Abstract
Luminescence of TlBr crystals highly excited by a nanosecond pulsed-dye laser (3.4 eV) at the bath temperature ∼ 8.5 K was studied. Two emission lines labeled A (∼ 2.98 eV) and B (∼ 2.62 eV) were found, which show typical behavior of the electron-hole plasma recombination radiation. The A-line is assigned to the recombination of e-h pairs in the direct gap ( X + 6− X - 3) and the B-line to the simultaneous recombination in the indirect gap ( X + 6− R - 6). Condensation of carriers into an electron-hole liquid was not observed.
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