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Title: Dual mode green fluorescence from Tb{sup 3+}:Ca{sub 12}Al{sub 14}O{sub 33} and its applicability as delayed fluorescence

Abstract

Highlights: ► Synthesis of Yb{sup 3+}/Tb{sup 3+} co-doped Ca{sub 12}Al{sub 14}O{sub 33} phosphor. ► Dual mode emission in green area on excitation with 976 nm and 266 nm. ► Delayed fluorescence on excitation of 266 nm. ► Effect of time on delayed fluorescence. -- Abstract: A Tb{sup 3+}/Yb{sup 3+} doped calcium aluminate phosphor has been synthesized using well known combustion synthesis. The structural characterization and morphology has been studied using X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques. The characteristic luminescence of Tb{sup 3+} in both upconversion and down-conversion modes, i.e. dual mode luminescence has been recorded on excitation with 976 nm and 266 nm radiation. The Stokes emission observed on 266 nm excitation also shows a characteristic of delayed fluorescence. The delayed fluorescence has been measured as a function of time and pump power. It has been correlated to the white light emission (broad continuum emission) from the host. The possible reason of association of electron hole trapping to the defect level as well as in crystal potential is suggested.

Authors:
;  [1];  [2];  [1]
  1. Laser and Spectroscopy Laboratory, Department of Physics, Banaras Hindu University, Varanasi 221005 (India)
  2. PPN College Kanpur, UP (India)
Publication Date:
OSTI Identifier:
22215614
Resource Type:
Journal Article
Journal Name:
Materials Research Bulletin
Additional Journal Information:
Journal Volume: 47; Journal Issue: 11; Other Information: Copyright (c) 2012 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0025-5408
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CRYSTALS; DOPED MATERIALS; EXCITATION; FLUORESCENCE; OPTICAL PROPERTIES; SCANNING ELECTRON MICROSCOPY; TERBIUM IONS; TIME DEPENDENCE; X-RAY DIFFRACTION; YTTERBIUM IONS

Citation Formats

Verma, R.K., Kaur, G., Rai, A., and Rai, S.B., E-mail: sbrai49@yahoo.co.in. Dual mode green fluorescence from Tb{sup 3+}:Ca{sub 12}Al{sub 14}O{sub 33} and its applicability as delayed fluorescence. United States: N. p., 2012. Web. doi:10.1016/J.MATERRESBULL.2012.06.033.
Verma, R.K., Kaur, G., Rai, A., & Rai, S.B., E-mail: sbrai49@yahoo.co.in. Dual mode green fluorescence from Tb{sup 3+}:Ca{sub 12}Al{sub 14}O{sub 33} and its applicability as delayed fluorescence. United States. doi:10.1016/J.MATERRESBULL.2012.06.033.
Verma, R.K., Kaur, G., Rai, A., and Rai, S.B., E-mail: sbrai49@yahoo.co.in. Thu . "Dual mode green fluorescence from Tb{sup 3+}:Ca{sub 12}Al{sub 14}O{sub 33} and its applicability as delayed fluorescence". United States. doi:10.1016/J.MATERRESBULL.2012.06.033.
@article{osti_22215614,
title = {Dual mode green fluorescence from Tb{sup 3+}:Ca{sub 12}Al{sub 14}O{sub 33} and its applicability as delayed fluorescence},
author = {Verma, R.K. and Kaur, G. and Rai, A. and Rai, S.B., E-mail: sbrai49@yahoo.co.in},
abstractNote = {Highlights: ► Synthesis of Yb{sup 3+}/Tb{sup 3+} co-doped Ca{sub 12}Al{sub 14}O{sub 33} phosphor. ► Dual mode emission in green area on excitation with 976 nm and 266 nm. ► Delayed fluorescence on excitation of 266 nm. ► Effect of time on delayed fluorescence. -- Abstract: A Tb{sup 3+}/Yb{sup 3+} doped calcium aluminate phosphor has been synthesized using well known combustion synthesis. The structural characterization and morphology has been studied using X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques. The characteristic luminescence of Tb{sup 3+} in both upconversion and down-conversion modes, i.e. dual mode luminescence has been recorded on excitation with 976 nm and 266 nm radiation. The Stokes emission observed on 266 nm excitation also shows a characteristic of delayed fluorescence. The delayed fluorescence has been measured as a function of time and pump power. It has been correlated to the white light emission (broad continuum emission) from the host. The possible reason of association of electron hole trapping to the defect level as well as in crystal potential is suggested.},
doi = {10.1016/J.MATERRESBULL.2012.06.033},
journal = {Materials Research Bulletin},
issn = {0025-5408},
number = 11,
volume = 47,
place = {United States},
year = {2012},
month = {11}
}