Advanced Optical Materials,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Feb. 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.
Advanced Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Oct. 15, 2024
Compared
with
the
classical
boron/nitrogen
(B/N)
doped
ones,
multiple-resonance
thermally
activated
delayed
fluorescence
(MR-TADF)
emitters
embedded
B-N
covalent
bond
behave
a
significantly
blue-shifted
narrowband
TADF,
and
thus
show
greater
potential
in
ultrapure
blue
organic
light-emitting
diodes
(OLEDs).
As
proof
of
concept,
herein
peripheral
substitution
engineering
is
demonstrated
based
on
such
B‒N
parent
core.
The
simple
approach
found
to
ensure
easy
synthesis
via
one-pot
lithium-free
borylation-annulation,
manipulate
excited
states
through
different
electronic
coupling
between
core
substituent,
introduce
steric
hindrance
minimize
unwanted
spectral
broadening.
Impressively,
OLEDs
are
realized
give
high
external
quantum
efficiency
20.3%
together
Commission
Internationale
de
l'Éclairage
coordinates
(0.152,
0.046).
performance
well
competent
those
B/N
MR-TADF
emitters,
clearly
highlighting
that
framework
novel
promising
paradigm
towards
efficient
BT.2020
standard.
Advanced Materials,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 23, 2025
Abstract
Herein,
a
parallel
“bifunctional
group”
modulation
method
is
proposed
to
achieve
controlled
of
the
emission
wavelength
and
full‐width
at
half‐maximum
(FWHM)
values.
As
result,
three
proof‐of‐concept
emitters,
namely
DBNDS‐TPh,
DBNDS‐DFPh,
DBNDS‐CNPh,
are
designed
synthesized,
with
first
functional
dibenzo[
b,d
]thiophene
unit
concurrently
reducing
bandgap
elevate
their
triplet
state
energy.
A
second
group
1
,
′:
3
′,
″‐
triphenyl
electron
acceptors
1,3‐difluorobenzene
benzonitrile
respectively,
deepen
HOMO
LUMO
levels.
Accordingly,
CIE
coordinates
DBNDS‐CNPh
(0.13,
0.77),
(0.14,
0.76)
in
dilute
toluene
solution.
This
marks
instance
achieving
y
value
0.77
solutions.
Significantly,
non‐sensitized
pure‐green
OLEDs
based
on
DBNDS‐TPh
DBNDS‐DFPh
demonstrate
peak
EQE
35.0%
34.5%,
corresponding
(0.18,
0.75),
(0.17,
doping
concentration
wt.%,
representing
green
OLED
reaching
0.76
bottom‐emitting
device
structure
as
reported
literature.
Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Dec. 17, 2024
Abstract
Due
to
higher
exciton
energy,
the
deep‐blue
organic
light‐emitting
diodes
(OLEDs)
are
most
challenging
among
trichromatic
emitters.
In
this
work,
three
novel
blue
emitters
with
multi‐resonance
(MR)
effects
reported
based
on
N
,
,5,9‐tetraphenyl‐5,9‐dihydro‐5,9‐diaza‐13b‐boranaphtho[3,2,1‐
de
]anthracen‐7‐amine
(PAB)
skeleton,
incorporating
fluorine
and
methyl
groups.
Compound
2FPAB
MePAB
exhibit
ultra‐pure
emission
peaks
at
436
448
nm
respectively.
The
device
achieves
a
maximum
external
quantum
efficiency
of
19.8%
an
ultralow
CIEy
value
0.046
full‐width‐at‐half‐maximum
(FWHM)
29
in
bottom
emitting
device.
Additionally,
peripheral
cladding
atoms
extends
conjugation
framework
slightly
enhances
electron
acceptance
character
boron
atom
ortho‐position.
This
leads
redshift
spectrum
enhanced
photoluminescence
yield
(PLQY)
up
93%
for
MePABF.
Furthermore,
potential
application
as
sensitizer
MePABF
is
examined
by
fabricating
TADF‐sensitized‐TADF
(TST)
results
show
significantly
reduced
roll‐off
improved
performance,
(EQE
max
)
25.1%
FWHM
nm.
Advanced Optical Materials,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 17, 2025
Abstract
Organoboron‐nitrogen‐carbonyl‐hybridized
(
h
‐BNCO)
frameworks
are
emerging
templates
for
developing
high‐performance
multiresonant
(MR)
emitters,
but
their
potentials
have
not
been
fully
explored.
