| Autor: |
Kamma, Indumathi, Reddy, B. Rami |
| Předmět: |
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| Zdroj: |
Journal of Applied Physics; Jun2010, Vol. 107 Issue 11, p113102, 5p, 2 Charts, 11 Graphs |
| Abstrakt: |
Holmium doped lead–germano–tellurite glass was prepared by the melt quenching technique. The Judd–Ofelt intensity parameters were estimated as Ω2=7.6×10-20, Ω4=12.9×10-20, and Ω6=2.5×10-20 cm2. Radiative transition probabilities and lifetimes were also determined for some of the levels. Room temperature upconversion emissions have been observed from Ho3+ at 497 nm under 532 nm laser excitation, and at 557 and 668 nm under 762 nm laser excitation. The upconversion emission mechanisms were found to be due to a step wise excitation process. Upconversion emission intensity enhanced in a heat treated glass. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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