jp8b00777_si_001.pdf (1.5 MB)
Strategy Toward Tuning Emission of Star-Shaped Tetraphenylethene-Substituted Truxenes for Sky-Blue and Greenish-White Organic Light-Emitting Diodes
journal contribution
posted on 2018-06-14, 00:00 authored by Rekha Sharma, Dmytro Volyniuk, Charu Popli, Oleksandr Bezvikonnyi, Juozas V. Grazulevicius, Rajneesh MisraStar-shaped, C3-symmetric, tetraphenylethene (TPE) and 2,3,3-triphenylacrylonitrile
(TPAN)-substituted truxenes 7, 8, and 9 were designed and synthesized by the palladium-catalyzed
Suzuki and Sonogashira cross-coupling reactions. The TPE-substituted
truxenes 7 and 8 show aggregation-induced
emission behavior, whereas TPAN-substituted truxene 9 shows aggregation-caused quenching effect in tetrahydrofuran/water
medium due to the π–π stacking. The computational
calculation on truxenes 7–9 was performed, which
reveals that in truxene 9, the electron density transfers
from truxene to TPAN. The truxenes 7–9 showed
high thermal stability as the 10% weight loss temperature is more
than 400 °C. The ionization potentials close to 6.0 eV were estimated
for the solid samples of truxenes 7–9 by photoelectron
emission spectrometry. Solid samples of the studied truxenes exhibited
strong emission with high quantum yields (up to 47%). Electroluminescent
properties of truxene derivatives 7–9 were investigated
in solution-processed and vacuum-deposited organic light-emitting
diodes (OLEDs). Greenish-white nondoped OLEDs with maximum brightness
of 7000 cd/m2 and maximum external quantum efficiency of
3.8% were fabricated using truxene-cored compound 7 as
the fluorescent emitter.
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TPAN-substituted truxene 9photoelectron emission spectrometry8 show aggregation-induced emission behaviorlight-emitting diodes6.0 eVtruxene-cored compound 7Greenish-white nondoped OLEDspalladium-catalyzed SuzukiStar-Shaped Tetraphenylethene-Substituted Truxenesquantum efficiencyquantum yieldsTuning Emissionaggregation-caused quenching effectSonogashira cross-coupling reactionselectron density transfersC 3Greenish-White Organic Light-Emitting Diodes Star-shapedSolid samplesionization potentialsTPE-substituted truxenes 7truxene 9
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