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초록·키워드
Luminescence properties of CaF<sub>2</sub>:Tb<sup>3+</sup> nanoparticles were studied in order to investigate the effect of CaF<sub>2</sub> native defects on the photoluminescence dynamics of Tb<sup>3+</sup> ions. Incorporation of Tb ions into the CaF<sub>2</sub> host was confirmed by X-ray diffraction and X-ray photoelectron spectroscopy. Cross-relaxation energy transfer was observed from the photoluminescence spectra and decay curves upon excitation at 257 nm. However, the unusual long lifetime of the Tb<sup>3+</sup> ion as well as the decreasing trend of emission lifetime of the <sup>5</sup>D<sub>3</sub> level suggested the involvement of traps, which were further investigated by using temperature-dependent photoluminescence measurements, thermoluminescence and lifetime measurements at different wavelengths. This work highlights the critical role that the CaF<sub>2</sub> native defects play in the photoluminescence dynamics of Tb<sup>3+</sup> ions incorporated in a CaF<sub>2</sub> matrix. The sample doped with 10 mol% of Tb<sup>3+</sup> ions was found to be stable under prolonged 254 nm ultraviolet irradiation.
#Photoluminescence
#Luminescence
#Thermoluminescence
#Ion
#Materials science
#Photoluminescence excitation
#X-ray photoelectron spectroscopy
#Doping
#Analytical Chemistry (journal)
#Nanoparticle
#Spectroscopy
#Ultraviolet
#Photochemistry
#Optoelectronics
#Chemistry
#Nanotechnology
#Nuclear magnetic resonance
#Physics
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