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Structural and Optical Properties of Mn2+-Doped ZnCdS/ZnS Core/Shell Quantum Dots: New Insights in Mn2+ Localization for Higher Luminescence Sensingстатья
Дата последнего поиска статьи во внешних источниках: 12 июня 2024 г.
- Авторы: Nadtochenko Victor, Cherepanov Dmitrii, Kochev Sergei, Motyakin M., Kostrov Andrei, Golub Alexandre, Antonova Olga, Kabachii Yurii, Rtimi Sami
- Журнал: Journal of Photochemistry and Photobiology A: Chemistry
- Год издания: 2022
- Издательство: Elsevier BV
- Местоположение издательства: Netherlands
- Номер статьи: 113946
- DOI: 10.1016/j.jphotochem.2022.113946
- Аннотация: The synthesis methods (one- or two-pot) of stable Mn2+ doped ZnxCd1-xS and ZnxCd1-xS/ZnS quantum dots are reported in this study with a quantum yield (QY) of ∼ 60% in anhydrous and ∼ 30% in aqueous media for Mn2+ photoluminescence (PL). Mn2+-localization in the prepared QDs was characterized by electron paramagnetic resonance (EPR). Structural parameters were established by X-ray diffraction (XRD). Femtosecond transient absorption spectroscopy, time-gated luminescence measurements allowed to elucidate the relaxation dynamics of exciton, traps and 4T1 excited Mn2+. High-order derivative spectral analyses of the photoluminescence (PL) bands of Mn2+ accompanied with Gauss peaks decomposition have been employed. This analysis revealed narrow peaks in the spectral range from green (∼537 nm) to far-red (∼655 nm). These PL peaks can be associated with different locations of Mn2+ in QDs that are characterized by different strengths of the crystal field around Mn2+. Dopant localization sites and relaxation processes control the quantum yield of Mn2+, providing higher photocatalytic activity, pronounced electroluminescence, and higher sensitivity.
- Добавил в систему: Черепанов Дмитрий Александрович