Synergistic photoluminescence enhancement in conjugated polymer-di-ureasil organic-inorganic composites
authors Willis-Fox, N; Marques, AT; Arlt, J; Scherf, U; Carlos, LD; Burrows, HD; Evans, RC
nationality International
journal CHEMICAL SCIENCE
keywords LIGHT-EMITTING-DIODES; PHOTO-CROSS-LINKING; ENERGY-TRANSFER; QUANTUM YIELDS; ORGANIC/INORGANIC HYBRIDS; SEMICONDUCTING POLYMER; HIGHLY EFFICIENT; RECENT PROGRESS; SILICA MATRIX; SOLAR-CELLS
abstract Poly(fluorene) conjugated polyelectrolyte (CPE)-di-ureasil organic-inorganic composites have been prepared using a versatile sol-gel processing method, which enables selective localisation of the CPE within the di-ureasil matrix. Introduction of the CPE during the sol-gel reaction leads to a homogeneous distribution of the CPE throughout the di-ureasil, whereas a post-synthesis solvent permeation route leads to the formation of a confined layer of the CPE at the di-ureasil surface. The CPE and the di-ureasil both function as photoactive components, contributing directly to, and enhancing the optical properties of their composite material. The bright blue photoluminescence exhibited by CPE-di-ureasils is reminiscent of the parent CPE; however the distinct contribution of the di-ureasil to the steady-state emission profile is also apparent. This is accompanied by a dramatic increase in the photoluminescence quantum yield to >50%, which is a direct consequence of the synergy between the two components. Picosecond time-correlated single photon counting measurements reveal that the di-ureasil effectively isolates the CPE chains, leading to emissive trap sites which have a high radiative probability. Moreover, intimate mixing of the CPE and the di-ureasil, coupled with their strong spectral overlap, results in efficient excitation energy transfer from the di-ureasil to these emissive traps. Given the simple, solution-based fabrication method and the structural tunability of the two components, this approach presents an efficient route to highly desirable CPE-hybrid materials whose optoelectronic properties may be enhanced and tailored for a targeted application.
publisher ROYAL SOC CHEMISTRY
issn 2041-6520
year published 2015
volume 6
issue 12
beginning page 7227
ending page 7237
digital object identifier (doi) 10.1039/c5sc02409a
web of science category Chemistry, Multidisciplinary
subject category Chemistry
unique article identifier WOS:000365225300066
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journal analysis (jcr 2017):
journal impact factor 9.063
5 year journal impact factor 8.757
category normalized journal impact factor percentile 89.766
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