PHOTOLUMINESCENCE CHARACTERISTICS OF Eu^3+ DOPED IN PHASE SEPARATED BOROSILICATE GLASS

概要

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The 6Na_2O・31B_2O_3・63SiO_2(in mol%)glass was chosen. The photoluminescence(PL)characteristics of Eu^3+ doped in the glass, which was subjected to different phase separated heat treatments, were investigated systematically. It was found that PL intensity of ^5D_0→^7F_2 transition of Eu^3+ increased with phase separation developing. Furthermore, the maximum PL intensities obtained by the different heat treatment processes seem to depend on the morphology induced by phase separation, the droplet morphology having the advantage over the interconnected one with the PL intensities of 6.4 and 5.5 times as high as that in the as-cast sample, respectively. The mechanism of enhancement of the PL intensity was then discussed on the basis of the derived expression of the PL intensity. It was concluded that the induced interface after phase separation, engendering significant increase in light scattering intensity and thereby notable increase in the population of Eu^3+ on the ^5D_0 energy level, accounted for considerable increase in the PL intensity. On the other hand, from the emission intensity ratio of the ^5D_0→^7F_2 to ^5D_0→^7F_1 transitions(R)of Eu^3+, the phases into which Eu^3+ segregated after various phase separation processes were estimated.
社団法人日本材料学会の論文
1998-09-15