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Luminescence of Cs 4 PbBr 6 Aggregates in As‐Grown and in Annealed CsBr:Pb Single Crystals
Author(s) -
Babin V.,
Fabeni P.,
Mihokova E.,
Nikl M.,
Pazzi G.P.,
Zazubovich N.,
Zazubovich S.
Publication year - 2000
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/1521-3951(200005)219:1<205::aid-pssb205>3.0.co;2-8
Subject(s) - luminescence , excited state , materials science , single crystal , photoluminescence , analytical chemistry (journal) , kinetic energy , absorption spectroscopy , polarization (electrochemistry) , spectral line , crystallography , chemistry , optics , optoelectronics , atomic physics , physics , chromatography , quantum mechanics , astronomy
Luminescent aggregates of the type of Cs 4 PbBr 6 dispersed in a CsBr crystal lattice have been observed for the first time in as‐grown and in annealed (at 160 to 260 °C for 20 h) CsBr:Pb single crystals with a sufficiently large lead concentration (0.3 to 1.8 mol% in the melt). Absorption spectra as well as spectral, polarization and kinetic characteristics of their luminescence peaking near 3.3 eV and excited near 4.0 eV and 5.2 to 5.1 eV have been studied at 4.2 to 200 K. The characteristics of the Cs 4 PbBr 6 aggregates have been compared with those of a Cs 4 PbBr 6 single crystal and with the characteristics of Pb 2+ centres in a quenched CsBr:Pb crystal. The origin and the structure of the corresponding relaxed excited states have been discussed.