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Abstract:
KLaF4 nanocrystals (NCs) co-doped with 2%Er3+(fixed) and varied Yb3+ doping mole fractions (10%, 14%, 18%) were synthesized by hydrothermal method. The samples were annealed in argon at 300°C for 1.5 h. The crystal structure and morphology of the samples were confirmed by X-ray diffraction (XRD) and transmission electron microscopy (TEM), respectively. The optical properties of the samples were evaluated by diffuse reflectance spectra and up-conversion photoluminescence spectroscopy with the average fluorescent lifetimes of 2H11/2 level under laser excitation at 980 nm. The results show hexagonal KLaF4: Er3+, Yb3+ NCs are successfully obtained, which have a longitude of about 130 nm and a diameter of 28 nm for the annealed sample. The diffuse reflection spectra indicate that the absorbtion at around 973 nm is enhanced with the increase of Yb3+ mole fraction while Er3+ mole fraction is fixed. The near-infrared light at 980 nm can be up-converted to green and red light. Furthermore, both the intensities of the red and green light and the average fluorescence lifetimes for 2H11/2 level were decreased with the increase of Yb3+ ion concentration in KLaF4: Er3+, Yb3+ NCs. In addition, the effect of Yb3+ doping concertration on the intensity of up-conversion luminescence and the average fluorescence lifetimes for 2H11/2 level were briefly clarified.
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Chinese Journal of Luminescence
ISSN: 1000-7032
CN: 22-1116/O4
Year: 2013
Issue: 10
Volume: 34
Page: 1259-1263
Cited Count:
SCOPUS Cited Count: 2
ESI Highly Cited Papers on the List: 0 Unfold All
WanFang Cited Count:
Chinese Cited Count:
30 Days PV: 2
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