Chalcogen, Rare earth, Hexagonal, Photoluminescence spectra

• Al-Ba-Eu-Mg-O
• Ba-Cl-Eu-O-P
• Al-Ba-Eu-Mg-O-Si
• Ca-Eu-F-O-P
• Ca-Eu-F-O-P-Sr
• chalcogen
• rare earth
• lanthanoid
• luminescent
• alkaline