The luminescence properties of Dy3+-doped alkaline earth titanium phosphate glasses

✍ Scribed by D.V.R. Murthy; B.C. Jamalaiah; A. Mohan Babu; T. Sasikala; L. Rama Moorthy

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 323 KB
• Volume: 32
• Category: Article
• ISSN: 0925-3467
• DOI: 10.1016/j.optmat.2010.03.009

✦ Synopsis

Optical absorption, luminescence and decay profiles of Dy 3+ -doped alkaline earth titanium phosphate glasses were studied. The absorption transitions in the UV-VIS-NIR regions were assigned to different transitions from the 6 H 15/2 ground state to various excited states. The measured energy levels were fitted to the free-ion Hamiltonian model by diagonalising the energy matrices of 4f 9 electronic configuration of Dy 3+ ion. Judd-Ofelt parameters were evaluated using the measured oscillator strengths by least squares fit method. The radiative transition probabilities stimulated emission cross-sections, optical gain parameters and quantum efficiencies were determined for the 4 F 9/2 ? 6 H 13/2 emission transition at 574 nm. The reasons for the emission of white luminescence as well as the measurement of 4 F 9/2 metastable state lifetimes were discussed.