B-Eu, Metalloid, Rare earth, Optical properties

• B-Eu-Gd-O
• B-Eu-Gd-O-Y
• B-Eu-I-N
• B-Eu-La-O
• luminescence
• wavelength for luminescence
• values of luminescence
• phonons
• photoluminescence spectra
• rare earth
• metalloid
• lanthanoid
• chalcogen
• nonmetal
• monoclinic
• hexagonal
• trigonal
• orthorhombic
• cubic