Imperial College London

Professor Matthew J. Fuchter

Faculty of Natural SciencesDepartment of Chemistry

Professor of Chemistry
 
 
 
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Contact

 

+44 (0)20 7594 5815m.fuchter

 
 
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Location

 

401CMolecular Sciences Research HubWhite City Campus

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Summary

 

Publications

Citation

BibTex format

@article{Wan:10.1021/acsnano.9b02940,
author = {Wan, L and Wade, J and Salerno, F and Arteaga, O and Laidlaw, B and Wang, X and Penfold, T and Fuchter, MJ and Campbell, AJ},
doi = {10.1021/acsnano.9b02940},
journal = {ACS Nano},
title = {Inverting the handedness of circularly polarized luminescence from light-emitting polymers using film thickness},
url = {http://dx.doi.org/10.1021/acsnano.9b02940},
}

RIS format (EndNote, RefMan)

TY  - JOUR
AB - The emission of circularly polarized light is central to many applications, including data storage, optical quantum computation, biosensing, environmental monitoring, and display technologies. An emerging method to induce (chiral) circularly polarized (CP) electroluminescence from the active layer of polymer light-emitting diodes (polymer OLEDs; PLEDs) involves blending achiral polymers with chiral small-molecule additives, where the handedness/sign of the CP light is controlled by the absolute stereochemistry of the small molecule. Through the in-depth study of such a system we report an interesting chiroptical property: the ability to tune the sign of CP light as a function of active layer thickness for a fixed enantiomer of the chiral additive. We demonstrate that it is possible to achieve both efficient (4.0 cd/A) and bright (8000 cd/m2) CP-PLEDs, with high dissymmetry of emission of both left-handed (LH) and right-handed (RH) light, depending on thickness (thin films, 110 nm: gEL = 0.51, thick films, 160 nm: gEL = -1.05, with the terms "thick" and "thin" representing the upper and lower limits of the thickness regime studied), for the same additive enantiomer. We propose that this arises due to an interplay between localized CP emission originating from molecular chirality and CP light amplification or inversion through a chiral medium. We link morphological, spectroscopic, and electronic characterization in thin films and devices with theoretical studies in an effort to determine the factors that underpin these observations. Through the control of active layer thickness and device architecture, this study provides insights into the mechanisms that result in CP luminescence and high performance from CP-PLEDs, as well as demonstrating new opportunities in CP photonic device design.
AU - Wan,L
AU - Wade,J
AU - Salerno,F
AU - Arteaga,O
AU - Laidlaw,B
AU - Wang,X
AU - Penfold,T
AU - Fuchter,MJ
AU - Campbell,AJ
DO - 10.1021/acsnano.9b02940
SN - 1936-0851
TI - Inverting the handedness of circularly polarized luminescence from light-emitting polymers using film thickness
T2 - ACS Nano
UR - http://dx.doi.org/10.1021/acsnano.9b02940
UR - https://www.ncbi.nlm.nih.gov/pubmed/31241299
UR - http://hdl.handle.net/10044/1/71378
ER -