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- W1970494930 abstract "We have investigated infrared-to-visible upconversion luminescence of Er3+ in bismuth–lead–germanate glasses. The UV cutoff wavelength is shortened while its lifetime is increased almost linearly, with PbF2 substituting for PbO in the bismuth–lead–germanate glasses. Three emissions centred at around 529, 545 and 657 nm are clearly observed, which are identified as originating from the 2H11/2→4I15/2,4S3/2→4I15/2 and 4F9/2→4I15/2 transitions, respectively. It is noted that all the upconversion emission intensities increase with PbF2 concentration increasing. The ratio between the intensities of red and green emissions increases with the increasing of PbF2 content. Energy transfer processes and nonradiative phonon-assisted decays account for the populations of the 2H11/2,4S3/2 and 4F9/2 levels. The quadratic dependence of fluorescence on excitation laser power confirms a two-photon process to contribute to the upconversion emissions." @default.
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- W1970494930 date "2007-03-20" @default.
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- W1970494930 title "Laser-diode excited intense upconversion luminescenceof Er 3+ in bismuth–lead–germanate glasses" @default.
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- W1970494930 doi "https://doi.org/10.1088/1009-1963/16/4/050" @default.
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