Chalcogen, Rare earth, Transitional, Photoluminescence spectra

• Al-Ce-O-Y
• Eu-O-Y
• Ca-Eu-Mo-O
• Ca-Eu-O-W
• Eu-O-Sr-W
• transitional
• chalcogen
• rare earth
• luminescent
• lanthanoid
• tetragonal
• monoclinic
• cubic
• orthorhombic
• trigonal