Borate, Chalcogen, Lanthanoid, Metalloid, Rare earth, Photoluminescence spectra

• B-Ba-Eu-Gd-O
• B-Ba-Eu-O
• B-Eu-La-O
• B-Ba-Eu-O-Y
• B-Ba-Gd-O-Tb
• lanthanoid
• metalloid
• chalcogen
• borate
• rare earth
• monoclinic
• trigonal
• orthorhombic
• hexagonal
• tetragonal