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• 作者：Natalia N. SchlenskayaYuanzhao Yao ; Takaaki Mano ; Takashi Kuroda ; Alexey V. Garshev ; Vadim F. Kozlovskii ; Alexander M. Gaskov ; Roman B. Vasiliev ; Kazuaki Sakoda
• 刊名：Chemistry of Materials
• 出版年：2017
• 出版时间：January 24, 2017
• 年：2017
• 卷：29
• 期：2
• 页码：579-586
• 全文大小：561K
• ISSN：1520-5002

文摘

Scroll-like colloidal quasi-two-dimensional CdS_xSe_1–x nanoplatelets (NPLs) with a thickness of five monolayers and average lateral dimensions of 100 nm over the whole composition range (0 ≤ x ≤ 1) were synthesized by using a mixture of chalcogenide precursors. According to X-ray diffraction and X-ray energy dispersive spectroscopy mapping in a scanning transmission electron microscope, as-synthesized NPLs are solid solutions with a uniform elemental distribution in each individual nanoplatelet. A change in composition leads to the continuous shift and gradual broadening of exciton absorption and photoluminescence (PL) lines in the visible blue and near-ultraviolet 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, and Stokes shift) starting from a sulfur content of ∼40% in alloyed NPLs. This behavior may be attributed to the local composition fluctuations within CdS_xSe_1–x solid solution nanoplatelets.