The Effect of Tb[sup 3+] Co-Doping on the Photoluminescence of (Sr,Ba)[sub 2]SiO[sub 4]:Eu[sup 2+]

We introduced co-dopants into well-known orthosilicate phosphors such as and . co-doping had a positive influence on the overall photoluminescence (PL) intensity of , and , . In the absence of barium incorporation, co-doping induced phase transformation of the host from the β to the α' phase, such that the peak location redshifted and the peak intensity decreased significantly. For and , we detected inactive energy transfer from to , despite the fact that the PL intensity was improved by the co-doping, meaning that the emission never decreased as the concentration increased. There was clear evidence supporting an energy transfer between and for , despite no conspicuous practical improvement in the PL properties. The positive influence of co-doping comes not from the energy transfer, but, rather, simply from the local structure change around the activator in the host.