Please use this identifier to cite or link to this item:
Title: Spectroscopic characteristics of Sm<sup>3+</sup> doped alkaline earth potassium titanium phosphate glasses
Authors: Moorthy, D V R
Jayasimhadri, M
Jang, Kiwan
Kumar, J Suresh
Babu, A Mohan
Moorthy, L Rama
Issue Date: Jun-2009
Publisher: CSIR
Abstract: The paper reports on the preparation and characterization of Sm<sup>3+</sup> doped alkaline earth potassium titanium phosphate (RKTP) glasses with molar composition of 24(NaPO<sub>3</sub>)<sub>6</sub> + 30KH<sub>2</sub>PO<sub>4</sub> + 25TiO<sub>2</sub> + 20RCl<sub>2</sub> + 1Sm<sub>2</sub>O<sub>3</sub> (R=Mg, Ca & Sr). Optical absorption spectra in the UV-VIS-NIR region reveal twelve absorption bands and are assigned to different transitions arising from the <sup>6</sup>H<sub>5/2 </sub>ground state. The energy level structure of Sm<sup>3+</sup> (4f<sup>5</sup>) has been analyzed using the free-ion Hamiltonian model. The root mean square deviations between the experimental and calculated energies of Sm<sup>3+</sup> doped MgKTP, CaKTP and SrKTP glasses are 44, 35 and 56 cm<sup>-1</sup> respectively and are comparable with the earlier reports. By measuring the areas under the absorption peaks, the experimental oscillator strengths are calculated and the phenomenological JO-intensity parameters (Ω<sub>2</sub>, Ω<sub>4</sub> and Ω<sub>6</sub>) have been determined with the help of least-squares fitting approach. These parameters exhibit a similar trend as Ω<sub>2</sub>>Ω<sub>6</sub>>Ω<sub>4</sub> in all the three glasses. The evaluated JO parameters are then used to calculate the excited <sup>4</sup>G<sub>5/2</sub> level radiative properties such as radiative transition probabilities (<i style="">A</i><sub>R</sub>), branching ratios (β<sub>R</sub>) and lifetimes (<img src='/image/spc_char/tow.gif'> <sub>R</sub>). The emission spectra recorded by exciting with 476 nm shows four peaks at 563, 599, 649 and 714 nm and are assigned to <sup>4</sup>G<sub>5/2</sub><sup> </sup>→ <sup>6</sup>H<sub>5/2</sub>, <sup>6</sup>H<sub>7/2</sub>, <sup>6</sup>H<sub>9/2</sub>,<sub> </sub><sup>6</sup>H<sub>11/2</sub> respectively. The experimentally observed decay profiles of the <sup>4</sup>F<sub>5/2 </sub>level of Sm<sup>3+</sup> are found to be single exponential yielding the lifetimes (<img src='/image/spc_char/tow.gif'> <sub>mes</sub>) 2330, 1750 and 2320 μs in MgKTP, CaKTP and SrKTP glasses respectively, which are comparable with the calculated lifetimes (<img src='/image/spc_char/tow.gif'> <sub>R</sub>) obtained from the Judd-Ofelt theory.
Description: 193-196
ISSN: 0975-1017 (Online); 0971-4588 (Print)
Appears in Collections:IJEMS Vol.16(3) [June 2009]

Files in This Item:
File Description SizeFormat 
IJEMS 16(3) 193-196.pdf97.49 kBAdobe PDFView/Open

Items in NOPR are protected by copyright, with all rights reserved, unless otherwise indicated.