Angewandte Chemie,
Год журнала:
2024,
Номер
unknown
Опубликована: Дек. 3, 2024
Abstract
Achieving
high
efficiency
narrowband
near‐ultraviolet
(NUV)
emitters
in
organic
light
emitting
diode
(OLED)
is
still
a
formidable
challenge.
Herein,
proof‐of‐concept
hybridized
local
and
charge
transfer
(HLCT)
molecule,
named
ICz‐BO,
prepared
characterized,
which
both
multiresonant
(MR)
skeletons
are
integrated
via
conjugation
connection.
A
slightly
distorted
structure
weak
intramolecular
(CT)
interaction
between
two
MR
subunits
lead
to
high‐lying
reverse
intersystem
crossing
(h‐RISC)
channel
of
T
6
→
S
1
,
also
evidenced
by
experimental
calculated
results.
Impressively,
the
ICz‐BO
emitter
exhibits
outstanding
NUV
emission
at
404
nm
with
full‐width
half
maximum
28
toluene
solution.
The
solution
processable
OLED
shows
an
excellent
device
performance
recorded
external
quantum
12.01
%,
concomitant
extremely
low
y‐axis
Commission
Internationale
de
l’Éclairage
(CIE
y
)
value
0.031.
To
best
our
knowledge,
this
highest
reported
for
HLCT‐based
NUV‐OLEDs
date.
This
research
proves
that
skeleton
plays
positive
effect
on
hot
exciton
emitter,
provides
alternative
paradigm
developing
high‐efficiency
emitters.
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.
Angewandte Chemie International Edition,
Год журнала:
2024,
Номер
unknown
Опубликована: Дек. 3, 2024
Abstract
Achieving
high
efficiency
narrowband
near‐ultraviolet
(NUV)
emitters
in
organic
light
emitting
diode
(OLED)
is
still
a
formidable
challenge.
Herein,
proof‐of‐concept
hybridized
local
and
charge
transfer
(HLCT)
molecule,
named
ICz‐BO,
prepared
characterized,
which
both
multiresonant
(MR)
skeletons
are
integrated
via
conjugation
connection.
A
slightly
distorted
structure
weak
intramolecular
(CT)
interaction
between
two
MR
subunits
lead
to
high‐lying
reverse
intersystem
crossing
(h‐RISC)
channel
of
T
6
→
S
1
,
also
evidenced
by
experimental
calculated
results.
Impressively,
the
ICz‐BO
emitter
exhibits
outstanding
NUV
emission
at
404
nm
with
full‐width
half
maximum
28
toluene
solution.
The
solution
processable
OLED
shows
an
excellent
device
performance
recorded
external
quantum
12.01
%,
concomitant
extremely
low
y‐axis
Commission
Internationale
de
l’Éclairage
(CIE
y
)
value
0.031.
To
best
our
knowledge,
this
highest
reported
for
HLCT‐based
NUV‐OLEDs
date.
This
research
proves
that
skeleton
plays
positive
effect
on
hot
exciton
emitter,
provides
alternative
paradigm
developing
high‐efficiency
emitters.
Utilizing
[14]dehydrobenzoannulene
as
an
electron
acceptor,
four
twisted
donor-acceptor
architectures
were
divergently
synthesized.
Intriguingly,
the
antiaromatic
diazocine
core
could
interrupt
transfer
in
π-frameworks.
Benefiting
from
junction
of
dehydrobenzoannulene
and
carbazoles,
all
displayed
stunning
fluorescence
electrochemiluminescence.
Anomalously,
blue-shifted
was
observed
electron-donating-group-substituted
homologues.
Finally,
a
molecular
carbon-based
sensor
for
dopamine
detection
constructed.
This
work
provides
new
insights
into
construction
application
carbons.
Materials,
Год журнала:
2025,
Номер
18(9), С. 2058 - 2058
Опубликована: Апрель 30, 2025
Two
innovative
dimeric
derivatives
of
indolo[3,2,1-jk]carbazole
(ICz),
named
7,7'-biindolo[3,2,1-jk]carbazole
(ICzDO)
and
4,4'-biindolo[3,2,1-jk]carbazole
(ICzDM),
have
been
developed.
Both
dimers
consist
two
ICz
units
coupled
through
distinct
ortho
meta
positions.
In
the
solution
state,
ICzDO
ICzDM
exhibited
photoluminescence
(PL)
maxima
at
379
nm
391
nm,
demonstrating
emission
in
deep-blue
region.
These
compounds
show
exceptionally
narrow
spectra,
characterized
by
full
width
half
maximum
(FWHM)
28
for
26
ICzDM.
film
a
428
whereas
showed
red-shifted
507
with
broad
87
indicating
significant
excimer
characteristics.
This
is
attributed
to
its
aggregation-enhanced
(AEEE)
When
used
as
host
materials
red
phosphorescent
OLEDs,
both
enabled
efficient
energy
transfer.
Devices
using
attained
highly
external
quantum
efficiency
(EQE)
values
13.5%,
remarkable
color
purity
represented
Commission
Internationale
de
l'Éclairage
(CIE)
coordinates
(0.685,
0.314).
findings
emphasize
how
strategic
variations
linking
positions
identical
chromophores
can
markedly
enhance
OLED
device
performance,
paving
way
material
designs
next-generation
organic
semiconductor
technologies.
Chemistry - An Asian Journal,
Год журнала:
2025,
Номер
unknown
Опубликована: Май 1, 2025
The
development
of
organic
light-emitting
diodes
(OLEDs)
has
witnessed
remarkable
progress
in
material
design
and
device
architecture.
Recent
advancements,
particularly
the
fourth
generation
OLEDs,
have
introduced
groundbreaking
innovations
such
as
hyperfluorescence
multiresonance
(MR)
thermally
activated
delayed
fluorescence
(MRTADF)
emitters.
Carbazole
emerged
a
versatile
scaffold,
playing
pivotal
role
conventional
fluorescence,
TADF,
roomtemperature
phosphorescence
(RTP),
MRTADF
systems.
In
recent
years,
fused
carbazole
derivatives
gained
significant
attention
both
emitting
host
materials
OLEDs.
fusion
units
enhances
molecular
rigidity
extends
πconjugation,
enabling
precise
tuning
optoelectronic
properties
across
wide
color
gamut,
including
blue,
green,
orange,
yellow,
red
emissions.
This
review
systematically
explores
application
various
systems
indolocarbazole,
thienocarbazole,
furocarbazole,
indenocarbazole,
triazatruxene,
acridinecarbazole,
chromenocarbazole,
pyrenocarbazole,
helicene
carbazole,
carbazolefused
boron/carbonyl
emitters
discussion
is
organized
into
three
sections
based
on
their
providing
comprehensive
understanding
structure-property
relationships.
Additionally,
other
color-emitting
OLEDs
are
discussed
where
relevant,
offering
holistic
perspective
potential
next-generation
OLED
technologies.
