Abstract
Photoluminescence spectra are reported for the first time for (BaS) 1− x (SrTe) x ( x = 0.1, 1.0, and 5.0 wt%) powders. Changes in the luminescent spectra were attributed to bound exciton recombination at substituted Te on S (Te s) sites. Peaks were observed at 420 and 465 nm, and were attributed to singlet and doublet Te emission, respectively. The binding energies and thermal quenching activation energies for the singlet and doublet excitons were found to be 630 and 860 meV, and 45 and 58 meV, respectively. The thermal quenching activation energy for singlet excitons was attributed to the energy required to excite the bound electron into the conduction band of the BaS host, and for doublet excitons was attributed to charge transfer between Te s and/or nonradiative quenching centers.
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