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Differentiation between shallow and deep charge trap states on single poly(3-hexylthiophene) chains through fluorescence photon statistics | | Kristin S. Grussmayer
; Florian Steiner
; John M. Lupton
; Dirk-Peter Herten
; Jan Vogelsang
; | | Date: |
9 Dec 2016 | | Abstract: | Blinking of the photoluminescence (PL) emitted from individual conjugated
polymer chains is one of the central observations made by single-molecule
spectroscopy (SMS). Important information, e.g., regarding excitation energy
transfer, can be extracted by evaluating dynamic quenching. However, the nature
of trap states, which are responsible for PL quenching, often remains obscured.
We present a detailed investigation of the photon statistics of single
poly(3-hexylthiophene) (P3HT) chains obtained by SMS. The photon statistics
provide a measure of the number and brightness of independently emitting areas
on a single chain. These observables can be followed during blinking. A
decrease in PL intensity is shown to be correlated with either (i) a decrease
in the average brightness of the emitting sites; or (ii) a decrease in the
number of emitting regions. We attribute these phenomena to the formation of
(i) shallow charge traps, which can weakly affect all emitting areas of a
single chain at once; and (ii) deep traps, which have a strong effect on small
regions within the single chains. | | Source: | arXiv, 1612.2980 | | Services: | Forum | Review | PDF | Favorites | |
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