Delayed Fluorescence (DF) and Photoluminescence (PL)-Detected Magnetic Resonance (PLDMR) Studies of Triplet-Triplet (T-T) Annihilation and Other Long-Lived Processes in π-Conjugated Polymers

Recent studies of frequency resolved DF due to T-T annihilation to singlet excitons ( 1 S*) in π-conjugated polymers are reviewed, and the significance of this process is compared to that of other long-lived processses affecting the PL, in particular the nonradiative quenching of 1 S* by polarons or...

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Bibliographic Details
Published in:Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals Molecular crystals and liquid crystals, 2001-05, Vol.361 (1), p.1-6
Main Authors: Shinar, Joseph, Partee, Jonathan, List, Emil J. W., Uhlhorn, Brian L., Kim, Chang-Hwan, Graupner, Wilhelm, Leising, Günther
Format: Article
Language:English
Subjects:
Applied sciences
delayed fluorescence
Electrical, magnetic and optical properties
Exact sciences and technology
Organic polymers
photoluminescence
Physicochemistry of polymers
PLDMR
polarons
Properties and characterization
singlet excitons
triplet excitons
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Summary:Recent studies of frequency resolved DF due to T-T annihilation to singlet excitons ( 1 S*) in π-conjugated polymers are reviewed, and the significance of this process is compared to that of other long-lived processses affecting the PL, in particular the nonradiative quenching of 1 S* by polarons or triplet excitons. While the DF studies suggest that T-T annihilation typically accounts for up to ∼3% of the total PL, PLDMR and other studies suggest that singlet quenching by polarons and triplets may be a very significant process in the films and organic light emitting devices (OLEDs), especially at high excitation densities.
ISSN:1058-725X
DOI:10.1080/10587250108025709