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Ce3+ and Eu2+ doped alkaline earth aluminates MAl2O4 (M = Ca, Sr, Ba) were prepared by single-step combustion synthesis at low temperature (600 ℃). X-ray diffraction (XRD) analysis confirmed the formation of BaAl2O4, CaAl2O4, and SrAl2O4. Photoluminescence spectra and optimal luminescent properties of Ce3+ and Eu2+ doped MAl2O4 phosphors were studied. Relation between Eu2+ and Ce3+ f-d transitions was explained. Spectroscopic properties known for Ce3+ were used to predict those of Eu2+ by using Dorenbos’ method. The values thus calculated were in excellent agreement with the experimental results. The preferential substitution of Ce3+ and Eu2+ at different Ba2+, Sr2+, Ca2+ crystallographic sites was discussed. The dependence of emission wavelengths of Ce3+ and Eu2+ on local symmetry of different crystallographic sites was also studied by using Van Uitert’s empirical relation. Experimental results matched excellently with the predictions of Dorenbos’ and Van Uitert’s models.


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d-f luminescence of Ce3+ and Eu2+ ions in BaAl2O4, SrAl2O4 and CaAl2O4 phosphors

Show Author's information K. A. GEDEKARa( )S. P. WANKHEDEaS. V. MOHARILbR. M. BELEKARc
Department of Physics, K.D.K. College of Engineering, Nagpur 440009, India
Department of Physics, Nagpur University, Nagpur 440010, India
Department of Physics and Electronics, Government Vidarbha Institute of Science and Humanities, Amravati 444604, India

Abstract

Ce3+ and Eu2+ doped alkaline earth aluminates MAl2O4 (M = Ca, Sr, Ba) were prepared by single-step combustion synthesis at low temperature (600 ℃). X-ray diffraction (XRD) analysis confirmed the formation of BaAl2O4, CaAl2O4, and SrAl2O4. Photoluminescence spectra and optimal luminescent properties of Ce3+ and Eu2+ doped MAl2O4 phosphors were studied. Relation between Eu2+ and Ce3+ f-d transitions was explained. Spectroscopic properties known for Ce3+ were used to predict those of Eu2+ by using Dorenbos’ method. The values thus calculated were in excellent agreement with the experimental results. The preferential substitution of Ce3+ and Eu2+ at different Ba2+, Sr2+, Ca2+ crystallographic sites was discussed. The dependence of emission wavelengths of Ce3+ and Eu2+ on local symmetry of different crystallographic sites was also studied by using Van Uitert’s empirical relation. Experimental results matched excellently with the predictions of Dorenbos’ and Van Uitert’s models.

Keywords:

Ce3+, Eu2+, photoluminescence, X-ray diffraction (XRD), crystal structure
Received: 30 June 2017 Revised: 06 September 2017 Accepted: 08 September 2017 Published: 04 November 2017 Issue date: December 2017
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Publication history

Received: 30 June 2017
Revised: 06 September 2017
Accepted: 08 September 2017
Published: 04 November 2017
Issue date: December 2017

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© The author(s) 2017

Acknowledgements

We are thankful to the management of K.D.K College of Engineering, Nagpur, India, for providing necessary assistance.

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