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41.3: Charge Carriers And Triplets In OLED Devices Studied by Electrically Detected Magnetic Resonance
Author(s) -
Awlik Thomas D.,
Ondakova Marina E.,
Giesen David J.,
Deaton Joseph C.,
Kondakov Denis Y.
Publication year - 2008
Publication title -
sid symposium digest of technical papers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 44
eISSN - 2168-0159
pISSN - 0097-966X
DOI - 10.1889/1.3069737
Subject(s) - oled , optoelectronics , exciton , charge carrier , electron paramagnetic resonance , materials science , diode , resonance (particle physics) , sensitivity (control systems) , atomic physics , nuclear magnetic resonance , physics , electronic engineering , nanotechnology , condensed matter physics , layer (electronics) , engineering
Organic Light‐Emitting Diodes (OLEDs) were investigated with 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. Using a series of model devices, we demonstrate that this type of spectroscopy provides information about 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 us to design devices with improved performance.