Photostimulated luminescence phenomenon has been observed in Eu2÷-doped borate glasses. In this work, europium ions doped in borate glasses are studied by europium L m x-ray absorption spectroscopy to reveal the relationship between optical function and local structure. XANES spectra showed that a part of Eu 2÷ BN15 converted to E u 3÷ upon the irradiation of x-ray. The nearest BN20 neighbor Eu-O distance in Eu3*-doped glasses obtained by BN25 EXAFS analysis is longer than that of Eu20 3 by 0.02-0.09~,. The BEN10 BEN15 oxygen coordination number of europium in EuZ÷-doped glass is BEN20 different from that of the Eu3÷-doped glass with the same BEN25 composition while the nearest neighbor Eu-O distances are BEN30 closely the same. The coordination number of highly Eu3÷-doped glasses decreased with an increase of Na20 content. Conference Proceedings
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Shimizugawa et al. (1999) studied this question.