INTENSIFIED PHOTOLUMINESCENCE OF EU3-SEPARATED BOROSILICATE GLASS( INTHE PHASE)

Eu3+ containing 3Na(2)O . 42B(2)O(3). 55SiO(2) (mol%) glass was isothe rmally heat-treated for phase separation. The photoluminescence (PL) b ehavior of Eu3+ was investigated. It was found that PL intensity of D- 5(0)-->F-7(2) transition of Eu3+ increases with evolution of phase sep aration. A maximum 6.5 times increment in the PL intensity can be obta ined after phase separation as compared to that of the as-cast sample. Moreover, the maximum increment of the PL intensity seems to be relat ed to the texture induced by phase separation, the droplet texture bei ng superior to the interconnected one. The mechanism of augmentation o f the PL intensity was interpreted in terms of the derived expression of the PL intensity. It was then suggested that the induced interface after phase separation, causing remarkable increase in light scatterin g intensity and therefore notable increase in the population of Eu3+ O n the D-5(0) energy level, accounted for significant enhancement in th e PL intensity. On the other hand, from the emission intensity ratio o f D-5(0)-->F-7(2) to D-5(0)-F-7(1) transitions of Eu3+, it was estimat ed that Eu3+ partitioned into the berate-rich phase after phase separa tion.