| Decolorization of high refractive index glass based on SiO2‑(BaO+ ZrO2)‑TiO2 using transition metal oxides |
Jung Hee Lee1, Hansol Lee1, Yong Gyu Choi2, In Gun Kim3, Woon Jin Chung1
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1Institute for Rare Metals and Division of Advanced Materials Engineering, Kongju National University, 1223-24 Cheonan-daero, Seobuk-gu, Cheonan, Chungnam 31080, Republic of Korea
2Department of Materials Science and Engineering, Korea Aerospace University, Goyang 10540, Republic of Korea
3R&D New Business Division Team, Unique Technology Integral Corporation, Yesan 32446, Republic of Korea |
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Received: October 15, 2021; Revised: December 6, 2021 Accepted: January 13, 2022. Published online: July 31, 2022. |
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| ABSTRACT |
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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-refectivity 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 photoluminescence excitation (PLE) spectra of the glasses, to elucidate the color change. |
| Key words:
Glass beads · Refractive index · Road sign · Color control |
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