Energy level diagram, Orthorhombic, Rare earth

• Ga-La-O-Tm-Yb
• Eu-Li-N-Si
• Ce-Er-O-Sr-Yb
• Bi-Er-Na-O-Ti
• Bi-Ca-Eu-O-Ti
• rare earth
• lanthanoid
• chalcogen
• luminescent
• alkaline