Disordered, Rare earth, Hexagonal, Photoluminescence spectra

• Al-Ba-Eu-Mg-O
• Ba-Cl-Eu-O-P
• Ca-Eu-F-O-P
• Er-F-Na-Y-Yb
• Ca-Cl-Eu-O-P
• disordered
• rare earth
• lanthanoid
• luminescent
• chalcogen