Alkaline, Chalcogen, Optical properties, Trigonal

• La-Mn-O-Sr
• Ca-Eu-O-P
• Ca-Mn-O
• B-Ba-O
• Li-Mg-Nb-O
• luminescence
• phonons
• photoluminescence spectra
• wavelength for luminescence
• Raman spectra
• alkaline
• chalcogen
• transitional
• disordered
• rare earth