Scroll-like
colloidal quasi-two-dimensional CdS
x
Se1–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
x
Se1–x
solid solution nanoplatelets.
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