Citation:
WANG Xia, HU Hui, BAI Yan. Enhancement of Upconversion Luminescence in TeO2:Tm3+/Er3+/Yb3+ Nanoparticles by Li+ Doping[J]. Chinese Journal of Inorganic Chemistry,
;2013, 29(4): 659-664.
doi:
10.3969/j.issn.1001-4861.2013.00.072
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α-TeO2:Tm3+/Er3+/Yb3+ and β-TeO2:Tm3+/Er3+/Yb3+ nanoparticles with Li+ doping had been prepared via a hydrothermal method. The nanoparticles were characterized by X-ray diffraction, transmission electron microscopy and upconversion luminescence spectra. The results indicated that the doping of Li+ ions does not change the crystal form and structure of the as-prepared nanoparticles basically. The as-prepared nanoparticles showed the blue emission (476 nm), green emissions (525 nm, 545 nm) and red emissions (659 nm, 667 nm) under 980 nm near-infrared light excitation, respectively, corresponding to energy level transition of 1G4→3H6 of Tm3+ ions, 2H11/2 →4I15/2 and 4S3/2→4I15/2 of Er3+ ions, 4F9/2→4I15/2 of Er3+ ions and 3F2→3H6 of Tm3+ ions. The results also indicated that doping of Li+ ions can increase the luminous intensity of the white light system, and it does not change the white color of the nanoparticles basically. In addition, the upconversion luminescence mechanism of the nanoparticles was analyzed.
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