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Depicts the identified UV–visible absorption peaks of the studied host P2O5–ZnO–CdO glass system co-doped with Er3+ and Tb3+.
| Er3+—doped glass | Tb3+—doped glass | ||
|---|---|---|---|
| Peak position (nm) | Energy transition 4I15/2 → |
Peak position (nm) | Energy transition 7F6 → |
| 253 | 2G7/2 | 314 | (5G2 + 5L6) |
| 365 | 4G9/2 | 326 | (5G5 + 5L9) |
| 375 | 4G11/2 | 348 | (5G5 + 5D2) |
| 405 | 2G9/2 | 371 | 5L10 |
| 449 | 4F5/2 | 395 | (5D3 + G6) |
| 488 | 4F7/2 | 483 | 5D4 |
| 519 | 2H11/2 | ||
| 543 | 4S3/2 | ||
| 650 | 4F9/2 | ||
| 796 | 4I9/2 | ||
| 975 | 4I11/2 | ||
