title: Luminescent properties of a water-soluble conjugated polymer incorporating graphene-oxide quantum dots.
abstract: We report the incorporation of graphene-oxide quantum dots (GOQDs) into films, diluted solutions, and light-emitting diodes (LEDs) as part of a water-soluble derivative of poly(p-phenylene vinylene), or PDV.Li, to investigate their impact on the light-emission properties of this model conjugated polymer. Despite the well-known ability of graphene and graphene oxide to quench the photoluminescence of nearby emitters, we find that the addition of GOQDs to diluted solutions of PDV.Li does not significantly affect the photoluminescence (PL) dynamics of PDV.Li, bringing about only a modest quenching of the PL. However, loading the polymer with GOQDs led to a substantial decrease in the turn-on voltage of LEDs based on GOQD-PDV.Li composites. This effect can be attributed to either the improved morphology of the host polymer, resulting in an increase in the charge mobility, or the enhanced injection through GOQDs near the electrodes.
authors: London Centre for Nanotechnology and Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT (UK).
authors: Penglei
authors: P
authors: Li
authors: Francesco
authors: F
authors: Di Stasio
authors: Goki
authors: G
authors: Eda
authors: Oliver
authors: O
authors: Fenwick
authors: Shane O
authors: SO
authors: McDonnell
authors: Harry L
authors: HL
authors: Anderson
authors: Manish
authors: M
authors: Chhowalla
authors: Franco
authors: F
authors: Cacialli
keywords: LEDs; blends; graphene; photophysics; rotaxanes