Fluorescence and electroluminescence of J-aggregated polythiophene monolayers on hexagonal boron nitride
Publication Date
September 15, 2020
Creators
Description
The photophysics of a semiconducting polymer is manipulated through molecular self-assembly on an insulating surface. Adsorption of polythiophene (PT) monolayers on hexagonal boron nitride (hBN) leads to a structurally-induced planarization and a re-balancing of inter- and intra-chain excitonic coupling. This conformational control results in a dominant 0-0 photoluminescence peak and a reduced Huang-Rhys factor, characteristic of J-type aggregates, and optical properties which are significantly different to both PT thin films and single polymer strands. Adsorption on hBN also provides a route to explore electroluminescence from PT monolayers though incorporation into hybrid van der Waals heterostructures whereby the polymer monolayer is embedded within a hBN tunnel diode. In these structures we observe up-converted singlet electroluminescence from the PT monolayer, with an excitation mechanism based upon inelastic electron scattering. We argue that surface adsorption provides a methodology for the study of fundamental optoelectronic properties of technologically-relevant polymers.
Collection dates:
01.08.2018 - 01.04.2020
Associate publ. DOI
Subjects
Subjects (JACS)
Subjects (LC)
Divisions
University of Nottingham, UK Campus
Other
Data type
Raw data files: AFM images (.ibw), photoluminescence and electroluminescence spectra (.ls6 and .txt), current vs. voltage measurement files (.txt), optical microscopy images (.jpg)
Funders
Leverhulme Trust
Elemental Strategy Initiative
JSPS KAKENHI
MINECO
CREST
Grant Number
EPSRC: EP/N033906/1
Leverhulme Trust: RPG-2016-104
Leverhulme Trust: RF-2019-460
Elemental Strategy Initiative (MEXT): JPMXP0112101001
JSPS KAKENHI: JP20H00354
CREST: JPMJCR15F3
MINECO: FJC2018-036517-I
MINECO: RYC-2015-18539
Data collection method
Optical microscopy, Fluorescence microscopy, Atomic force microscopy, probe station current-voltage measurements.
Resource languages
English
Publisher
The University of Nottingham
Date Issued
September 15, 2020
Except where otherwise noted, this item's license is described as
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Fluorescence and Electroluminescence of J-Aggregated Polythiophene Monolayers on Hexagonal Boron Nitride.zip
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23.93 MB
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