Premium
Indirect Transitions in Spectra of BiI 3 Crystals at Low Temperatures
Author(s) -
Shekhmametev R. I.
Publication year - 1974
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/pssb.2220660141
Subject(s) - exciton , spectral line , luminescence , absorption (acoustics) , phonon , absorption spectroscopy , atomic physics , absorption edge , molecular physics , chemistry , materials science , condensed matter physics , physics , optics , band gap , optoelectronics , quantum mechanics
Abstract Absorption and luminescence spectra of BiI 3 crystals have been studied in a temperature interval of 1.6 to 77°K. In the vicinity of the intrinsic absorption edge steps in the absorption contour have been detected (steps A, B, C, A T , B T ), having a positive coefficient of temperature shift. These steps can be related to indirect exciton transitions with phonon emission and absorption. Emission of the indirect exciton has been observed, which belongs to the spectral region where the inverse hydrogen‐like series lines of absorption and luminescence are located. The energy of the indirect exciton formation ( E ik = 16205 cm −1 ) and of phonons taking part in indirect transitions have been determined.