge DAI Rucheng WANG Zhongping ZHANG Zengming |
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Affiliation: | 1.Department of Physics;2.The Centre of Physical Experiments,University of Science and Technology of China,Hefei 230026,China) |
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Abstract: | Tm3+/Yb3+ codoped NaYF4 microcrystals were synthesized using a hydrothermal method.The bright upconversion light was observed under 980 nm excitation.The upconversion luminescence was systematically investigated at different Yb3+ concentrations and different reaction temperatures and time.The sample with 60% Yb3+ concentration and reacting at 180 oC for 24 h possessed the highest luminescent efficiency.The higher luminescent efficiency was contributed to a large surface area.The large surface area induced the large vibration mode by absorbed H2O and CO2.The larger vibration mode could enhance the energy transfer efficiency from the excited Yb3+ to Tm3+ by the process of phonon assisted energy transfer. |
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Keywords: | NaYF4:Yb3+/Tm3+ upconversion luminescence surface area rare earths |
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