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Lanthanide ion (Ln 3+ ) doped Y 2 O 3  materials are used in making display devices. Ln 3+  ions can occupy C 2  and S 6  sites in Y 2 O 3 . In many reported papers, Ln 3+  ions occupy more C 2  site leading to enhanced luminescence intensity of electric dipole transition as compared to that of magnetic dipole transition. In this study, we have prepared Eu 3+  ion doped Y 2 O 3  particles dispersed in silica (SiO 2 ) using urea hydrolysis at 165°C. Among the prepared samples lower heated sample show cubic phase Y 2 O 3  wherease 1400 o C show α-Y 2 Si 2 O 7  and all the samples show the luminescence characteristics of Eu 3+ . In Y 2 O 3 :Eu-SiO 2 , the as-prepared, 500 and 900°C heated samples show the higher luminescence intensity for the electric dipole transition than that of magnetic dipole transition and it is opposite upon annealed at 1400°C. It confirms that Eu 3+  ions in as-prepared, 500 and 900°C heated samples occupy C 2  site (asymmetric environment), whereas in 1400°C heated sample, they occupy the S 6  site (symmetric environment). However, microparticles of the Y 2 O 3 :Eu sample annealed at 1400°C show that Eu 3+  ions occupy more C 2  site as compared to the S 6  site. This study suggests that occupancy of C 2  and S 6  sites in Y 2 O 3  by Eu 3+  ions can be varied by surrounding medium as well as heat-treatment temperature.

Site symmetry dependence on luminescence emission of Y 2 O 3 :Eu 3+ dispersed in silica matrix