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(Color online) Typical upconversion emission spectra from (a) , (b) , and (c) (mol %) codoped glass ceramics (denoted as GC5100, GC5010, and GC0210, respectively). The inset of (c) shows the dependence of the emission intensity ratio of red to green on content for the codoped glass ceramics; the line is a guide for the eyes.
(Color online) Schematic diagram illustrating the mechanisms of sensitized or upconversion luminescence and the energy transfers between and .
(Color online) Upconversion emission spectra from (a) , (b) , (c) , and (d) (mol %) triply doped glass ceramics (denoted as GC5102, GC5105, GC5110, and GC5120, respectively) under excitation; all the emissions are normalized to the green emission band.
(Color online) CIE coordinate diagram showing the chromaticity points of the upconversion luminescence in the glass ceramics; the inset is the photograph of the white light luminescence in the GC5105 sample.
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