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| Content Provider | Royal Society of Chemistry (RSC) |
|---|---|
| Author | Tang, Zuobin Wang, Yuhua Ma, Xinlong Wang, Deyin Qiang, Qinping Du, Shanshan |
| Copyright Year | 2016 |
| Abstract | Micro-sized Gd6O5F8 particles doped with Yb3+, Ho3+ and Li+ ions have been synthesized by a facile hydrothermal route. The dual-model up- and down-conversion luminescence was investigated under visible blue (VIS-B) light (451 nm) and near infrared (NIR) light (980 nm) excitations. The structural properties of the products are analysed by X-ray diffraction (XRD). Upon excitation to the 2F5/2 level of Yb3+ using a 980 nm laser diode, Gd6O5F8:Yb3+,Ho3+ exhibits intense up-converted green and red emission at 545 nm and 660 nm, which correspond to the 5S2 → 5I8 and 5F5 → 5I8 transitions of Ho3+, respectively. The nearly quadratic dependence of the green/red emission intensity on the excitation power indicates that a two-photon up-conversion process was involved to populate the green (5S2) and red levels (5F5) of Ho3+. In contrast, upon excitation Ho3+ to its 5F1 level by 451 nm blue light, both visible and near-infrared emissions peaking at 545 nm, 660 nm, 980 nm and 1191 nm are simultaneously observed in the emission spectra, which are assigned to the 5S2 → 5I8 (Ho3+), 5F5 → 5I8 (Ho3+), 2F5/2 → 2F7/2 (Yb3+) and 5I6 → 5I8 (Ho3+) transitions, respectively. Meanwhile, the emission intensities of the up-converted green emission and down-converted emissions were further enhanced by co-doping Li+, which can be confirmed by the fact that the emission intensities of the up-converted green emission and down-converted NIR emission were increased 50% and 90% after co-doping 7% Li+. The energy transfer processes between Ho3+ and Yb3+ ions and the mechanisms of Li+ doping for the emission enhancement have been investigated and discussed. Additionally, the time-resolved luminescence traces are measured, and the luminescence lifetimes of the Ho3+ ions are calculated. Furthermore, the temperature-dependent up-conversion and down-shifted luminescence of Gd6O5F8:Yb3+,Ho3+,Li+ are investigated, and the results show that the ratio of up-converted green to red emission as well as the ratio of down-shifted green to blue emission in Gd6O5F8:Yb3+,Ho3+,Li+ all respond single exponentially to temperature, which could be applied to sense temperature. |
| Starting Page | 7148 |
| Ending Page | 7155 |
| Page Count | 8 |
| File Format | HTM / HTML PDF |
| ISSN | 20507526 |
| Volume Number | 4 |
| Issue Number | 29 |
| Journal | Journal of Materials Chemistry C |
| DOI | 10.1039/c6tc01812b |
| Language | English |
| Publisher | Royal Society of Chemistry |
| Access Restriction | Open |
| Subject Keyword | NIR Li Hydrothermal circulation Luminescence X-ray crystallography Diode Correlation and dependence Emission intensity Dopant |
| Content Type | Text |
| Resource Type | Article |
| Subject | Chemistry Materials Chemistry |
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