Judd–Ofelt parameters and radiative properties of Sm3+ ions doped zinc bismuth borate glasses
✍ Scribed by A. Agarwal; I. Pal; S. Sanghi; M.P. Aggarwal
- Publisher
- Elsevier Science
- Year
- 2009
- Tongue
- English
- Weight
- 259 KB
- Volume
- 32
- Category
- Article
- ISSN
- 0925-3467
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✦ Synopsis
Glasses having composition 20ZnOÁxBi 2 O 3 Á(79 À x)B 2 O 3 (15 6 x 6 35 mol%) and doped with 1 mol% Sm 3+ ions have been prepared by melt quench technique. Optical absorption and fluorescence spectra have been recorded. Judd-Ofelt approach has been applied for the f M f transition of Sm 3+ ions to evaluate various intensity parameters (X 2 , X 4 , X 6 ). The variations in intensity parameters, radiative transition probabilities and hypersensitive band positions with composition have been discussed. The variation of X 2 with Bi 2 O 3 content have been attributed to change in the asymmetry of the ligand field at the rare earth ion site and to the changes in their rare earth-oxygen (RE-O) covalency, whereas the variation of X 6 is found to be strongly dependent on nephlauxetic effect. The shift of the hypersensitive band shows that the covalency of the RE-O bond increases with increase of Bi 2 O 3 content due to increased interaction between the Sm 3+ ion and non-bridging oxygens. The radiative transition probabilities for the Sm 3+ ions are large in zinc bismuth borate glasses, suggesting their suitability as laser material.