Organic Letters
Letter
Lee, S.; Kim, K.; Lee, Y.; Kwon, S.; Kim, J.; Kim, Y. Chem. Commun.
2013, 49, 4664.
core derivative. These increased lifetimes resulted from their
high current efficiencies and excellent thermal stabilities.
In this study, a new approach for forming fused-core
structures was introduced: compounds using the 4 and 9
positions of pyrene were synthesized with derivatives having
PFF and PFC cores. In this way, new fused-core chromophores
were synthesized by using a pyrene core and fluorene or
carbazole groups. In addition, their optical and EL properties
were characterized: a large internal torsion angle in film,
especially for TP-PFF, led to a blue-shifted PLmax compared to
that of TP-4,9-P-TP, creating a blue chromophore with a 30 nm
narrower fwhm; also, the TP-PFF EL device showed a reduced
turn-on voltage, roughly 50% increase in current efficiency, and
4-fold increase in lifetime.
The new compounds showed excellent characteristics in the
field of blue light-emitting materials for OLEDs. Moreover, the
new approach can be used to design and synthesize new fused
aromatic systems, based on combining chromophores other
than pyrene, such as anthracene, phenanthrene, and chrysene,
and hence find use in other applications such as OTFT and
OPV. Introduction of diverse side groups can also produce
many new organic functional materials and should result in the
development of organic materials with outstanding character-
istics in the future.
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ASSOCIATED CONTENT
* Supporting Information
The Supporting Information is available free of charge on the
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S
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Synthetic and experimental procedures, NMR, energy
diagrams, EL spectra, and additional references (PDF)
AUTHOR INFORMATION
Corresponding Author
■
Notes
The authors declare no competing financial interest.
(14) (a) Pratap, R.; Tominaga, Y.; Lee, M. L.; Castle, R. N. J.
ACKNOWLEDGMENTS
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Heterocycl. Chem. 1981, 18, 973. (b) Blatter, K.; Schluter, A. D.
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This research was supported by a grant from the Fundamental
R&D Program for Core Technology of Materials funded by the
Ministry of Trade, Industry and Energy, Republic of Korea
(Project No. 10050215).
Synthesis 1989, 1989, 356.
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