Effect of Li[sup +] on the Luminescence Properties of Gd[sub 2]O[sub 3]:Eu Phosphor

-activated phosphor was synthesized by a combinatorial polymerized-complex method, which was based on the polymeric complex using citric acid and ethylene glycol. The incorporation of divalent metal ion in is not effective for enhancing the luminescence quantum yield. Co-doping with ion leads to an increase of the quantum yield because substitution in the lattice led to a decrease in interstitial oxygen and hence increase in hole concentration. It is indicated that the decrease in interstitial oxygens led to a decrease in the competitive absorption and hence yielded a higher quantum yield. Also, it can be expected that the ions are introduced into the site with higher population in the lattice so that the doped has a higher quantum yield.