Abstract:
Two types of radiative transitions were observed in the low-temperature photoluminescence spectra of Pb1−xEuxTe (0 ≤ x ≤ 0.09) solid solutions: an intense line corresponding to the transitions from the conduction to the valence band and a series (up to 15) of narrow lines corresponding to the transitions from the hybridized conduction band to the split Eu3+ levels. The intensity of the discrete lines increases with x, and their energies (and intensities) weakly depend on the temperature. The absorption and emission of the discrete lines are caused by the 4f7(8S7/2) ↔ 4f6(7FJ)[L6− + 5dt2g] transitions.