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Issue 44, 2016
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Enhanced performance of blue polymer light-emitting diodes by incorporation of Ag nanoparticles through the ligand-exchange process

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Abstract

A coupling interaction between localised surface plasmon resonance of metal nanoparticles (NPs) and emitting materials has been shown to improve the internal quantum efficiency in organic light-emitting diodes. In this research, Ag NPs were introduced into blue polymer light-emitting diodes (PLEDs), which suffer from low efficiency. Ag NPs were attached to the indium tin oxide (ITO) surface through a ligand-exchange process, which guarantees well-dispersed Ag NPs, to maximise resonant coupling and to prevent optical and electrical side effects. Mercaptoacid molecules not only function as a coupling agent between ITO and Ag NPs, but also aid the transfer of holes by increasing the work function of ITO, as confirmed by tests on hole-only devices and by ultraviolet photoelectron spectroscopy. Maximum current efficiencies of blue PLEDs improved by 25% with thioglycolic acid (TGA) only and by 48% with 0.302 nM Ag NPs attached to TGA. We confirmed from time-resolved photoluminescence spectra and normalised electroluminescence spectra that the enhancement mechanism is the resonant interaction between Ag NPs and the blue light-emitting polymer, SPB-02T.

Graphical abstract: Enhanced performance of blue polymer light-emitting diodes by incorporation of Ag nanoparticles through the ligand-exchange process

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Publication details

The article was received on 05 Jul 2016, accepted on 22 Aug 2016 and first published on 24 Aug 2016


Article type: Paper
DOI: 10.1039/C6TC02812H
Citation: J. Mater. Chem. C, 2016,4, 10445-10452
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    Enhanced performance of blue polymer light-emitting diodes by incorporation of Ag nanoparticles through the ligand-exchange process

    Y. Y. Kim, W. J. Hyun, K. H. Park, Y. G. Lee, J. Lee and O. O. Park, J. Mater. Chem. C, 2016, 4, 10445
    DOI: 10.1039/C6TC02812H

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