Photoluminescence of Eu- and Sm-doped LiInO2 phosphor powders
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Lithium-indium oxide doped with Eu3+ or Sm3+ is prepared by a solid-state chemistry method and its properties are analyzed with respect to its possible application as a phosphor material. X-ray diffraction confirmed that the present synthesis yields a product in tetragonal structural form (space group I4(1)/amd) with no impurity phases. The optical band gaps of 3.4 eV for the Eu3+ sample and 3.5 eV for Sm3+ are found. Photoluminescence emission measurements showed that rare-earth ions substitute In in sites of D-2d symmetry with single-exponential emission decays of 1.5 ms for the Eu3+-doped sample and 2.3 ms for the Sm3+ case.