Alkaline, Chalcogen, Transitional, Optical properties, Trigonal

• La-Mn-O-Sr
• Ca-Mn-O
• Li-Mg-Nb-O
• Ca-Cu-O-Ti
• Ca-Eu-O-P-Zr
• luminescence
• phonons
• optical spectra
• wavelength for luminescence
• photoluminescence spectra
• transitional
• chalcogen
• alkaline
• disordered
• rare earth