mz6b00491_si_001.pdf (892.59 kB)
Highly Emissive Excimers by 2D Compression of Conjugated Polymers
journal contribution
posted on 2016-07-08, 11:51 authored by Byungjin Koo, Timothy M. SwagerInteractions between π-conjugated
polymers are known to create
ground-state aggregates, excimers, and exciplexes. With few exceptions,
these species exhibit decreased fluorescence quantum yields relative
to the isolated polymers in liquid or solid solutions. Herein, we
report a method to assemble emissive conjugated polymer excimers and
demonstrate their applicability in the detection of selected solvent
vapors. Specifically, poly(phenylene ethynylene)s (PPEs) with amphiphilic
side chains are organized in a Langmuir monolayer at the air–water
interface. Compression of the monolayer results in the reversible
conversion from a face-on organization of the π-system relative
to the water to what appears to be an incline-stack conformation.
The incline-stack organization creates a bright yellow emissive excimeric
state with increases of 28% in relative fluorescence quantum yields
to the face-on monolayer conformation. Multilayers can be transferred
onto the glass substrate via a Langmuir–Blodgett method with
preservation of the excimer emission. These films are metastable and
the fluorescence reverts to a cyan color similar to the spectra obtained
in solution and spin-cast films after exposure to selected solvent
vapors. This behavior has practical utility as a fluorescence-based
indicator for selected volatile organic compounds.
History
Usage metrics
Categories
Keywords
cyan colorspin-cast filmsEmissive Excimersexcimer emissionemissive excimeric statesolution2 D Compressionglass substrateLangmuir monolayermethodface-on organizationincline-stack conformationspecies exhibitface-on monolayer conformationground-state aggregatesConjugated Polymers Interactionsfluorescence-based indicatorpolymer excimersfluorescence quantum yieldsamphiphilic side chainsπ- systemPPEincline-stack organizationmonolayer resultsvapor
Licence
Exports
RefWorks
BibTeX
Ref. manager
Endnote
DataCite
NLM
DC