Article,
Influence of gamma radiation on enhancement of luminescent properties of GdPO4:Yb3+@SiO2 nanophosphors
Radiation Physics and Chemistry, (September 2018)
DOI: 10.1016/j.radphyschem.2018.04.026
Abstract
The core/shell luminescent GdPO4:Yb3+@SiO2 nanophosphors have been synthesized via a facile solution combustion method. The effect of Yb3+ concentration and γ-radiation on the crystal phase, morphology and luminescent properties of nanophosphors has been studied. Upon photo excitation at 487 nm, GdPO4:Yb3+@SiO2 emits strong red luminescence at 640 nm and NIR luminescence at 731 nm corresponding to the 5F5 → 5I8 and 5F4 → 5I7 transitions, respectively. A 10-fold increase in luminescence intensity has been observed after increasing the Yb3+ content from 1% to 5%. Further, the Vis/NIR luminescence intensity of these nanophosphors had enhanced progressively 3–7 folds and 10–13 folds after exposed to 150 and 300 kGy γ-radiation, respectively. The dual advantage of Vis-NIR luminescence aided with biocompatibility makes these nanophosphors promising materials for biomedical applications.
