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Typical visible upconversion luminescence from the holmium-ytterbium doped sample.
Simplified energy-level diagram for the thulim-holmium-ytterbium system.
(Color online) Upconversion emission spectra of fluorogermanate vitroceramic samples doped with (a) Ho, (b) , (c) , and (d) excited at . The photographs and spectra were obtained with a fixed pump power at .
coordinate diagram showing the chromaticity points of the emissions in a triply doped sample excited at .
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