Issue 47, 2020, Issue in Progress

Study of a color-tunable long afterglow phosphor Gd1.5Y1.5Ga3Al2O12:Tb3+: luminescence properties and mechanism

Abstract

Long afterglow phosphors play a significant role in practical applications. However, due to their complex electronic structures, it is difficult to obtain tunable long afterglow phosphors. Herein, a novel long afterglow phosphor, Gd1.5Y1.5Ga3Al2O12:Tb3+, was successfully synthesized. Its detailed structural information was extracted via the Rietveld method, and its corresponding optical properties were further systematically explored via photoluminescence (PL), phosphorescence and thermoluminescence (TL) spectroscopy. Both the photoluminescence and long afterglow properties showed tunable behavior with a variation in the concentration of Tb3+. The investigation of the tunability of its photoluminescence and long afterglow properties revealed that the cross-relaxation energy transfer mechanism contributes to its tunable character. Meanwhile, long-lasting phosphorescence could be observed for a few hours by the naked eye in a dark environment after discontinuing the UV irradiation. Due to the potential existence of the photo-excited (Tb3+)+, the Image ID:d0ra02942d-t1.gif defect clusters were proposed, with oxygen vacancies acting as electron trapping centers and (Tb3+)+ attracting holes. Finally, an appropriate mechanism for the tunable long afterglow emission was proposed.

Graphical abstract: Study of a color-tunable long afterglow phosphor Gd1.5Y1.5Ga3Al2O12:Tb3+: luminescence properties and mechanism

Supplementary files

Article information

Article type
Paper
Submitted
31 Mar 2020
Accepted
30 Jun 2020
First published
27 Jul 2020
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2020,10, 28049-28058

Study of a color-tunable long afterglow phosphor Gd1.5Y1.5Ga3Al2O12:Tb3+: luminescence properties and mechanism

T. Ma, H. Li, S. Zhang, W. Sun, Z. Cheng, R. Pang, J. Feng, L. Jiang, D. Li and C. Li, RSC Adv., 2020, 10, 28049 DOI: 10.1039/D0RA02942D

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