Spectral-Luminescent and Optical Properties of Antimony-Doped Yttrium-Alumoborate Glasses

Fused glasses of Y₂О₃–Al₂O₃–В₂О₃ system with Sb₂O₃ additives have been synthesized and their spectral-luminescent and optical properties have been investigated. It is found that the doping used leads to the appearance of intense UV absorption and a decrease in the optical band gap width and the Urbach energy. Their luminescence is represented by a broad weakly structured band extending from the near-UV to the near-IR spectrum regions and caused by the superposition of ³P₁→¹S₀ bands of different types of Sb³⁺ optical centers and Sb³⁺→Sb⁵⁺ charge transfer band. The quantum yield of such luminescence at room temperature and band-to-band excitation for weakly doped glass is close to 20%. Its decay kinetics at T = 298 K and 77 K have been studied and the reasons preventing the quantum yield increase have been considered.

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