Abstract

The effect of impurity oxide on the luminescent property of yttrium oxide activated by Eu³⁺ was reported by Fuller¹⁾. In this report it was found that lanthanum oxide had no influence on the luminescent property of EU³⁺-activated yttrium oxide phosphor when 0.067m/o lanthanum oxide was added. Meanwhile the solid solution between Y₂O₃ and La₂O₃ is found to be stable till about 20 mol% of La₂O₃ between 700 and 1400°C.²⁾ We found that the addition of La₂O₃ to Eu³⁺-activated Y₂O₃ made the intensity of luminescence under 2537Å stronger.

© 1984 Optical Society of America