Energy gap for direct transition, Lanthanoid, Non-disordered, Rare earth

• Ce-O
• Cu-La-O
• Cs-Tb-Te-Zn
• Co-La-O
• Eu-O
• rare earth
• lanthanoid
• non-disordered
• chalcogen
• cubic
• tetragonal
• trigonal
• orthorhombic
• hexagonal