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Ion size effects on thermoluminescence of terbium and europium doped magnesium orthosilicate

Published online by Cambridge University Press:  30 October 2015

Ying Zhao ,
Yang Zhou ,
Yun Jiang ,
Weigong Zhou ,
Adrian A. Finch ,
Peter D. Townsend  and
Yafang Wang
Ying Zhao
Affiliation:
School of Science, China University of Geosciences, Beijing 100083, China
Yang Zhou
Affiliation:
School of Science, China University of Geosciences, Beijing 100083, China
Yun Jiang
Affiliation:
School of Science, China University of Geosciences, Beijing 100083, China
Weigong Zhou
Affiliation:
School of Great Wall, China University of Geosciences, Beijing 100083, China
Adrian A. Finch
Affiliation:
Department of Earth & Environmental Sciences, University of St Andrews, Fife KY16 9AL, United Kingdom
Peter D. Townsend
Affiliation:
Physics Building, University of Sussex, Brighton BN1 9QH, United Kingdom
Yafang Wang*
Affiliation:
School of Science, China University of Geosciences, Beijing 100083, China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Thermoluminescence (TL) and radioluminescence (RL) are reported over the temperature range 25–673 K from MgSiO4:Tb and MgSiO4:Eu. The dominant signals arise from the transitions within the Rare Earth (RE) dopants, with limited intensity from intrinsic or host defect sites. The Tb and Eu ions distort the lattice and alter the stability of the TL sites and the peak TL temperature scales with the Tb and Eu ion size. The larger Eu ions stabilize the trapped charges more than for the Tb, and so the Eu TL peak temperatures are ∼20% higher. There are further size effects linked to the TL driven by the volume of the upper state orbitals of the rare earth transitions. For Eu the temperatures of the TL peaks are wavelength dependent since higher excited states couple to distant traps via more extensive orbits. The same pattern of peak temperature data is encoded in RL during heating. The data imply that there are sites in which the rare earth and charge stabilizing defects are closely associated within the host lattice, and the stability of the entire complex is linked to the lattice distortions from inclusions of impurities.

Keywords

radiation effectsluminescenceoptical properties
Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 22 , 27 November 2015 , pp. 3443 - 3452
Copyright
Copyright © Materials Research Society 2015 

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