Abstract
Mechanisms of bandgap-excited photoluminescence in Pr 3+-doped chalcogenide glasses have been studied by examination of composition and temperature dependences, responses to optical pulses, and light-soaking effects. Marked photoluminescence from the Pr 3+ ions at 1.6 μm is observed only in selenide glasses. The temperature dependence and pulsed response are different from those of the host-glass photoluminescence at 1.3 μm. Under prolonged illumination, at room temperature, photodarkening appears with reduction of the Pr 3+ photoluminescence. These observations are discussed on the basis of a model proposed for bandgap-excited photoluminescence in rare-earth-ion doped chalcogenide glasses.
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