Angewandte Chemie,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Dec. 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.
Inorganic Chemistry,
Journal Year:
2024,
Volume and Issue:
63(38), P. 17435 - 17448
Published: Sept. 4, 2024
The
photophysical
properties
and
luminescent
mechanism
of
a
series
tripod-type
Cu(I)
complexes
in
solution
solids
were
comprehensively
investigated
through
theoretical
simulations.
From
microscopic
perspective,
the
experimental
phenomenon
is
explained:
(1)
intrinsic
reason
for
quenching
complex
Advanced Optical Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Sept. 9, 2024
Abstract
Multiple
resonance
thermally
activated
delayed
fluorescence
(MR‐TADF)
emitters
are
promising
for
high‐definition
organic
light‐emitting
diodes
(OLEDs)
due
to
their
high
exciton
utilization
and
color
purity.
However,
strong
interchromophore
interactions
cause
most
MR‐TADF
with
planar
structures
aggregate
at
doping
concentrations,
leading
degraded
efficiencies.
Herein,
using
benzenesulfonyl‐functionalized
dibenzothiophene
sulfoximine
steric
effects,
three
(2SBN,
3SBN,
4SBN)
synthesized
by
coupling
the
classic
DtBuCzB
skeleton
different
sites.
Three
exhibit
green
or
blue‐green
emission
full
width
half
maximum
(FWHM)
values
less
than
29
nm
photoluminescence
quantum
yields
exceeding
90%.
OLEDs
based
on
2SBN,
4SBN
achieve
external
efficiency
(EQE
max
)
of
30.1%,
27%,
33.8%,
respectively,
a
5
wt.%
concentration.
Notably,
distorted
conformation
suppressed
intermolecular
interaction,
OLED
remains
EQE
28.9%
concentration
20
wt.%.
These
results
demonstrate
feasibility
molecular
design
modulate
spatial
conformations
via
positional
isomerism
develop
reduced
quenching.
Angewandte Chemie,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Oct. 19, 2024
Abstract
The
π‐conjugated
macrocyclic
emitters
with
thermally
activated
delayed
fluorescence
(TADF)
characteristics
have
attracted
widespread
attention
in
the
field
of
organic
electroluminescence
(EL)
materials
due
to
their
unique
geometries
and
excellent
luminescence
performance.
Despite
significant
impact
conjugation
length
cavity
dimensions
on
molecular
conformation,
influence
these
factors
excited‐state
properties
remains
understudied.
Herein,
we
formulated
a
strategy
aimed
at
modulating
conformation
TADF
molecules
containing
aniline
as
donor
(D)
unit,
triazine
acceptor
(A),
linked
D−A
D‐π‐A
alternative
construction
(
MC‐TNT
MC‐TST
).
Corroborated
by
experimental
theoretical
analyses,
compact
conformationally
twisted
exhibits
efficient
blue
crystalline
state,
facilitating
EL
high
doping
concentrations
maximum
external
quantum
efficiency
(EQE
max
)
13.9
%,
leading
emitters.
Notably,
π‐bridge
flat
demonstrates
diminished
Coulombic
repulsion,
achieving
nearly
100
%
photoluminescence
yield
superior
horizontal
dipole
orientation
85
5
wt
doped
films,
corresponding
device‘s
EQE
reaches
record‐high
32.7
within
domain.
Angewandte Chemie International Edition,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Oct. 19, 2024
Abstract
The
π‐conjugated
macrocyclic
emitters
with
thermally
activated
delayed
fluorescence
(TADF)
characteristics
have
attracted
widespread
attention
in
the
field
of
organic
electroluminescence
(EL)
materials
due
to
their
unique
geometries
and
excellent
luminescence
performance.
Despite
significant
impact
conjugation
length
cavity
dimensions
on
molecular
conformation,
influence
these
factors
excited‐state
properties
remains
understudied.
Herein,
we
formulated
a
strategy
aimed
at
modulating
conformation
TADF
molecules
containing
aniline
as
donor
(D)
unit,
triazine
acceptor
(A),
linked
D−A
D‐π‐A
alternative
construction
(
MC‐TNT
MC‐TST
).
Corroborated
by
experimental
theoretical
analyses,
compact
conformationally
twisted
exhibits
efficient
blue
crystalline
state,
facilitating
EL
high
doping
concentrations
maximum
external
quantum
efficiency
(EQE
max
)
13.9
%,
leading
emitters.
Notably,
π‐bridge
flat
demonstrates
diminished
Coulombic
repulsion,
achieving
nearly
100
%
photoluminescence
yield
superior
horizontal
dipole
orientation
85
5
wt
doped
films,
corresponding
device‘s
EQE
reaches
record‐high
32.7
within
domain.
New Journal of Chemistry,
Journal Year:
2024,
Volume and Issue:
49(3), P. 755 - 760
Published: Dec. 4, 2024
Cu(
i
)
and
Ag(
complexes
emitting
thermally
activated
delayed
fluorescence
from
intra-ligand
charge
transfer
excited
states
with
different
energies
are
investigated.
Materials Horizons,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Jan. 1, 2024
A
pH
and
H
2
O
-monitoring
dressing
(MoO
3−
x
–EuBG–SA)
composed
of
sodium
alginate,
EuBG
particles
MoO
nanosheets
was
successfully
prepared
for
diabetic
wound
management
accelerating
healing.
Angewandte Chemie,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Dec. 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.
