The fundamental optical absorption of Cs 4 PbBr 6 crystals, which are built up of nearly regular Pb 2+ (Br - ) 6 octahedra mutually bound by Cs + ions, exhibits novel features: despite the crystalline entity of Cs 4 PbBr 6 , it shows oscillator-like absorption peaks and a wide window just above the first peak. The Cs + ions prevent the Pb 2+ 6s and 6p states from taking part in the construction of extended states. These states form a set of localized states confined to within respective octahedra, similar to the case of isolated Pb 2+ ions doped in face-centred cubic alkali halide crystals.
No takes yet. Share an insight, caveat, or question.
Kondo et al. (2002) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: