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Luminescent Properties of a Water‐Soluble Conjugated Polymer Incorporating Graphene‐Oxide Quantum Dots
Author(s) -
Li Penglei,
Di Stasio Francesco,
Eda Goki,
Fenwick Oliver,
McDonnell Shane O.,
Anderson Harry L.,
Chhowalla Manish,
Cacialli Franco
Publication year - 2015
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201402744
Subject(s) - graphene , photoluminescence , materials science , quantum dot , oxide , luminescence , polymer , quenching (fluorescence) , light emitting diode , conjugated system , nanotechnology , optoelectronics , photochemistry , chemical engineering , fluorescence , chemistry , composite material , optics , physics , metallurgy , engineering
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.