Decay Time of 2.09 eV Luminescence of S2--Vacancy Centers and Their Optical and Thermal Stability in NaCl:S2 Crystals |
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Authors: | Rongbin Ye Koji Ohta Mamoru Baba Kazume Nishidate |
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Affiliation: | (1) Faculty of Engineering, Iwate University, Department of Electrical and Electronic Engineering, 4-3-5, Ueda, Morioka 020-8551, Japan |
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Abstract: | An investigation was carried out on decay time of the 2.09 eV emission of S2–vacancy pair centers in NaCl crystals. When the crystal was excited by a pulsed 337 nm light from an N2 laser, the 2.09 eV yellow luminescence principally decayed with the lifetime of 14.2 μs at low temperatures, and exhibited a weak thermal quenching with an activation energy of 51.3 meV above about 150 K. Such S2--vacancy pair centers responsible for the 2.09 eV luminescence were thermally stable at room temperature, and not bleached even when exposed to ultraviolet lights below about 5 eV. Thus, the 2.09 eV emission center possibly can be used as a solid-state laser active center working at room temperature. |
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Keywords: | sodium chloride sulfur photoluminescence decay time nonradiative transition laser active center solid-state laser |
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