Scroll-like alloyed CdSxSe1-x nanoplatelets: facile synthesis and detailed analysis of tunable optical propertiesстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 5 июня 2017 г.
Аннотация:Scroll-like colloidal quasi-two-dimensional (2D) CdSxSe1-x nanoplatelets (NPLs) with 5 monolayers (ML) thickness and average 100 nm lateral dimensions in the whole composition range (0 ≤ x ≤ 1) were synthesized by using the mixture of chalcogenide precursors. According to X-ray diffraction (XRD) and X-ray energy dispersive spectroscopy mapping in scanning transmission electron microscope (STEM-XEDS) as-synthesized NPLs are solid solutions with uniform elemental distribution in each individual nanoplatelet. Composition change leads to the continuous shift and gradual broadening of exciton absorption and photoluminescence (PL) lines in the visible blue and near-UV light range. Detailed analysis of optical properties including temperature-dependent PL spectroscopy revealed the nonmonotonic behavior of several optical parameters (average phonon temperature, electron-phonon interaction coefficient, the Stokes shift) starting from about 40% of sulfur content in alloyed NPLs. This behavior may be attributed to the local composition fluctuations within CdSxSe1-x solid solution nanoplatelets.