Self-Assembled PbS/CdS Quantum Dot Films with SwitchableSymmetry and Emission
2019
Precise tuning of
optoelectronic properties of solid-state materials
assembled from colloidal semiconductor nanocrystals (quantum dots,
QDs) is of utmost importance for future optoelectronic technologies.
Tuning can be achieved through varying composition, size, chemical
environment, and arrangement of QDs; however, little is known about
the possibility of achieving dynamic, reversibly switchable systems
of QDs. Here, we report on the assembly of PbS/CdS core/shell quantum
dots films, which exhibit reversibly switchable symmetry. Dynamic
nanostructured assemblies were achieved by conjugating QDs with the
two types of thermoresponsive, promesogenic ligands. The 3D arrangement
of PbS/CdS nanoparticles in thin films was characterized by means
of temperature-dependent small-angle X-ray measurements. Using optical
techniques, we show that structural reconfiguration allows modulating
the PL spectrum of QD solids in a reversible and predictable manner.
Moreover, fabricated QD solids enable 3 orders of magnitude faster
switchability than state-of-the-art examples of liquid crystalline
quantum dots. We anticipate that the present methodology will allow
for the assembly of various QD solids where structure and optoelectronic
properties can be dynamically controlled.
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