Journal
MATERIALS LETTERS
Volume 178, Issue -, Pages 185-189Publisher
ELSEVIER
DOI: 10.1016/j.matlet.2016.03.108
Keywords
Optical materials and properties; Sintering; Scanning tunneling microscopy; X-ray techniques
Funding
- National Natural Science Fund of China [51462003, 61404033]
- Science Research Fund of Guizhou Province, China [2013-7012]
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The long persistent luminescence near-infrared (NIR) phosphors Zn3Ga2Ge2O10:x % Cr3+ (x=0.1, 0.5, 2.5) were synthesized by solid-state reaction method. The microstructure and luminescence properties of the obtained samples were studied systemically. The results demonstrate that the luminescent intensity and afterglow time of the sample can be regulated by changing Cr3+ doping concentration and the calcine process. The afterglow mechanism of the samples were investigated and we found a method to balance the emission intensity and afterglow decay time. Specifically, Zn3Ga2Ge2O10:2.5% Cr3+ samples show highest initial phosphorescence intensity but decay faster than other samples. Meanwhile, the host material obtained at 1300 degrees C (with pre-sintering) can luminesce more than 40 h after stoppage of the 365 nm ultraviolet light irradiation. This new developed NIR long-persistent phosphor may have significant potential to be applied in many fields such as in vivo bio-imaging technology. (C) 2016 Published by Elsevier B.V.
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