Premkumar, HB and Sunitha, DV and Nagabhushana, H and Sharma, SC and Nagabhushana, BM and Rao, JL and Gupta, K and Chakradhar, RPS (2012) YAlO3:Cr3+ nanophosphor: Synthesis, photoluminescence, EPR, dosimetric studies. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 96. pp. 154-162.
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YAlO3:Cr3+ (0.1 mol%) nanophosphor has been synthesized by low temperature solution combustion method. The X-ray diffraction studies reveal an orthorhombic structure. Transmission electron microscopy reveals that the particles are spherical in shape with nano-size ∼40–65 nm. Electron paramagnetic resonance (EPR) spectrum shows a resonance signal with effective g value at g = 1.978 which can be attributed to the exchange coupled Cr3+ ion pairs in weakly distorted sites. The photoluminescence spectrum shows an intense doublet at 677 nm and 694 nm (R lines) assigned to spin-forbidden 2Eg → 4A2g transition of Cr3+ ions. EPR and PL studies reveal that the Cr3+ ions occupy Al3+ sites in YAlO3. The interesting feature reported in this work concerns the linearity with gamma dose in the wide range (0.1–6 kGy). Prominent TL glow peaks at 226 °C and 346 °C were observed for both γ and UV-rays respectively. It is observed that the peaks at 226 °C and 346 °C eventually show a linear response up to 5 kGy which makes them a candidate for high dose dosimetry of ionizing radiation. The kinetic parameters namely activation energy (E), order of kinetics (b), frequency factor (s) of undoped and Cr doped samples were determined using Chens glow peak shape method and the results are discussed in detail.
| Item Type: | Article |
|---|---|
| Additional Information: | Copyright to this article belongs to M/s. Elsevier BV |
| Uncontrolled Keywords: | YAlO3:Cr3+ nanophosphor;Photoluminescence spectrum;Electron paramagnetic resonance (EPR) |
| Subjects: | CHEMISTRY AND MATERIALS > Chemistry and Materials (General) PHYSICS > Physics(General) |
| Depositing User: | Ms. Alphones Mary |
| Date Deposited: | 01 Apr 2013 06:30 |
| Last Modified: | 01 Apr 2013 06:30 |
| URI: | http://nal-ir.nal.res.in/id/eprint/11546 |
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