Energy level diagram, Monoclinic, Rare earth

• Er-La-O-V-Yb
• Er-O-Si-Tm-Y-Yb
• Gd-K-O-P-Tb
• Al-Ce-O-Si-Sr
• Al-Eu-Nb-O-Y
• rare earth
• lanthanoid
• chalcogen
• luminescent
• transitional