Journal
JOURNAL OF LUMINESCENCE
Volume 228, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jlumin.2020.117638
Keywords
Ca2Ga2GeO7:Tb3+; Green LPL; Traps
Categories
Funding
- National Natural Science Foundation of China [11804038, 11804007]
- Natural Science Foundation of Shaanxi Province of China [2020JQ-891, 2019JQ-424]
- Opening Foundation of Key Laboratory for Special Function Materials and Structural Design of the Ministry of the Education [1zujbky-2020-kb06]
- Natural Science Foundation of the Education Committee of Shaanxi Province of China [18JK0050]
- Key Research and Development Plan of Shaanxi Province [2018ZDXMGY119]
- Key Scientific Research Plan of Shaanxi Provincial Department of Education [18JC001]
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A new type of long persistent green luminescent phosphor Ca2Ga2GeO7: Tb3+ was prepared by high temperature solid-state reaction technique. In this paper, the crystal structure, luminescence properties and decay curves of phosphors were mainly studied. The long persistent luminescence (LPL) properties of these phosphors were characterized by LPL spectra, LPL decay curves and thermoluminescence (TL) spectra. When the ultraviolet (UV) light source was turned off, Ca2Ga2GeO7: Tb3+ phosphor exhibit typical LPL behavior for approximately 1.2 h. The green-emitting LPL was originated form the typical D-5(4) -> F-7(5) transition of Tb3+ ions, and the green LPL is similar to PL. Based on the experimental results, the LPL mechanism and traps distribution of the Ca2Ga2GeO7: Tb3+ was described via TL analysis in detail.
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