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RISS 인기검색어
- 검색키워드
- 저자 : Chubaci, J. F. (검색결과 2 건)
- 무료
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Luminescence and defect centres in MgSrAl<sub>10</sub>O<sub>17</sub>:Sm<sup>3+</sup> phosphor
Singh, Vijay,Watanabe, S.,Gundu Rao, T.K.,Chubaci, J.F.D,Kwak, Ho-Young Elsevier 2010 Journal of non-crystalline solids Vol.356 No.23
<P><B>Abstract</B></P><P>An efficient reddish orange emission MgSrAl<SUB>10</SUB>O<SUB>17</SUB>:Sm<SUP>3+</SUP> phosphor was prepared by the combustion method. The phosphor has been characterized by X-ray diffraction, scanning electron microscopy, thermogravimetric analysis measurements. Photoluminescence spectrum revealed that samarium ions are present in trivalent oxidation states. The phosphor exhibits two thermally stimulated luminescence (TSL) peaks at 210°C and 450°C. Electron spin resonance studies were carried out to identify the defect centres responsible for the TSL process in MgSrAl<SUB>10</SUB>O<SUB>17</SUB>:Sm<SUP>3+</SUP> phosphor. Three defect centres have been identified in irradiated phosphor and these centres are tentatively assigned to an O<SUP>−</SUP> ion and F<SUP>+</SUP> centres. O<SUP>−</SUP> ion (hole centre) correlates with the 210°C TSL peak while one of the F<SUP>+</SUP> centres (electron centre) appears to relate to the 450°C TSL peak.</P>
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Studies of Radiation-Induced Defects in Li2SiO3:Sm Phosphor Material
Singh, N.,Singh, V.,Watanabe, S.,Gundu Rao, T. K.,Chubaci, J. F.,Cano, N. F.,Pathak, M. S.,Singh, P. K.,Dhoble, S. J. Springer Science + Business Media 2017 Journal of electronic materials Vol.46 No.1
<P>Li2SiO3:Sm was synthesized by the solution combustion method. Powder x-ray diffraction technique was used to find the phase formation. Li2SiO3:Sm exhibits thermoluminescence (TL) peaks at approximately 140 degrees C, 155 degrees C, 190 degrees C, 250 degrees C, and 405 degrees C. Three defect centers contribute to the observed electron spin resonance spectrum from the gamma irradiated phosphor. Center I with principal g-values g(parallel to) = 2.0206 and g(perpendicular to) = 2.0028 is identified as an O-2(-) ion while center II, with an isotropic g-factor 2.0039, is assigned to an F+-type center. Center III is assigned to a Ti3+ center. The Ti3+ center is related to the 250 degrees C TL peak while the O-2(-) ion also correlates with the main TL peak at 250 degrees C. An additional defect center is observed during thermal annealing experiments, and the center (assigned to F+ center) seems to originate from an F center. The F center appears to be associated with the high temperature TL peak in a Li2SiO3: Sm phosphor. The luminescence spectrum reveals the dominant emission peaks at 605 ((4)G(5/2) -> H-6(7/2)) nm under the excitation wavelength of 402 nm.</P>
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