Thermoluminescence, photoluminescence and EPR studies on Mn2+ activated yttrium aluminate (YAlO3) perovskite

Premkumar, HB and Sunitha, DV and Nagabhushana, H and Sharma, SC and Nagabhushana, BM and Shivakumara, C and Rao, JL and Chakradhar, RPS (2012) Thermoluminescence, photoluminescence and EPR studies on Mn2+ activated yttrium aluminate (YAlO3) perovskite. Journal of Luminescence, 132 (9). pp. 2409-2415. ISSN 0022-2313

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Thermoluminescence (TL) measurements were carried out on undoped and Mn2+ doped (0.1 mol%) yttrium aluminate (YAlO3) nanopowders using gamma irradiation in the dose range 1–5 kGy. These phosphors have been prepared at furnace temperatures as low as 400 °C by using the combustion route. Powder X-ray diffraction confirms the orthorhombic phase. SEM micrographs show that the powders are spherical in shape, porous with fused state and the size of the particles appeared to be in the range 50–150 nm. Electron Paramagnetic Resonance (EPR) studies reveal that Mn ions occupy the yttrium site and the valency of manganese remains as Mn2+. The photoluminescence spectrum shows a typical orange-to-red emission at 595 nm and suggests that Mn2+ ions are in strong crystalline environment. It is observed that TL intensity increases with gamma dose in both undoped and Mn doped samples. Four shouldered TL peaks at 126, 240, 288 and 350 °C along with relatively resolved glow peak at 180 °C were observed in undoped sample. However, the Mn doped samples show a shouldered peak at 115 °C along with two well defined peaks at ∼215 and 275 °C. It is observed that TL glow peaks were shifted in Mn doped samples. The kinetic parameters namely activation energy (E), order of kinetics (b), frequency factor (s) of undoped, and Mn doped samples were determined at different gamma doses using the 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 Science B.V
Uncontrolled Keywords: Phosphor;Chemical synthesis;X-ray diffraction;EPR; Luminescence
Subjects: AERONAUTICS > Aeronautics (General)
ENGINEERING > Structural Mechanics
Depositing User: Ms. Alphones Mary
Date Deposited: 16 Sep 2013 04:35
Last Modified: 16 Sep 2013 04:35

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