Abstract
The electron–phonon coupling is firstly investigated in the Dy3+-doped Ge30Ga5Se65 and 0.9Ge30Ga5Se65+0.1CsBr glasses. Using the Judd–Ofelt theory, the intensity parameters, spontaneous emission probabilities and branching ratios of Dy3+ ions are calculated. Measured lifetimes (τm) of 6H11/2 manifold are measured in temperature region of 20–300K. Results show that local phonon modes and electron–phonon (e–p) coupling strengths are changed in the addition of CsBr. The frequency of the phonon vibration was decreased to 268cm−1 with CsBr addition to selenide glasses. The value of e–p coupling strength decreases from 0.456 in Ge30Ga5Se65 to 0.048 in 0.9Ge30Ga5Se65+0.1CsBr. It is clear that the e–p coupling strengths decrease considerably with the addition of CsBr to Ge30Ga5Se65 glass.
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