Hexagonal, Photoluminescence spectra, Rare earth

• Al-Ba-Eu-Mg-O
• F-Gd-Ho-Na-Yb
• Er-F-Gd-Na-Yb
• Ba-Cl-Eu-O-P
• Al-Ba-Eu-Mg-O-Si
• rare earth
• lanthanoid
• luminescent
• chalcogen
• alkaline