Accumulation of electric-field-stabilized geminate polaron pairs in an organic semiconductor to attain high excitation density under low intensity pumping

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Abstract

The recombination dynamics of geminate polaron pair (PP) states are investigated by monitoring electric-field-induced delayed fluorescence in thin films consisting of the green laser dye, Coumarin-6 (C6) doped at 1 wt % into 4, 4′ -bis (N -carbazolyl)biphenyl. We find that the PP decay follows τ-m (with m∼0.1), where τ is the time that the PPs are held in the field. This sublinear decay suggests the possibility for accumulation of PPs over time that can then be reconverted into excitons upon field removal. We demonstrate the generation of short (∼50 ns full width at half maximum) bursts of C6 fluorescence with peak intensities >20 times the steady-state fluorescence intensity (corresponding to a C6 singlet exciton density NS >4× 1015 cm3) when pumped continuously by a low intensity (<1 W cm2) laser in the presence of a pulsed electric field.

Original languageEnglish (US)
Article number193502
JournalApplied Physics Letters
Volume89
Issue number19
DOIs
StatePublished - Nov 16 2006

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organic semiconductors
pumping
fluorescence
electric fields
excitons
excitation
decay
dye lasers
bursts
thin films
lasers

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

Cite this

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title = "Accumulation of electric-field-stabilized geminate polaron pairs in an organic semiconductor to attain high excitation density under low intensity pumping",
abstract = "The recombination dynamics of geminate polaron pair (PP) states are investigated by monitoring electric-field-induced delayed fluorescence in thin films consisting of the green laser dye, Coumarin-6 (C6) doped at 1 wt {\%} into 4, 4′ -bis (N -carbazolyl)biphenyl. We find that the PP decay follows τ-m (with m∼0.1), where τ is the time that the PPs are held in the field. This sublinear decay suggests the possibility for accumulation of PPs over time that can then be reconverted into excitons upon field removal. We demonstrate the generation of short (∼50 ns full width at half maximum) bursts of C6 fluorescence with peak intensities >20 times the steady-state fluorescence intensity (corresponding to a C6 singlet exciton density NS >4× 1015 cm3) when pumped continuously by a low intensity (<1 W cm2) laser in the presence of a pulsed electric field.",
author = "Giebink, {Noel Christopher} and Forrest, {S. R.}",
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language = "English (US)",
volume = "89",
journal = "Applied Physics Letters",
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T1 - Accumulation of electric-field-stabilized geminate polaron pairs in an organic semiconductor to attain high excitation density under low intensity pumping

AU - Giebink, Noel Christopher

AU - Forrest, S. R.

PY - 2006/11/16

Y1 - 2006/11/16

N2 - The recombination dynamics of geminate polaron pair (PP) states are investigated by monitoring electric-field-induced delayed fluorescence in thin films consisting of the green laser dye, Coumarin-6 (C6) doped at 1 wt % into 4, 4′ -bis (N -carbazolyl)biphenyl. We find that the PP decay follows τ-m (with m∼0.1), where τ is the time that the PPs are held in the field. This sublinear decay suggests the possibility for accumulation of PPs over time that can then be reconverted into excitons upon field removal. We demonstrate the generation of short (∼50 ns full width at half maximum) bursts of C6 fluorescence with peak intensities >20 times the steady-state fluorescence intensity (corresponding to a C6 singlet exciton density NS >4× 1015 cm3) when pumped continuously by a low intensity (<1 W cm2) laser in the presence of a pulsed electric field.

AB - The recombination dynamics of geminate polaron pair (PP) states are investigated by monitoring electric-field-induced delayed fluorescence in thin films consisting of the green laser dye, Coumarin-6 (C6) doped at 1 wt % into 4, 4′ -bis (N -carbazolyl)biphenyl. We find that the PP decay follows τ-m (with m∼0.1), where τ is the time that the PPs are held in the field. This sublinear decay suggests the possibility for accumulation of PPs over time that can then be reconverted into excitons upon field removal. We demonstrate the generation of short (∼50 ns full width at half maximum) bursts of C6 fluorescence with peak intensities >20 times the steady-state fluorescence intensity (corresponding to a C6 singlet exciton density NS >4× 1015 cm3) when pumped continuously by a low intensity (<1 W cm2) laser in the presence of a pulsed electric field.

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U2 - 10.1063/1.2385840

DO - 10.1063/1.2385840

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JO - Applied Physics Letters

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