Fabrication of rare-earth doped transparent ceramics for white light sources and construction of evaluation system of optical properties

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We have carried out fabrication of rare-earth doped transparent ceramics for white light sources and constructed evaluation system of optical properties. Transparent ceramics with compositions of (Y_<0.99-x>Gd_xCe_<0.01>)_3Al_5O_<12> were prepared from nanopowders prepared by co-precipitation methods. Sintered ceramics with 1mm-thickness showed good transparency of 80% at 800nm and showed yellow photoluminescence by blue LED excitation (465nm). The peak wavelength of PLE shifted from 530nm to 560nm with increasing Gd content.