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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Joseph, Cyriac Thomas, Sunil Biju, P. R. Unnikrishnan, N. V. Gopi, Subhash Vidyadharan, Viji Remya, Mohan P. |
| Description | Country affiliation: India Author Affiliation: Vidyadharan V ( School of Pure & Applied Physics, Mahatma Gandhi University, Kottayam 686560, India.); Remya MP ( School of Pure & Applied Physics, Mahatma Gandhi University, Kottayam 686560, India.); Gopi S ( School of Pure & Applied Physics, Mahatma Gandhi University, Kottayam 686560, India.); Thomas S ( School of Pure & Applied Physics, Mahatma Gandhi University, Kottayam 686560, India.); Joseph C ( School of Pure & Applied Physics, Mahatma Gandhi University, Kottayam 686560, India.); Unnikrishnan NV ( School of Pure & Applied Physics, Mahatma Gandhi University, Kottayam 686560, India.); Biju PR ( School of Pure & Applied Physics, Mahatma Gandhi University, Kottayam 686560, India. Electronic address: prb.mgu@gmail.com.) |
| Abstract | The spectroscopic properties of trivalent samarium doped Sr0.5Ca0.5TiO3 perovskite phosphor material (Sr0.5Ca0.5TiO3:xSm(3+), x=0.05, 0.1, 0.5, 1, 1.5) synthesized by the solid state method have been studied. The X-Ray Diffraction profile confirms the orthorhombic perovskite Sr0.5Ca0.5TiO3 structure of the prepared samples. The SEM study reveals the surface morphology. The Judd-Ofelt intensity parameters were calculated for 0.5 wt% Sm(3+) doped Sr0.5Ca0.5TiO3. Transition probabilities, branching ratios and radiative lifetime were evaluated by using Judd-Ofelt analysis. The emission spectra under 405 nm excitation shows five emission peaks at 564 nm, 599 nm, 645 nm, 707 nm and 776 nm corresponding to the transitions (4)G5/2â (6)Hj (j=5/2, 7/2, 9/2, 11/2 and 13/2) respectively. The higher values of branching ratio and stimulated emission cross-section for (4)G5/2â (6)H7/2 transition of Sr0.5Ca0.5TiO3:0.5 wt% Sm(3+) shows its suitability in the field of visible lasers and optical fiber amplifiers. The experimental lifetimes of Sm(3+) doped samples were estimated using the decay curves corresponding to (4)G5/2â (6)H7/2 transition upon 405 nm excitation. Concentration dependence on emission intensity and experimental lifetime were also studied. From the CIE diagram we can see that as the concentration of Sm(3+) ions increases from 0.05 wt% to 1.5 wt% the CIE color co-ordinates changes from greenish yellow to yellowish orange. |
| ISSN | 13861425 |
| Journal | Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy |
| Volume Number | 150 |
| e-ISSN | 18733557 |
| Language | English |
| Publisher | Elsevier |
| Publisher Date | 2015-11-05 |
| Publisher Place | Great Britain (UK) |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Discipline Spectroscopy |
| Content Type | Text |
| Resource Type | Article |
| Subject | Spectroscopy Atomic and Molecular Physics, and Optics Analytical Chemistry Instrumentation |
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