Degradation
of Hole Transport Materials via Exciton-Driven Cyclization
Bruce
M. Bell
Michael B. Clark
David D. Devore
Timothy S. De Vries
Robert D. Froese
Kaitlyn C. Gray
David H. K. Jackson
T. F. Kuech
Hong-Yeop Na
Kenneth L. Kearns
Kyung-Joo Lee
Sukrit Mukhopadhyay
Aaron A. Rachford
Liam P. Spencer
W. H. Hunter Woodward
10.1021/acsami.7b00208.s001
https://acs.figshare.com/articles/journal_contribution/Degradation_of_Hole_Transport_Materials_via_Exciton-Driven_Cyclization/4823371
Organic light-emitting
diode (OLED) displays have been an active and intense area of research
for well over a decade and have now reached commercial success for
displays from cell phones to large format televisions. A more thorough
understanding of the many different potential degradation modes which
cause OLED device failure will be necessary to develop the next generation
of OLED materials, improve device lifetime, and to ultimately improve
the cost vs performance ratio. Each of the different organic layers
in an OLED device can be susceptible to unique decomposition pathways,
however stability toward excitons is critical for emissive layer (EML)
materials as well as any layer near the recombination zone. This study
will specifically focus on degradation modes within the hole transport
layer (HTL) with the goal being to identify the general decomposition
paths occurring in an operating device and use this information to
design new derivatives which can block these pathways. Through post-mortem
analyses of several aged OLED devices, an apparently common intramolecular
cyclization pathway has been identified that was not previously reported
for arylamine-containing HTL materials and that operates parallel
to but faster than the previously described fragmentation pathways.
2017-03-28 00:00:00
cause OLED device failure
EML
Hole Transport Materials
degradation modes
decomposition
intramolecular cyclization pathway
Exciton-Driven Cyclization Organic light-emitting diode
arylamine-containing HTL materials
hole transport layer
cost vs performance ratio
display