Alkali, Chalcogen, Nonmetal, Optical properties, Tetragonal

• H-K-O-P
• Bi-Na-O-W
• K-O-V
• Br-C-H-K-N-O-Pt
• B-Cu-Li-O
• luminescence
• phonons
• photoluminescence spectra
• wavelength for luminescence
• optical absorption
• chalcogen
• nonmetal
• alkali
• transitional
• disordered