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Upconversion luminescence of β-NaYF4: Yb3+, Er3+@β-NaYF4 core/shell nanoparticles: Excitation power density and surface dependence
| Content Provider | Semantic Scholar |
|---|---|
| Author | Wang, Yu Zhao, Junwei Sun, Yajuan Kong, Xianggui Zhang |
| Copyright Year | 2009 |
| Abstract | Coating a homogeneous layer outside the core nanoparticles has become a common method to improve the optical properties of nanoparticles. For rare earth ion-doped nanoparticles, although the homogeneous coating is found to enhance the upconversion luminescence, a large deviation in the reported enhancement amplitude, however, demonstrates the lack of a complete picture of the enhancement mechanism. In this work, we have performed steady-state and time-resolved spectroscopic studies on one of the most efficient upconversion nanosystems − β-NaYF4:Yb3+,Er3+ and β-NaYF4:Yb3+,Er3+@β-NaYF4 core/shell nanoparticles. Roles of the surface quenching centers, typically the high-frequency vibrational modes provided by the organic surfactants in the upconversion luminescence, are studied in detail. Our results show that excitation power density, once over a threshold, say ∼150 W/cm2 in this case, does have a non-negligible annealing effect, which may even lead to high luminescence upconversion intensity of the core na... |
| File Format | PDF HTM / HTML |
| DOI | 10.1021/jp9003399 |
| Alternate Webpage(s) | http://ir.ciomp.ac.cn/bitstream/181722/24485/1/Wang-2009-Upconversion%20lumines.pdf |
| Alternate Webpage(s) | https://doi.org/10.1021/jp9003399 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
