Electron-exchange-assisted photon energy up-conversion in thin films of π-conjugated polymeric composites

Panagiotis E. Keivanidis; Frédéric Laquai; Joseph W.F. Robertson; Stanislav Baluschev; Josemon Jacob; Klaus Müllen; Gerhard Wegner

doi:10.1021/jz2007462

Electron-exchange-assisted photon energy up-conversion in thin films of π-conjugated polymeric composites

Panagiotis E. Keivanidis^*, Frédéric Laquai, Joseph W.F. Robertson, Stanislav Baluschev, Josemon Jacob, Klaus Müllen, Gerhard Wegner

^*Corresponding author for this work

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

25 Scopus citations

Abstract

The mechanism of triplet-triplet annihilation (TTA)-induced up-converted (UC) delayed luminescence is studied in two different binary organic systems consisting of platinum(II) octaethyl porphyrin (PtOEP) mixed with either poly(fluorene) (PF26) or ladder-type pentaphenylene (L5Ph). Cyclic voltammetry and differential pulse voltammetry are employed for estimating the ionization potentials of PtOEP and L5Ph. Delayed luminescence spectroscopy sets the energy of the lowest excited triplet state of L5Ph 0.20 eV higher than the triplet state of PtOEP (1.90 eV). The different phosphorescence PtOEP lifetime indicates differences in PtOEP aggregation in the polymer matrices. The presented results propose that the difference in the relative intensities of the delayed UC luminescence is determined by the difference between the ionization potentials of PtOEP and the polymer matrix. In the solid state, the electric-field-induced quenching of the delayed L5Ph UC luminescence suggests the formation of an intermediate charge-transfer state after the TTA within the PtOEP domains.

Original language	English (US)
Pages (from-to)	1893-1899
Number of pages	7
Journal	Journal of Physical Chemistry Letters
Volume	2
Issue number	15
DOIs	https://doi.org/10.1021/jz2007462
State	Published - Aug 4 2011
Externally published	Yes

Keywords

Kinetics
Spectroscopy

ASJC Scopus subject areas

General Materials Science
Physical and Theoretical Chemistry

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10.1021/jz2007462

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@article{723a97b8b2944af9a4a266cd7556f20a,

title = "Electron-exchange-assisted photon energy up-conversion in thin films of π-conjugated polymeric composites",

abstract = "The mechanism of triplet-triplet annihilation (TTA)-induced up-converted (UC) delayed luminescence is studied in two different binary organic systems consisting of platinum(II) octaethyl porphyrin (PtOEP) mixed with either poly(fluorene) (PF26) or ladder-type pentaphenylene (L5Ph). Cyclic voltammetry and differential pulse voltammetry are employed for estimating the ionization potentials of PtOEP and L5Ph. Delayed luminescence spectroscopy sets the energy of the lowest excited triplet state of L5Ph 0.20 eV higher than the triplet state of PtOEP (1.90 eV). The different phosphorescence PtOEP lifetime indicates differences in PtOEP aggregation in the polymer matrices. The presented results propose that the difference in the relative intensities of the delayed UC luminescence is determined by the difference between the ionization potentials of PtOEP and the polymer matrix. In the solid state, the electric-field-induced quenching of the delayed L5Ph UC luminescence suggests the formation of an intermediate charge-transfer state after the TTA within the PtOEP domains.",

keywords = "Kinetics, Spectroscopy",

author = "Keivanidis, {Panagiotis E.} and Fr{\'e}d{\'e}ric Laquai and Robertson, {Joseph W.F.} and Stanislav Baluschev and Josemon Jacob and Klaus M{\"u}llen and Gerhard Wegner",

year = "2011",

month = aug,

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doi = "10.1021/jz2007462",

language = "English (US)",

volume = "2",

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T1 - Electron-exchange-assisted photon energy up-conversion in thin films of π-conjugated polymeric composites

AU - Keivanidis, Panagiotis E.

AU - Laquai, Frédéric

AU - Robertson, Joseph W.F.

AU - Baluschev, Stanislav

AU - Jacob, Josemon

AU - Müllen, Klaus

AU - Wegner, Gerhard

PY - 2011/8/4

Y1 - 2011/8/4

N2 - The mechanism of triplet-triplet annihilation (TTA)-induced up-converted (UC) delayed luminescence is studied in two different binary organic systems consisting of platinum(II) octaethyl porphyrin (PtOEP) mixed with either poly(fluorene) (PF26) or ladder-type pentaphenylene (L5Ph). Cyclic voltammetry and differential pulse voltammetry are employed for estimating the ionization potentials of PtOEP and L5Ph. Delayed luminescence spectroscopy sets the energy of the lowest excited triplet state of L5Ph 0.20 eV higher than the triplet state of PtOEP (1.90 eV). The different phosphorescence PtOEP lifetime indicates differences in PtOEP aggregation in the polymer matrices. The presented results propose that the difference in the relative intensities of the delayed UC luminescence is determined by the difference between the ionization potentials of PtOEP and the polymer matrix. In the solid state, the electric-field-induced quenching of the delayed L5Ph UC luminescence suggests the formation of an intermediate charge-transfer state after the TTA within the PtOEP domains.

AB - The mechanism of triplet-triplet annihilation (TTA)-induced up-converted (UC) delayed luminescence is studied in two different binary organic systems consisting of platinum(II) octaethyl porphyrin (PtOEP) mixed with either poly(fluorene) (PF26) or ladder-type pentaphenylene (L5Ph). Cyclic voltammetry and differential pulse voltammetry are employed for estimating the ionization potentials of PtOEP and L5Ph. Delayed luminescence spectroscopy sets the energy of the lowest excited triplet state of L5Ph 0.20 eV higher than the triplet state of PtOEP (1.90 eV). The different phosphorescence PtOEP lifetime indicates differences in PtOEP aggregation in the polymer matrices. The presented results propose that the difference in the relative intensities of the delayed UC luminescence is determined by the difference between the ionization potentials of PtOEP and the polymer matrix. In the solid state, the electric-field-induced quenching of the delayed L5Ph UC luminescence suggests the formation of an intermediate charge-transfer state after the TTA within the PtOEP domains.

KW - Kinetics

KW - Spectroscopy

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U2 - 10.1021/jz2007462

DO - 10.1021/jz2007462

M3 - Article

AN - SCOPUS:79961232958

SN - 1948-7185

VL - 2

SP - 1893

EP - 1899

JO - Journal of Physical Chemistry Letters

JF - Journal of Physical Chemistry Letters

IS - 15

ER -

Electron-exchange-assisted photon energy up-conversion in thin films of π-conjugated polymeric composites

Abstract

Keywords

ASJC Scopus subject areas

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