In
this
study,
a
novel
red
MR
emitter,
namely,
‐BNCO‐3,
is
developed
by
decorating
two
diphenylamine
moieties
onto
‐BNCO
skeleton
‐BNCO‐2).
Compared
with
the
green
backbone,
‐BNCO‐3
achieves
substantial
emission
redshift
of
76
nm
while
retaining
narrow
full
width
at
half
maximum
(FWHM)
45
(0.16
eV)
in
toluene.
Moreover,
common
advantages
integrating
carbonyl
group
B/N‐based
systems,
e.g.,
significant
nπ
*
contribution
triplet
manifolds,
obvious
‐BNCO‐3.
Thus,
obtained
fast
reverse
intersystem
crossing
rate
k
RISC
)
over
10
5
s
−1
.
The
optimized
non‐sensitized
organic
light‐emitting
diode
(OLED)
based
on
achieved
an
external
quantum
efficiency
(EQE)
26.4%.
further
employing
phosphor
as
sensitizer,
‐BNCO‐3‐based
OLED
can
reach
impressive
EQE
38.0%,
which
among
best
results
MR‐OLEDs.
This
work
demonstrates
effectiveness
into
organoboron‐nitrogen‐based
peripheral
decorations
enhancing
,
offering
new
insights
emitters
systems.
Journal of the American Chemical Society,
Journal Year:
2025,
Volume and Issue:
unknown
Published: March 7, 2025
We
report
the
synthesis
of
5-bora-21,22-dioxaporphyrin
5
and
its
main-group
d-block
metal
complexes
6
7,
respectively.
These
macrocyclic
boranes
constitute
first
examples
neutral
porphyrins
with
boron
in
a
meso-position
that
exhibit
global
aromaticity.
This
is
evidenced
by
spectroscopic
structural
features
as
well
calculated
nucleus
independent
chemical
shifts
(NICS)
anisotropic
induced
current
densities
(ACID).
The
boraporphyrins
absorb
light
strongly
red
spectral
region
(Q
bands)
show
enhanced
fluorescence
higher
quantum
yields
(5:
29%)
compared
to
conventional
porphyrins.
DFT
calculations
reveal
incorporation
borane
moiety
has
distinct
impact
on
frontier
orbital
energies,
thus
leading
altered
electrochemical
optical
properties.
Chemical Science,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 1, 2025
A
methyl-modification
strategy
is
proposed
to
enhance
the
ICT
and
RISC
processes
of
ultra-deep-blue
through-space
charge
transfer
emitters.
The
prepared
emitter
3MeCz-BO
achieves
a
high
EQE
max
10.1%
with
CIE
coordinates
(0.151,
0.051).
Small,
Journal Year:
2025,
Volume and Issue:
unknown
Published: March 10, 2025
Synthetic
methodology
is
a
fundamental
framework
for
preparing
functional
materials,
significantly
advancing
their
development.
Herein,
novel
6π
electrocyclization
reaction
unexpectedly
discovered
that
promotes
further
ring
closure
in
materials
derived
from
multi-resonance
thermally
activated
delayed
fluorescence
(MR-TADF)
compounds,
known
narrow
emission.
By
simply
raising
the
temperature,
this
process
red-shifts
emission
peak
of
target
material
while
effectively
narrowing
its
emissive
width
and
greatly
enhancing
optoelectronic
performance.
Utilizing
method,
newly
synthesized
MR-TADF
substrate
GCz-4B2
successfully
converted
into
compound
GCz-4B1.
Compared
to
GCz-4B2,
GCz-4B1
exhibited
redshift
26
nm
concurrently
achieving
significant
reduction
full
at
half-maximum
(FWHM)
value
corresponding
shoulder
intensity.
Notably,
photoluminescence
quantum
yield
(PLQY)
reached
95.1%,
compared
only
85.6%
GCz-4B2.
This
enhancement
can
be
attributed
increased
rigidity
reaction,
which
reduced
unfavorable
vibrational
relaxation
processes
improved
PLQY
values.
Furthermore,
OLEDs
based
on
attained
maximum
external
efficiency
(EQEmax)
28.0%,
with
small
FWHM
19.4
nm,
surpassing
devices
