(Color online) XRD patterns of (a) the precursor glass and (b) the glass ceramic. Inset: the TEM micrograph of the glass ceramic
EDX spectra from (a) an individual nanocrystal and (b) the glass matrix in the glass ceramic co-doped with 0.1 mol% and 0.8 mol% .
(Color online) Room temperature emission spectra of (a) and (b) single-doped glass ceramics, under 792 and 976 nm excitation, respectively. (c) Emission spectrum of doped polycrystalline film.20 Inset: luminescence decay curve of the single-doped sample recorded at 1543 nm.
(Color online) Room temperature absorption spectra of 0.1 mol% single-doped glass and glass ceramic.
(Color online) Near-infrared broadband emission spectra of the co-doped glass ceramics with different [Tm]/[Er] ratios under the 792 nm excitation.
(Color online) Left: visible upconversion emission spectra of the co-doped glass ceramics with different [Tm]/[Er] ratios excited by 792 nm laser. Right: the variations of red, green emission intensities and red to green intensity ratio: (red/green) versus [Tm]/[Er] ratio.
(Color online) Energy level diagrams of and and energy transfer routes between them. The solid arrows stand for the absorption and emission transitions of rare earth ions, the dashed arrows stand for the nonradiative relaxations, and the curved arrows stand for the energy transfers between and .
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