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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Nagabhushana, H. Dhananjaya, N. Nagabhushana, B. M. Shivakumara, C. Daruka Prasad, B. Prashantha, S. C. Sharma, S. C. Shivaram, M. Chakradhar, R. P. S. Hari Krishna, R. |
| Description | Country affiliation: India Author Affiliation: Shivaram M ( Jawaharlal Nehru Technological University, Anantapur 515002, A.P., India); Nagabhushana H ( Prof. CNR Rao, Centre for Advanced Materials, Tumkur University, Tumkur 572 103, India. Electronic address: bhushanvlc@gmail.com.); Sharma SC ( Chhattisgarh Swami Vivekanand Technical University, Bhilai (CG)-493441, India.); Prashantha SC ( Research Center, Department of Physics, East West Institute of Technology, Bangalore 560 091, India. Electronic address: scphysics@gmail.com.); Daruka Prasad B ( Chhattisgarh Swami Vivekanand Technical University, Bhilai (CG)-493441, India); Dhananjaya N ( Chhattisgarh Swami Vivekanand Technical University, Bhilai (CG)-493441, India); Hari Krishna R ( Department of Chemistry, M.S. Ramaiah Institute of Technology, Bangalore 560 054, India.); Nagabhushana BM ( Department of Chemistry, M.S. Ramaiah Institute of Technology, Bangalore 560 054, India.); Shivakumara C ( Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560 012, India.); Chakradhar RP ( CSIR-National Aerospace Laboratories, Bangalore 560 017, India.) |
| Abstract | CaTiO3:Sm(3+) (1-11 mol%) nanophosphors were successfully synthesized by a low temperature solution combustion method [LCS]. The structural and morphological properties of the phosphors were studied by using Powder X-ray diffractometer (PXRD), Fourier transform infrared (FTIR), X-ray photo electron spectroscopy (XPS), scanning electron microscope (SEM) and transmission electron microscopy (TEM). TEM studies indicate that the size of the phosphor is â ¼20-35 nm. Photoluminescence (PL) properties of Sm(3+) (1-11 mol%) doped CaTiO3 for NUV excitation (407 nm) was studied in order to investigate the possibility of its use in White light emitting diode (WLED) applications. The emission spectra consists of intra 4f transitions of Sm(3+), such as (4)G5/2â (6)H5/2 (561 nm), (4)G5/2â (6)H7/2 (601-611 nm), (4)G5/2â (6)H9/2 (648 nm) and (4)G5/2â (6)H11/2 (703 nm) respectively. Further, the emission at 601-611 nm show strong orange-red emission and can be applied to the orange-red emission of phosphor for the application for near ultra violet (NUV) excitation. Thermoluminescence (TL) of the samples irradiated with gamma source in the dose range 100-500 Gy was recorded at a heating rate of 5°Cs(-1). Two well resolved glow peaks at 164°C and 214°C along with shouldered peak at 186°C were recorded. TL intensity increases up to 300 Gy and thereafter, it decreases with further increase of dose. The kinetic parameters namely activation energy (E), frequency factor (s) and order of kinetics were estimated and results were discussed in detail. |
| ISSN | 13861425 |
| Volume Number | 128 |
| e-ISSN | 18733557 |
| Journal | Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy |
| Language | English |
| Publisher | Elsevier |
| Publisher Date | 2014-07-15 |
| Publisher Place | Great Britain (UK) |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Calcium Compounds Chemistry Luminescence Metals, Heavy Nanoparticles Oxides Samarium Titanium Journal Article Discipline Spectroscopy |
| Content Type | Text |
| Resource Type | Article |
| Subject | Spectroscopy Atomic and Molecular Physics, and Optics Analytical Chemistry Instrumentation |
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