Journal
JOURNAL OF RARE EARTHS
Volume 36, Issue 7, Pages 675-679Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jre.2017.11.016
Keywords
Self-activated; Long persistent luminescence; Successive trap distribution; Thermal stability; Rare earths
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Funding
- National Natural Science Foundation of China [11774138]
- Society Development Foundation of Yunnan Province [2016FA021]
- Kunming University of Science and Technology [KKSY201632046]
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A green long persistent luminescence (LPL) phosphor Ca3Ga4O9:Tb3+/Zn2+ was prepared. Ca3Ga4O9 matrix exhibits blue self-activated LPL due to the creation of intrinsic traps. When Tb3+ is doped, the photoluminescence (PL) and LPL colors change from blue to green with their intensities significantly enhanced. The doping of Zn2+ evidently improves the PL and LPL performances of the Ca3Ga4O9 matrix and Ca3Ga4O9:Tb3+. The thermoluminescence (TL) spectra show that a successive trap distribution is formed by multiple intrinsic traps with different depths in the Ca3Ga4O9 matrix, and the incorporation of Tb3+ and Zn2+ effectively increases the densities of these intrinsic traps. The existence of a successive trap distribution makes the Ca3Ga4O9:Tb3+/Zn2+ phosphor exhibit thermally stable PL and LPL. It is indicated that this phosphor shows great promise for the application such as high-temperature LPL phosphor. (C) 2018 Published by Elsevier B.V. on behalf of Chinese Society of Rare Earths.
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