Interchain photoluminescence in substituted polyfluorenes

M Theander; DM Johansson; A Ruseckas; D Zigmantas; MR Andersson; null Sundstrom; O Inganas

Interchain photoluminescence in substituted polyfluorenes

M Theander^*, DM Johansson, A Ruseckas, D Zigmantas, MR Andersson, Sundstrom, O Inganas

^*Corresponding author for this work

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract

We have characterised the interchain emitting states of two substituted polyfluorenes with steady-state and time-resolved photoluminescence (PL). Site selective excitation of the interchain state shows that physical dimers are formed in the film. These dimers have low concentration in the films but exciton diffusion to the dimers is reducing the intrachain exciton lifetime. With asymmetrical substituents, the PL quantum yield is higher and the PL lifetime is longer due to lower concentration of dimers. Slow cooling from the melt, gives a new red shifted emission band and less intrachain emission. A discrepancy in the calculated radiative lifetimes suggest a fast formation of this new band.

Original language	English
Pages (from-to)	615-616
Number of pages	2
Journal	Synthetic Metals
Volume	119
Issue number	1-3
Publication status	Published - 15 Mar 2001
Event	16th International Conference on Science and Technology of Synthetic Metals (ICSM 2000) - GASTEIN, Austria Duration: 15 Jul 2000 → 21 Jul 2000

Keywords

polyfluorenes and derivatives
UV-Vis-Nir absorption
photoluminescence
time-resolved fast spectroscopy

Cite this

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title = "Interchain photoluminescence in substituted polyfluorenes",

abstract = "We have characterised the interchain emitting states of two substituted polyfluorenes with steady-state and time-resolved photoluminescence (PL). Site selective excitation of the interchain state shows that physical dimers are formed in the film. These dimers have low concentration in the films but exciton diffusion to the dimers is reducing the intrachain exciton lifetime. With asymmetrical substituents, the PL quantum yield is higher and the PL lifetime is longer due to lower concentration of dimers. Slow cooling from the melt, gives a new red shifted emission band and less intrachain emission. A discrepancy in the calculated radiative lifetimes suggest a fast formation of this new band.",

keywords = "polyfluorenes and derivatives, UV-Vis-Nir absorption, photoluminescence, time-resolved fast spectroscopy",

author = "M Theander and DM Johansson and A Ruseckas and D Zigmantas and MR Andersson and Sundstrom and O Inganas",

year = "2001",

month = mar,

day = "15",

language = "English",

volume = "119",

pages = "615--616",

journal = "Synthetic Metals",

issn = "0379-6779",

publisher = "ELSEVIER SCIENCE SA",

number = "1-3",

note = "16th International Conference on Science and Technology of Synthetic Metals (ICSM 2000) ; Conference date: 15-07-2000 Through 21-07-2000",

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TY - JOUR

T1 - Interchain photoluminescence in substituted polyfluorenes

AU - Theander, M

AU - Johansson, DM

AU - Ruseckas, A

AU - Zigmantas, D

AU - Andersson, MR

AU - Sundstrom, null

AU - Inganas, O

PY - 2001/3/15

Y1 - 2001/3/15

N2 - We have characterised the interchain emitting states of two substituted polyfluorenes with steady-state and time-resolved photoluminescence (PL). Site selective excitation of the interchain state shows that physical dimers are formed in the film. These dimers have low concentration in the films but exciton diffusion to the dimers is reducing the intrachain exciton lifetime. With asymmetrical substituents, the PL quantum yield is higher and the PL lifetime is longer due to lower concentration of dimers. Slow cooling from the melt, gives a new red shifted emission band and less intrachain emission. A discrepancy in the calculated radiative lifetimes suggest a fast formation of this new band.

AB - We have characterised the interchain emitting states of two substituted polyfluorenes with steady-state and time-resolved photoluminescence (PL). Site selective excitation of the interchain state shows that physical dimers are formed in the film. These dimers have low concentration in the films but exciton diffusion to the dimers is reducing the intrachain exciton lifetime. With asymmetrical substituents, the PL quantum yield is higher and the PL lifetime is longer due to lower concentration of dimers. Slow cooling from the melt, gives a new red shifted emission band and less intrachain emission. A discrepancy in the calculated radiative lifetimes suggest a fast formation of this new band.

KW - polyfluorenes and derivatives

KW - UV-Vis-Nir absorption

KW - photoluminescence

KW - time-resolved fast spectroscopy

M3 - Article

SN - 0379-6779

VL - 119

SP - 615

EP - 616

JO - Synthetic Metals

JF - Synthetic Metals

IS - 1-3

T2 - 16th International Conference on Science and Technology of Synthetic Metals (ICSM 2000)

Y2 - 15 July 2000 through 21 July 2000

ER -

Interchain photoluminescence in substituted polyfluorenes

Abstract

Keywords

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