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Photophysics of charge-transfer excitons in thin films of pi-conjugated polymers

DSpace at IIT Bombay

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Title Photophysics of charge-transfer excitons in thin films of pi-conjugated polymers
 
Creator WANG, ZD
MAZUMDAR, S
SHUKLA, A
 
Subject interchain interactions
poly(p-phenylene vinylene)
absorption
photoluminescence
emission
states
electroabsorption
photoexcitations
spectroscopy
generation
excited states
excitons
high-speed optical techniques
polymer films
 
Description We develop a theory of the electronic structure and photophysics of interacting chains of pi-conjugated polymers to understand the differences between solutions and films. While photoexcitation generates only the intrachain exciton in solutions, the optical exciton as well as weakly allowed charge-transfer excitons are generated in films. We extend existing theories of the lowest polaron pair and charge-transfer excitons to obtain descriptions of the excited states of these interchain species, and we show that a significant fraction of ultrafast photoinduced absorptions in films originates from the lowest charge-transfer exciton. Our proposed mechanism explains the simultaneous observation of polaronlike-induced absorption features peculiar to films in ultrafast spectroscopy and the absence of mobile charge carriers as deduced from other experiments. We also show that there is a 1:1 correspondence between the essential states that describe the photophysics of single chains and of interacting chains that constitute thin films.
 
Publisher AMER PHYSICAL SOC
 
Date 2011-07-16T22:53:33Z
2011-12-26T12:49:59Z
2011-12-27T05:35:53Z
2011-07-16T22:53:33Z
2011-12-26T12:49:59Z
2011-12-27T05:35:53Z
2008
 
Type Article
 
Identifier PHYSICAL REVIEW B, 78(23), -
1098-0121
http://dx.doi.org/10.1103/PhysRevB.78.235109
http://dspace.library.iitb.ac.in/xmlui/handle/10054/4551
http://hdl.handle.net/10054/4551
 
Language en