Size dependence of up-conversion luminescence of NaYF<sub>4</sub>:Yb<sup>3+</sup>/Tm<sup>3+</sup> |
| |
| Authors: | LIU Xiaoge DAI Rucheng WANG Zhongping ZHANG Zengming |
| |
| Affiliation: | 1.Department of Physics;2.The Centre of Physical Experiments,University of Science and Technology of China,Hefei 230026,China) |
| |
| 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. |
| |
| Keywords: | NaYF4:Yb3+/Tm3+ upconversion luminescence surface area rare earths |
| 本文献已被 维普 等数据库收录！ |
