PHOTO-LUMINESCENCE STUDY OF EXCITONS IN AGBR IN HIGH MAGNETIC-FIELDS

Journal article

The luminescence spectrum of AgBr at 1.6K reveals a number of sharp lines which are associated with excitons bound to residual impurities and crystalline defects. Two lines are identified as excitons bound to iodine ( epsilon b=43 meV) and cadmium ( epsilon b=8 meV). Several lines are observed in the neighbourhood of the phonon-assisted free-exciton emission, two of them corresponding to excitons bound to unidentified centres with energies of 1 meV and 0.25 meV. Electron-hole exchange coupling is found to be weak for excitons bound to the isoelectronic centres and their Zeeman spectra are described quite adequately by a simple L-S coupling scheme. The Zeeman spectra of the unidentified shallow states are found to be qualitatively similar to those of the isoelectronic traps. The g-values obtained decrease with increasing binding energy from ge=2.29 and gh=0.76 for the shallow states to ge=1.97 and gh=0.66 for the iodine trap.

Authors: Bloch, P; Ryan, J

• Publication status: Published
• Journal: JOURNAL OF PHYSICS C-SOLID STATE PHYSICS
• Volume: 13
• Issue: 16
• Pages: 3071-3086
• Publication date: 1980-01-01
• DOI: 10.1088/0022-3719/13/16/014
• ISSN: 0022-3719
• Language: English