Title
The role of triplet states in the emission mechanism of polymer light-emitting diodes
Abbreviated Journal Title
Epl
Keywords
ELECTROLUMINESCENCE; SPECTRA; FILMS; POLYFLUORENE; MOLECULES; BAND; Physics, Multidisciplinary
Abstract
The blue emission of polyfluorene (PF)-based light-emitting diodes (LEDs) is known to degrade due to a low-energy green emission, which hitherto has been attributed to oxidative defects. By studying the electroluminescence (EL) from ethyl-hexyl substituted PF LEDs in the presence of oxygen and in an inert atmosphere, and by using trace quantities of paramagnetic impurities (PM) in the polymer, we show that the triplet states play a major role in the low-energy emission mechanism. Our time-dependent many-body studies show a large cross-section for the triplet formation in the EL process in the presence of PM, primarily due to electron-hole recombination processes. Copyright (C) EPLA, 2009
Journal Title
Epl
Volume
87
Issue/Number
5
Publication Date
1-1-2009
Document Type
Article
Language
English
First Page
5
WOS Identifier
ISSN
0295-5075
Recommended Citation
"The role of triplet states in the emission mechanism of polymer light-emitting diodes" (2009). Faculty Bibliography 2000s. 1273.
https://stars.library.ucf.edu/facultybib2000/1273
Comments
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