Chalcogen, Lanthanoid, Tetragonal, Wavelength for luminescence

• Eu-O-V-Y
• Ca-Eu-Mo-O
• Ca-Eu-O-W
• Ba-Eu-Gd-O-Zn
• Ca-Mo-O-Tb
• rare earth
• chalcogen
• lanthanoid
• luminescent
• transitional