A novel Tm³⁺/Er³⁺/Yb³⁺ triply-doped glass ceramics containing BaF₂ nano-crystals are successfully prepared. Fluoride nanocrystals BaF₂ are successfully precipitated in glass matrix, which is affirmed by the X-ray diffraction results. The intense blue (476 nm), green (543 nm), and red (656 nm) emissions of the glass ceramics are simultaneously observed at room temperature under 980-nm excitation, and the emission luminescence intensity increases significantly compared with the precursor glass, which is attributed to the low phonon energy of fluoride nanocrystals when rare-earth ions are incorporated into the precipitated BaF₂ nanocrystals. Under 980-nm excitation at 400 mW, the international commission on illumination (CIE) chromaticity coordinate (X = 0.278, Y = 0.358) of the tridoped oxyfluoride glass ceramics' upconversion emissions is close to the standard white-light illumination (X = 0.333, Y = 0.333). The results indicate that Tm³⁺/Er³⁺/Yb³⁺ triply doped glass ceramics can act as suitable materials for potential three-dimensional displays applications.

© 2010 Chinese Optics Letters

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