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Charge carriers and triplets in OLED devices studied by electrically detected electron paramagnetic resonance
Author(s) -
Pawlik Thomas D.,
Kondakova Marina E.,
Giesen David J.,
Deaton Joseph C.,
Kondakov Denis Y.
Publication year - 2009
Publication title -
journal of the society for information display
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.578
H-Index - 52
eISSN - 1938-3657
pISSN - 1071-0922
DOI - 10.1889/jsid17.3.279
Subject(s) - oled , optoelectronics , materials science , electron paramagnetic resonance , exciton , charge carrier , diode , electron , resonance (particle physics) , recombination , spectroscopy , atomic physics , chemistry , nuclear magnetic resonance , physics , nanotechnology , condensed matter physics , biochemistry , layer (electronics) , quantum mechanics , gene
— Organic light‐emitting diodes (OLEDs) were investigated by an electron paramagnetic resonance (EPR) technique that uses the effective device conductance as the detection channel. This technique enables us to identify and study charge carriers and triplet excitons with high sensitivity. By using a series of model devices, it was demonstrated that this type of spectroscopy provides information regarding triplet energy transfer and the location of the recombination zone. The fundamental understanding about the extent of the recombination zone in various OLED architectures helps in the design of devices with improved performance.