Abstract
High refractive index glasses based on SiO2-(BaO + ZrO2)-TiO2 were synthesized for road sign applications with nd > 1.9. Although the refractive index increased with the addition of TiO2, visible transmittance was deteriorated with colorization of the glasses with increasing TiO2. Visible light absorption by the multi-valenced Ti-ions within the glass matrix was responsible for the change in color and transmittance. To improve transmittance and guarantee the retro-reflectivity of the glass beads, various transition metal oxides (TMOs) CuO, NiO, MnO and CoO were introduced for color control. The transmittance change with various TMOs was monitored, and a glass with CoO showed a noticeable change in color as well as an increase in transmittance. The valence change of Ti-ions was inspected by XPS, photo-luminescence (PL) and photo-luminescence excitation (PLE) spectra of the glasses, to elucidate the color change.
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This work was supported by Kongju National University in 2020 and the Technology Innovation Program (10063275, Development and evaluation of high refractive index (nd>1.9) glass beads for road marking) funded By the Ministry of Trade, Industry & Energy (MOTIE, Korea).
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Lee, J.H., Lee, H., Choi, Y.G. et al. Decolorization of high refractive index glass based on SiO2-(BaO + ZrO2)-TiO2 using transition metal oxides. J. Korean Ceram. Soc. 59, 514–526 (2022). https://doi.org/10.1007/s43207-022-00187-z
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DOI: https://doi.org/10.1007/s43207-022-00187-z