Charge separation of excitons and the radiative recombination process in PbBr2 crystals

Authors
Iwanaga, M Watanabe, M Hayashi, T
Citation
M. Iwanaga et al., Charge separation of excitons and the radiative recombination process in PbBr2 crystals, PHYS REV B, 62(16), 2000, pp. 10766-10773
Citations number
22
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICAL REVIEW B
ISSN journal
01631829 → ACNP
Volume
62
Issue
16
Year of publication
2000
Pages
10766 - 10773
Database
ISI
SICI code
0163-1829(20001015)62:16<10766:CSOEAT>2.0.ZU;2-U
Abstract
The photoluminescence (PL) properties at low temperatures have been investi gated in PbBr2 crystals. We find that the blue-green PL band at 2.55 eV (BG band) originates from the intrinsic relaxed state of excitons. The analysi s of the decay curve of the BG band reveals that the excitons relax into ch arge-separated pairs of a self-trapped electron and a self-trapped hole. Th e relaxation of an exciton results from the repulsive correlation between t he electron and hole through acoustic phonons.