Table 1.
Raman peaks position, width (FWHM) and their symmetry assignment of Y2O3: Pr3+ NCs synthesized by the different methods. ω and FWHM in cm−1. In bold the most intense Raman peak.
| Symmetry | Combustion | Molten Salt | Pechini | Precipitation | Solvothermal | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| ω | FWHM | ω | FWHM | ω | FWHM | ω | FWHM | ω | FWHM | |
| Tg | 128.3 | 3.4 | 130 | 18.7 | 128.4 | 2.9 | 128.3 | 3.4 | 128.6 | 2.8 |
| Ag | 160.4 | 3.9 | 160.4 | 4.2 | 160.4 | 4.2 | 160 | 4.3 | 160.7 | 3.3 |
| Eg | 192.6 | 4.4 | 193.5 | 2.3 | -- | -- | -- | -- | 192.4 | 4.6 |
| Tg | 234.1 | 1.7 | -- | -- | -- | -- | -- | -- | 234 | 3.1 |
| Tg | -- | -- | 288.4 | 29.8 | 287.7 | 19 | 285.3 | 16.5 | -- | -- |
| Tg | 316.2 | 5.9 | 315.5 | 2.8 | 316.2 | 5.1 | 315.8 | 4.4 | 316.5 | 3.8 |
| Tg +Eg | 326.0 | 8.2 | 329 | 6 | 328.7 | 8.8 | 328.4 | 10.3 | 329.4 | 6.3 |
| Tg | 376.4 | 6.8 | 376.3 | 6.1 | 376.4 | 5.9 | 376 | 6.5 | 376.5 | 5.3 |
| Ag | 430 | 9.7 | 429.6 | 5.8 | 429.9 | 7.9 | 429.8 | 7.6 | 431.4 | 9.1 |
| Tg | 468 | 9.71 | 468 | 9 | 467.54 | 11.2 | 467.3 | 10.6 | 468.2 | 9 |
| Tg | 591 | 17.9 | 592.1 | 13.7 | 590.97 | 20 | -- | -- | 591.6 | 12.3 |