Thermally stable photoluminescence and long persistent luminescence of Ca3Ga4O9:Tb3+/Zn2+

Zhangwen Long, Junhe Zhou, Jianbei Qiu*, Qi Wang, Dacheng Zhou, Xuhui Xu, Xue Yu, Hao Wu, Zhencai Li

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

31 Citations (Scopus)

Abstract

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.

Original languageEnglish
JournalJournal of Rare Earths
Volume36
Issue number7
Pages (from-to)675-679
Number of pages5
ISSN1002-0721
DOIs
Publication statusPublished - Jul 2018
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2018

Keywords

  • Long persistent luminescence
  • Rare earths
  • Self-activated
  • Successive trap distribution
  • Thermal stability

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