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Title: Electron-exchange-assisted photon energy up-conversion in thin films of π-conjugated polymeric composites
Authors: Keivanidis, Panagiotis E. 
Laquai, Frédéric 
Robertson, Joseph W.F. 
Baluschev, Stanislav 
Jacob, Josemon 
Müllen, Klaus 
Wegner, Gerhard 
Major Field of Science: Engineering and Technology
Field Category: Electrical Engineering - Electronic Engineering - Information Engineering
Keywords: Kinetics;Spectroscopy
Issue Date: 4-Aug-2011
Source: The Journal of Physical Chemistry Letters, 2011, vol. 2, iss. 15, pp. 1893-1899
Volume: 2
Issue: 15
Start page: 1893
End page: 1899
Journal: The Journal of Physical Chemistry Letters 
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.
ISSN: 1948-7185
DOI: 10.1021/jz2007462
Rights: American Chemical Society
Type: Article
Affiliation : Max Planck Institute for Polymer Research 
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