Mid-infrared emissions and energy transfer in Ge-Ga-S glasses doped with Dy3+

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作者：
Non-Crystalline Materials Laboratory, Dept. Mat. Sci. Eng./Sch. E., Pohang, Kyungbuk, Korea, Republic of [1 ]
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来源：
J Non Cryst Solids | / 260-265期
关键词：
Composition effects - Doping (additives) - Energy transfer - Germanium compounds - Light emission - Relaxation processes - Stoichiometry - Sulfur;
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摘要：
Effect of sulfur level in Ge-Ga-S (Ge29.1Ga5S65.9, Ge25.8Ga5S69.2 and Ge32.4Ga5S62.6) glasses on the emission and non-radiative relaxation from the 6H11/2 and 6H13/2 levels in Dy3+ was investigated. Emission cross-sections and lifetimes of these two energy levels increased as the amount of sulfur decreased and the magnitude of the non-radiative relaxation decreased. We suggest that these changes in the emission properties show that glass deficient in sulfur, less than its stoichiometric GeS2-Ga2S3 composition, provides better potential as a laser source compared to those with an excess sulfur.
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