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J. Korean Ceram. Soc. > Volume 59(4); 2022 > Article
Journal of the Korean Ceramic Society 2022;59(4): 514-526.
doi: https://doi.org/10.1007/s43207-022-00187-z
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
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
Correspondence  Woon Jin Chung ,Email: wjin@kongju.ac.kr
Received: October 15, 2021; Revised: December 6, 2021   Accepted: January 13, 2022.  Published online: July 31, 2022.
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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