Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5441015 | Journal of Non-Crystalline Solids | 2017 | 8 Pages |
Abstract
The Ho3 +-doped gadolinium calcium silicoborate glasses with the composition of 25Gd2O3 + 10CaO + 10SiO2 + (55 â x)B2O3 + xHo2O3, where x = 0.0, 0.5, 1.0, 1.5, 2.0 and 2.5 mol%, were synthesized by well-known melt quenching method. These glasses have been characterized through physical, structural, optical, visible emission and decay curve analysis. From the absorption spectrum, Judd-Ofelt intensity parameters for 1.0 mol% Ho2O3 doped glass have been carried out and were used to examine radiative properties for the important visible emitting levels of Ho3 + ions. The present Ho3 +:glasses show strong green emission at 545 nm and red emission at 655 nm under excitation at 452 nm. The radiative decay time and stimulated emission cross-section for the (5S2,5F4) â 5I8 transition are found to be 280 μs and 0.63 Ã 10â 20 cm2, respectively. Decay curves for all the concentration of Ho3 + ions exhibit non-exponential nature for (5S2,5F4) â 5I8 transition. The decrease in decay times is due to the resonant energy transfer among the excited Ho3 + ions. Hence, these results confirm that the present silicoborate glass system could be considered as a promising candidate for visible green laser applications.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
C.R. Kesavulu, H.J. Kim, S.W. Lee, J. Kaewkhao, N. Wantana, S. Kothan, S. Kaewjaeng,