The Effect of Na₂O/B₂O₃ Composition Ratio on the Structure and Properties of Cu⁺ Doped Luminescent Glass

Cu⁺-doped alkali borosilicate glasses with different Na₂O contents were prepared by the melting method, and the effects of different R values (R=Na₂O/B₂O₃) on the structure, ion presence state and luminescence properties of Cu⁺-doped alkali borosilicate glasses were investigated. The analysis by FT-IR and Raman spectroscopy shows that, with the increase of R value of the glass, the [BO₃] in the structure of Cu⁺-doped alkali borosilicate glass transforms into [BO₄] and the number of non-bridging oxygen in the glass network appears to be slightly increased. The absorption spectra and EPR analysis reveal that the Cu⁺ content in the glass gradually decreases and the Cu²⁺ content gradually increases as the R value of the glass increases. XPS and PL tests further indicate that the transformation of the octahedral coordination structure of Cu⁺ to the octahedral coordination structure of Cu²⁺ and the cubic coordination structure of Cu⁺ occurs in the glass as the R value of the glass increases. This transformation can effectively reduce the concentration quenching phenomenon of Cu⁺ and improve the fluorescence luminescence intensity of the glass samples. Meanwhile, the samples were found to have luminescence tunability as well as good thermal stability.