NDLI: Synthesis, Characterization, Luminescence and Defect Centres in CaYAl$_{3}$O$

Content Provider	Springer Nature Link
Author	Singh, Vijay Watanabe, S. Rao, T. K. Gundu Kwak, Ho Young
Copyright Year	2010
Abstract	CaYAl$_{3}$O$_{7}$:Eu$^{3+}$ phosphor was prepared at furnace temperatures as low as 550°C by a solution combustion method. The formation of crystalline CaYAl$_{3}$O$_{7}$:Eu$^{3+}$ was confirmed by powder X-Ray diffraction pattern. The prepared phosphor was characterized by SEM, FT-IR and photoluminescence techniques. Photoluminescence measurements indicated that emission spectrum is dominated by the red peak located at 618 nm due to the $^{5}$D$_{0}$–$^{7}$F$_{2}$ electric dipole transition of Eu$^{3+}$ ions. Electron Spin Resonance (ESR) studies were carried out to identify the centres responsible for the thermoluminescence (TL) peaks. Room temperature ESR spectrum of irradiated phosphor appears to be a superposition of two distinct centres. One of the centres (centre I) with principal g-value 2.0126 is identified as an O$^{-}$ ion while centre II with an isotropic g-factor 2.0060 is assigned to an F$^{+}$ centre (singly ionized oxygen vacancy). An additional defect centre is observed during thermal annealing experiments and this centre (assigned to F$^{+}$ centre) seems to originate from an F centre (oxygen vacancy with two electrons). The F$^{+}$ centre appears to correlate with the observed high temperature TL peak in CaYAl$_{3}$O$_{7}$:Eu$^{3+}$ phosphor.
Starting Page	313
Ending Page	320
Page Count	8
File Format	PDF
ISSN	10530509
Journal	Journal of Fluorescence
Volume Number	21
Issue Number	1
e-ISSN	15734994
Language	English
Publisher	Springer US
Publisher Date	2010-10-01
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Photoluminescence Doping Phosphors Europium Combustion Defect centres TL Analytical Chemistry Biochemistry Biotechnology Biophysics and Biological Physics Biomedicine general
Content Type	Text
Resource Type	Article
Subject	Sociology and Political Science Spectroscopy Law Biochemistry Clinical Biochemistry Clinical Psychology

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