Luminescent thulium centers in ZnSe crystals doped with thulium and lithium |
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| Affiliation: | 1. BioNanocomposite Research Center, Department of Food and Nutrition, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemun-gu, Seoul 02447, Republic of Korea;2. Department of Food Hygiene and Quality Control, Faculty of Veterinary Medicine, Urmia University, Urmia, Iran;3. Graduate School, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemun-gu, Seoul 02447, Republic of Korea |
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| Abstract: | Luminescence, absorption and Zeeman effects characteristic of Tm3+ ions in ZnSe crystals doped with Tm and Li are studied. The parallel and perpendicular g-values in the ground state of a center, responsible for the strongest luminescence, are 13·74 and zero, respectively. A model for the center is proposed; the center consists of an interstitial Tm impurity surrounded by four nearest neighboring Se2− ions and by two Zn2+ ions and four coplanar Li+ ions in the next nearest neighbor sites. The local symmetry of the center is tetragonal, D2d. |
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