Griebner

• Gd-Na-O-W
• Gd-Na-O-W-Yb
• Lu-Na-O-Tm-W
• Na-O-Tm-W-Y
• La-Na-O-Tm-W
• optical properties
• structural properties
• luminescence
• photoluminescence spectra
• electronic and electrical properties
• transitional
• chalcogen
• rare earth
• lanthanoid
• alkali
• tetragonal
• trigonal