Recent Advances in Narrow Emission Bandwidth Materials for Application in Organic Light‐Emitting Diodes
Advanced Optical Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Фев. 21, 2025
Abstract
The
preparation
of
narrow
emission
bandwidth
materials
is
crucial
for
the
development
advanced
organic
light‐emitting
diodes
(OLEDs).
In
this
review
article,
state‐of‐the‐art
methodologies
used
emitters
with
high
color
purity
are
summarized,
and
favorable
design
strategies
rationally
organized.
Currently
OLEDs
have
some
issues,
such
as
device
stabilization
that
must
be
resolved,
should
also
considered.
Given
recent
exponential
growth
in
number
types
narrowband
emissive
organometallic
complexes
exhibiting
multiple‐resonance
thermally
activated
delayed
fluorescence
metal‐to‐ligand
charge
transfer
characteristics,
there
an
urgent
need
to
establish
key
technology
descriptors
purity.
review,
developments
boron,
fused
indolocarbazole,
carbonyl,
phosphine
oxide,
exhibit
spectra
described,
future
directions
advance
performance
devices
suggested.
Язык: Английский
Efficient harvesting of triplet excitons via multiple fast TTA up-conversion and high-lying reverse intersystem crossing channels for efficient blue fluorescent organic light-emitting diodes
Chemical Science,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 1, 2025
A
high
efficiency
blue
OLED
with
fast
TTA
up-conversion
and
highly-lying
reverse
intersystem
crossing
channels
was
successfully
fabricated.
The
maximum
EQE
reached
11.4%
CIE
coordinates
of
(0.13,
0.11).
Язык: Английский
Metasurface‐Integrated Organic Light‐Emitting Diodes: Analysis of Spectral Effects on Theoretical and Experimental Performance
Laser & Photonics Review,
Год журнала:
2025,
Номер
unknown
Опубликована: Фев. 19, 2025
Abstract
Organic
light‐emitting
diodes
(OLEDs)
have
emerged
as
a
leading
display
technology
and
become
rapidly
embraced
in
commercial
applications.
In
this
paper,
we
explore
the
integration
of
metasurface
(MS)
designs
for
polarizer‐free
top‐emitting
OLEDs
(TOLEDs)
with
enhanced
absorption
ambient
light.
From
performance
evaluated
by
varying
geometrical
parameters
MS,
it
is
found
that
broadband
long
wavelength
range,
associated
localized
surface
plasmon
mode
can
be
tuned
adjusting
these
parameters.
Optimizing
effectively
localize
enhance
near‐fields
at
MS
edges,
thereby
reducing
reflectance
MS‐integrated
TOLEDs
(MI‐TOLEDs)
under
An
optimized
may
balance
reduced
minimal
emission
loss
from
TOLEDs.
Numerical
results
suggest
MI‐TOLEDs
improve
spectral
out‐coupled
light
intensity
overall
angular
enhancement
power
least
50%
45%,
respectively,
over
conventional
TOLED.
whole
visible
MI‐TOLED
shows
48%
lower
compared
to
TOLED,
which
confirmed
experimental
data
measured
optical
cavity.
Changes
encapsulation
thickness
influence
polariton
mode,
shifting
resonance
conditions
spectra
within
short
range.
Язык: Английский
Hot‐Exciton‐Involved Dual‐Channel Stepwise Energy Transfer Enabling Efficient and Stable Blue OLEDs with Narrow Emission and High Luminance
Advanced Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Март 27, 2025
Marching
toward
next-generation
ultrahigh-definition
and
high-resolution
displays,
the
development
of
high-performance
blue
organic
light-emitting
diodes
(OLEDs)
with
narrow
emission
high
luminance
is
essential
requires
conceptual
advancements
in
both
molecular
device
design.
Herein,
a
emitter
reported
that
exhibits
hot-exciton
aggregation-induced
characteristics,
use
it
as
sensitizer
proposed
triplet-triplet
annihilation
(TTA)-assisted
hot-exciton-sensitized
fluorescence
(HSF)
device,
abbreviated
THSF.
Results
show
through
dual-channel
stepwise
Förster
Dexter
energy
transfer
processes,
THSF
system
can
simultaneously
enhance
exciton
utilization,
accelerate
dynamics,
reduce
concentration
triplet
excitons.
The
smooth
management
excitons
makes
overall
performance
superior
to
control
TTA
HSF
devices.
Furthermore,
narrowband
(CIEx,y
=
0.13,
0.12)
OLED
achieved
using
two-unit
tandem
design,
providing
an
excellent
maximum
external
quantum
efficiency
18.3%,
record-high
L90%
(the
where
ƞext
drops
90%
its
peak
value)
≈20
000
cd
m-2,
long
half-lifetime
at
100
m-2
initial
≈13
256
h.
