Photoluminescence
Blinking from Single CdSeS/ZnS Quantum
Dots in a Conducting Polymer Matrix
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Abstract
Quantum
dot nanocrystals (NQDs) present within organic conducting
(polymer) host environments form hybrid organic–inorganic materials
that are applied in a range of technologies such as light emitting
diodes or solar cells. Understanding hole-transport and exciton dynamics
in these hybrid materials is central to device performance and efficiency.
Integral to hole-transport is the understanding of multiexciton processes
such as charged excitons as well as neighbor–neighbor NQD interactions
(on the nano and micrometer length scales). Studied here are the photoluminescence
dynamics of single alloyed NQDs in conducting (or insulating) polymer
environments. We find that conducting polymers (through hole transport)
affect the presence and dynamics of charged excitons relative to insulating
environments. The presence of such charged excitons induces a change
in blinking dynamics with a corresponding increase in photoluminescence
correlation between neighboring NQDs found using spatiotemporal statistical
analysis. Understanding such phenomena advances the understanding
of photoluminescence processes central to device design