Chalcogen, Transitional, Energy level diagram, Tetragonal

• Er-O-V-Y-Yb
• Ca-Eu-O-W
• Ba-La-O-Tm-Yb-Zn
• Er-Gd-O-V-Yb
• Er-O-P-Y-Yb
• chalcogen
• transitional
• luminescent
• rare earth
• lanthanoid