Abstract
A record peak luminescence intensity of the 5D0 → 7F4 transition in Eu3+ ions and broadening of their UV excitation band are obtained by doping of Eu-containing alumina gel films with bismuth oxyfluoride and subsequent thermal treatment at T ≥ 700°C. The results obtained are explained by the formation of complex Eu—Bi centers with C3V symmetry in the Al2O3 structure, efficient migration of excitations from EuAlO3 crystallites to these centers, and the sensitization of the luminescence of the rare-earth activator by Bi3+ ions.
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