Abstract
Zinc bismuth borate (ZBB) glasses with chemical composition of (60−x) B2O3: 30Bi2O3: 10ZnO: xEu2O3 for different Eu2O3 concentrations of x=1, 3, 5, 7 and 9mol% were prepared by the conventional melt quenching technique. The density and molar volume of the glasses have been found to increase with Eu2O3 concentration. The IR studies indicated that these glasses were made up of [BiO3], [BO3], [BO4] and [BO] basic structural units. The absorption spectra had revealed two intense bands due to 7F0→7F6 (2076nm) and 7F1→7F6 (2198nm) transitions in the NIR regions. The fractional populations of the (7F0) and (7F1) ground state were 65% and 35%, respectively. Five luminescence bands were observed at 579nm (5D0→7F0), 589nm (5D0→7F1), 613nm (5D0→7F2), 651nm (5D0→7F3) and 696nm (5D0→7F4), when excited by a 465nm source, the most intense red emission was found at 613nm. A shorter decay time of 5D0 excited state was found with increasing of Eu3+ concentration as more asymmetries were created around Eu3+. For comparison, further investigations were carried out with two other glass structures; bismuth borate glass (BB) and zinc borate glass (ZB), doped with Eu3+ in the same range. The ZBB glasses have exhibited with the highest emission intensity especially at 613nm; the intensity for the ZBB was around 7 times of the ZB and twice of the BB glasses.
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