Pyrene‐Based Blue Aggregation‐Induced Emission Luminogens: The Synergistic Effect of Through‐Space Conjugation for High Exciton Utilization Efficiency and Narrow‐Band and Blue OLEDs
Advanced Optical Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Апрель 26, 2025
Abstract
Achieving
outstanding
narrow‐band
emission
and
improving
the
triplet
exciton
utilization
efficiency
is
crucial
for
high
organic
light‐emitting
diodes
(OLEDs)
electroluminescence
(EL)
efficiency.
Herein,
novel
1,3‐asymmetrical
substituted
pyrene‐based
blue
“hot
exciton”
materials
with
aggregation‐induced
(AIE)
characteristics
are
synthesized,
utilizing
pyrene
ring's
staggered
energy
levels
high‐performance
OLEDs.
The
triphenylamine‐decorated
emitters
exhibited
narrow
full
width
at
half
maxima
(FWHM)
<
60
nm,
while
tetraphenylethylene‐decorated
compounds
displayed
a
higher
fluorescence
quantum
yield
but
broader
FWHM
in
film
state.
These
AIE
luminogens
(AIEgens)
show
good
EL
(>35.6%)
nondoped
OLED
devices.
Meanwhile,
both
pyrenes
further
utilized
as
an
emitter
layer
thermally
activated
delayed
(TADF)‐sensitized
OLEDs
great
performance.
Moreover,
TPE‐decorated
TPE‐
m
2Ph
demonstrated
maximum
brightness,
current
efficiency,
power
external
of
35230
cd
−2
,
42
A
−1
48
lm
W
14.9%,
respectively.
Язык: Английский
Pyrene-Based Triphenylamine Light-Harvesting Materials with Related Structure–Property Relationships
The Journal of Organic Chemistry,
Год журнала:
2025,
Номер
unknown
Опубликована: Май 11, 2025
In
this
study,
a
series
of
novel
pyrene-based
triphenylamine
(TPA)
and
its
derivatives
(4,4'-dimethoxytriphenylamine,
TPA-OMe)
were
synthesized
from
newly
developed
chemical
intermediate,
bromopyrene.
This
approach
provides
unique
opportunity
to
systematically
investigate
the
effects
substituent
number
position
on
their
photophysical
properties.
The
results
demonstrate
that
molar
absorption
coefficients
fluorescence
quantum
yields
these
pyrene
significantly
increase
with
TPA
or
TPA-OMe
units,
exhibiting
excellent
light-harvesting
antenna
characteristics.
introduction
units
at
1,6-positions
induces
blue
shift
in
while
having
minimal
impact
bands
solution.
Single-crystal
X-ray
diffraction
analysis
solid-state
spectroscopy
reveal
steric
hindrance
effect
groups
suppresses
complex
intramolecular
interactions,
thereby
preserving
properties
derivatives.
Furthermore,
concentration-dependent
time-resolved
spectra
provide
insights
into
molecular
aggregation
behavior
energy
transfer
processes.
findings
study
offer
new
strategy
for
designing
efficient
artificial
systems
lay
theoretical
foundation
applications
conversion.
Язык: Английский