Open Access
Table 2
Er3+ Electronic transitions observed in emission, 
is the fraction of power emitted in a specific spectral domain of the transition “i”, 
, the absolute efficiency of the emission “i”.
| Z18 | CYF | ||||
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| i | Electronic transition |
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| 1 | 4I13/2 → 4I15/2 | 61.5% | 20.3% | 49.9% | 16.8% |
| 2 | 4I11/2 → 4I15/2 | 34.8% | 11.5% | 47.6% | 16.0% |
| 3 | 4S3/2 → 4I13/2 | 0.7% | 0.2% | 0.2% | 0% |
| 4 | 4F9/2 → 4I15/2 | 1.2% | 0.4% | 1.6% | 0.5% |
| 5 | 4S3/2 → 4I |
1.7% | 0.6% | 0.7% | 0.2% |
| 6 | 2G9/2 → 4I |
0.1% | 0% | 0% | 0% |
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