Alkali, Nonmetal, Transitional, Luminescence, Trigonal

• Ba-Eu-K-O-Sm-W
• Ho-Li-O-Ta
• Bi-Na-O-Pr-Ti
• Bi-Er-Na-O-Ti
• Ba-K-O-Sm-W
• photoluminescence spectra
• wavelength for luminescence
• values of luminescence
• luminescence lifetime
• transitional
• nonmetal
• alkali
• chalcogen
• luminescent