Divalent Europium in β-Irradiated Aluminoborosilicate Glass

摘要

The reduction processes of Eu~(3+) ions in aluminoborosilicate glasses were studied using both high-temperature melting in air and p-irradiation by time-resolved luminescence and electron paramagnetic resonance spectroscopies. The Eu~(2+) ions produced during the synthesis are characterized by the UV excited broadband luminescence in the blue region due to the 4f~-65d~1l-4f~7 transition. This band revealed the presence more than one Eu~(2+) site participating in the emission with different crystalline fields and with different covalency of surrounding li-gands. In irradiated glasses, the observed redshift of the Eu~(2+) emission band is related to the different relative proportion between Eu~(2+) sites.