These
results
showcase
great
potential
strategy
realizing
efficient
stable
OLEDs
luminance.
Язык: Английский
Tunable Near‐White Light Emission From a Single‐Molecule via Strategic Utilization of Aldehyde‐Gemdiol Intrinsic Equilibrium
Advanced Functional Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Апрель 24, 2025
Abstract
White‐light
emitting
organic
materials
have
garnered
significant
attention
due
to
their
potential
applications
in
lighting
and
display
technologies.
Compared
systems
that
emit
distinct
colors
by
combining
multiple
molecules,
single‐molecule
white‐light
emission
offer
notable
advantages,
such
as
simple
preparation,
good
repeatability
stability.
In
this
study,
a
novel
fluorescent
molecule
(BTP‐CHO)
was
developed.
For
the
first
time,
near‐white
light
system
exploiting
internal
equilibrium
of
aldehyde‐gemdiol
water
BTP‐CHO
constructed.
exists
predominantly
aldehyde
form
DMSO
shows
green
fluorescence;
while
blue
fluorescence
because
water.
Polychromatic
photoluminescence
could
be
achieved
fine‐tuning
various
parameters,
including
excitation
wavelength
solvent
ratio.
Additionally,
we
synthesized
three
derivatives
for
further
investigating
universality
strategy
results
indicate
has
universality.
Finally,
successfully
applied
development
information
encryption
hydrogels.
This
work
provides
new
insights
into
design
emitters
broadens
scope
research
on
intrinsic
about
emitting.
Язык: Английский
Comprehensive Review on the Structural Diversity and Versatility of Multi-Resonance Fluorescence Emitters: Advance, Challenges, and Prospects toward OLEDs
Chemical Reviews,
Год журнала:
2025,
Номер
unknown
Опубликована: Май 9, 2025
Fluorescence
emitters
with
a
multiple-resonant
(MR)
effect
have
become
research
hotspot.
These
MR
mainly
consist
of
polycyclic
aromatic
hydrocarbons
boron/nitrogen,
nitrogen/carbonyl,
and
indolocarbazole
frameworks.
The
staggered
arrangement
the
highest
occupied
molecular
orbital
lowest
unoccupied
facilitates
MR,
resulting
in
smaller
internal
reorganization
energy
narrower
emission
bandwidth.
Optimal
charge
separation
suppresses
gap
between
singlet
triplet
excited
states,
favoring
thermally
activated
delayed
fluorescence
(TADF).
MR-TADF
materials,
due
to
color
purity
high
efficiency,
are
excellent
candidates
for
organic
light-emitting
diodes.
Nevertheless,
significant
challenges
remain;
particular,
limitation
imposed
by
alternated
core
configuration
hinders
their
diversity
versatility.
Most
existing
materials
concentrated
blue-green
range,
only
few
red
near-infrared
spectra.
This
review
provides
timely
comprehensive
screening
from
pioneering
work
present.
Our
goal
is
gain
understandings
structure-performance
relationship
both
basic
advanced
perspectives.
Special
emphasis
placed
on
exploring
correlations
chemical
structure,
photophysical
properties
electroluminescent
performance
depth
breadth
an
aim
promote
future
development
emitters.
Язык: Английский
Unveiling the Mechanics Behind Polyimide’s Friction-Greening Phenomenon
Polymers,
Год журнала:
2024,
Номер
16(23), С. 3253 - 3253
Опубликована: Ноя. 22, 2024
Polyimide
(PI)
has
been
widely
used
as
a
flexible
substrate
in
the
OLED
display
industry
to
achieve
folding
and
other
functions.
However,
it
unintended
side
effects,
such
friction-greening,
green
screen
phenomenon
caused
by
friction
after
prolonged
usage.
This
is
related
drifting
TFT
characteristics
charge
accumulating
PI
combination
with
high
efficiency
of
pixels.
In
this
study,
mechanism
influence
structure
on
friction-greening
was
investigated.
Increasing
process
temperature
from
350
°C
470
°C,
chain
segment
within
became
more
regularized.
Thus,
material
had
higher
conductivity
shallower
trap
energy
levels,
which
confirmed
X-ray
small
angle
scattering,
dielectric,
photoluminescence,
methods.
Under
discharge
conditions,
less
accumulated
PI,
thus
effectively
mitigating
threshold
voltage
drift
thin-film
transistor
(TFT).
These
results
will
contribute
further
optimization
development
materials.
Язык: Английский