Abstract
The effect of the addition of copper metal or copper oxide on lithium tetraborate glass was studied using X-ray powder diffraction, Optical, density and FTIR. The effect of adding Cu metal has a large effect than the addition of CuO and contributes to increase the NBOs than CuO. And the addition of Cu metal increases the homogeneity of lithium tetraborate glass. The glass sample containing 2 mol % CuO has the higher value of optical band gap Egopt, lower the fraction of four-coordination boron atoms N4 and Urbach energy (Eu) than the other samples containing different copper metal or copper oxide concentration. And the decrease in Urbach energy indicating that decreasing localized states in forbidden gap due to decrease in NBOs. The glass sample containing 2 mol % CuO can be used as a narrow band color filter (band width = 250, band half width = 130 and band center = 486 nm).
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