Chemistry - A European Journal,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Nov. 6, 2024
Abstract
X‐ray
scintillators,
materials
that
convert
high‐energy
radiation
into
detectable
light
in
the
ultraviolet
to
visible
spectrum,
are
widely
used
industrial
and
medical
applications.
Organic
organic‐inorganic
hybrid
systems
have
emerged
as
promising
alternatives
for
detection
imaging
due
their
mechanical
flexibility,
lightweight,
tunable
excited
states,
solution
processability
large‐scale
fabrication.
However,
these
often
suffer
from
weak
absorption
insufficient
exciton
utilization,
which
seriously
affects
scintillation
performance,
limiting
potential
broader
application
commercialization.
This
review
highlights
recent
advances
molecular
engineering
developing
high‐performance
scintillators.
It
focuses
on
design
principles,
such
heavy
atom
effect,
donor‐acceptor/host‐guest
strategies,
hydrogen/halogen
bonding,
sensitization,
crystal
packing,
enhancing
performance.
By
leveraging
approaches,
researchers
made
significant
strides
improving
efficiency
advancing
of
commercial
ACS Materials Letters,
Journal Year:
2025,
Volume and Issue:
unknown, P. 457 - 464
Published: Jan. 3, 2025
Violet
organic
light-emitting
diodes
(OLEDs)
hold
promise
for
advanced
applications,
yet
achieving
simultaneously
high
efficiency
and
color
purity
remains
challenging.
This
study
presents
a
rational
design
of
violet
emitters
by
establishing
through-space
charge
transfer
(TSCT)
framework
that
enhances
high-level
reverse
intersystem
crossing
(hRISC)
the
effective
utilization
triplet
excitons.
Two
TSCT
emitters,
BO-MX-ICz
tBO-MX-ICz,
are
tailored
with
weak
donor
acceptor
bridged
9,9-dimethylxanthene
in
face-to-face
stacking
arrangement.
These
show
narrow
photoluminescence
(PL)
efficiency.
Their
OLEDs
exhibit
high-color-purity
electroluminescence
(EL)
peaks
at
406
408
nm,
full
width
half-maximum
(fwhm)
25
maximum
external
quantum
efficiencies
(ηext,maxs)
4.61%
5.03%.
Additionally,
as
hosts
green
multiresonance
(MR)
they
deliver
EL
spectra
excellent
ηext,maxs
up
to
34.36%.
molecular
strategy
could
advance
high-performance
short-wavelength
optoelectronic
devices.
Angewandte Chemie International Edition,
Journal Year:
2024,
Volume and Issue:
63(46)
Published: July 5, 2024
Organic
scintillators
are
praised
for
their
abundant
element
reserves,
facile
preparation
procedures,
and
rich
structures.
However,
the
weak
X-ray
attenuation
ability
low
exciton
utilization
efficiency
result
in
unsatisfactory
scintillation
performance.
Herein,
a
new
family
of
highly
efficient
organic
phosphonium
halide
salts
with
thermally
activated
delayed
fluorescence
(TADF)
designed
by
innovatively
adopting
quaternary
as
electron
acceptor,
while
dimethylamine
group
anions
(I
Advanced Functional Materials,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 7, 2025
Abstract
Through‐space
charge‐transfer
(TSCT)
thermally‐activated
delayed
fluorescence
(TADF)
emitters
have
been
extensively
explored
for
organic
light‐emitting
diodes
(OLEDs),
but
their
low
radiative
decay
rates
(
k
r,s
)
remained
a
formidable
obstacle
to
enhancement
of
luminescent
efficiency
(Ф
PL
and
suppression
roll‐off
the
OLED.
Here,
multi‐π‐stacked
TSCT‐TADF
with
accelerated
are
developed
3D
[fixed
acceptor]/donor/[fixed
acceptor]
structure
formed
on
two
individual
fluorene
bridges.
Single‐crystal
structures
theoretical
calculations
reveal
cis
or
trans
‐configurations
acceptors
around
central
donor
double
TSCT
channels
in
emitter.
In
doped
films,
show
green‐blue
TADF
high
up
1.1
×
10
7
s
−1
near‐unity
Ф
,
which
notably
improved
compared
single‐π‐stacked
analog
=
2.1
6
0.89).
OLEDs
based
external
quantum
efficiencies
(EQEs)
26.2%
EQEs
at
1000
cd
m
−2
(EQE
remain
23.4%,
superior
over
device
max
/EQE
20%/15.6%).
A
narrowband
blue‐green
OLED
one
emitter
as
sensitizer
shows
EQE
37.6%/27.7%.
The
work
demonstrates
great
potential
enhancing
high‐efficiency
roll‐offs.
Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
35(1)
Published: Sept. 20, 2024
Abstract
Simultaneously
improving
radiative
decay
and
reverse
intersystem
crossing
(RISC)
of
through‐space
charge‐transfer
(TSCT)
thermally‐activated
delayed
fluorescence
(TADF)
emitters
has
remained
a
challenge.
Here,
space‐confined
TSCT‐TADF
are
developed
with
planar
indolo[3,2,1‐
kl
]phenoxazine
donor,
spiro‐carbon‐fixed
benzophenone
acceptor,
fluorene
(for
1
)
or
xanthene
2
bridge.
Close,
cofacial
donor/acceptor
alignments
efficient
intramolecular
TSCT
have
been
observed
for
both
emitters.
Intriguingly,
emitter
exhibits
an
intermolecular
interaction
as
strong
the
one,
which
opens
TSCT,
rate
(
k
r,s
to
same
level
featuring
much
stronger
interaction.
The
also
largely
enhances
RISC
).
In
20
wt.%
doped
films,
show
green
TADF
high
/
at
1.1
×
10
7
s
−1
/1.3
6
1.2
/7.7
5
,
respectively.
Organic
light–emitting
diodes
(OLEDs)
using
external
quantum
efficiencies
(EQEs)
up
27.5%
low‐efficiency
roll‐offs.
Hyperfluorescent
OLEDs
sensitizers
afford
narrowband
blue‐green
emission
EQEs
30.6%
suppressed
efficiency
work
reveals
that
strengthening
is
promising
avenue
simultaneously
improve
r,s,
high‐performance
OLEDs.
Chemical Communications,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 1, 2025
Through-space
charge-transfer
polybenzonorbornenes,
consisting
of
a
carbazole
donor
and
dimesitylboron
acceptor
in
the
ortho-positions
phenyl
units
on
benzonorbornene
repeating
unit,
have
been
developed,
revealing
efficient
thermally
activated
delayed
fluorescence
emission
full-colorpiezochromism.
Journal of the American Chemical Society,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Dec. 16, 2024
Organic
phosphorescence
or
thermally
activated
delayed
fluorescence
(TADF)
scintillators,
while
effective
in
utilizing
triplet
excitons,
are
sensitive
to
temperature
changes,
which
can
impact
radioluminescence
performance.
In
this
study,
we
have
developed
a
type
of
temperature-adaptive
organic
scintillator
with
and
TADF
dual
emission.
These
scintillators
automatically
switch
modes
enabling
efficient
from
77
400
K.
The
highest
photoluminescence
quantum
yield
light
83.2%
78,229
±
562
photons
MeV
Advanced Optical Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Oct. 15, 2024
Abstract
Photothermal
modulated
excited
conformations
in
traditional
optoelectronic
materials
have
been
extensively
investigated
for
the
manipulation
of
emissive
properties.
However,
photoinduced
molecular
synergetic
conformational
changes,
which
are
promising
controlling
intramolecular
energy
transfer
modes
through
orbital
breaking,
never
explored.
Herein,
a
novel
o
‐carborane
dyad
composed
carbazole
units
as
electron
donors
and
triazine
derivatives
acceptors
is
demonstrated
to
achieve
conformation‐dependent
emissions
abundant
via
changes.
Notably,
resulting
exhibited
multiple
changes
that
induced
different
involved
“through
space”
bond.”
Exactly,
spin
from
singlet
triplet
state
took
flip
accompanied
by
orbitals
π–π
space
charge
style
π
σ
bond
mode.
The
circularly
polarized
luminescence
(CPL)
properties
systematically
investigated,
exhibiting
intense
CPL
with
large
g
lum
values.
These
results
provide
perspectives
elucidating
complicated
emission
aggregated
states,
well
unique
on
relationship
between
conformations,
modes,
breaking.
Advanced Functional Materials,
Journal Year:
2025,
Volume and Issue:
unknown
Published: March 18, 2025
Abstract
Thermochromic
fluorescent
materials
(TFMs)
have
garnered
great
attention
due
to
their
unique
fluorescence
transition
responsive
temperature.
However,
the
application
of
TFMs
is
limited
defects
such
as
low
thermosensitivity
and
a
high
temperature‐responsive
threshold
value.
In
this
case,
work
explores
feasible
strategy
for
designing
TFMs.
On
one
hand,
sterically
hindered
unilateral
tetraphenylethylene
(TPE)
substituent
introduced
into
pyrene
chromophore
in
meta‐
linkage
mode.
This
type
molecular
architecture
aimed
at
integration
both
aggregation‐induced
emission
(AIE)
character
isolated
π–π
dimer
stacking,
facilitating
achievement
contrast
intensity
(i.e.,
strongly
emissive
aggregation
state
versus
weakly
dispersion
state)
color
(
i.e
,
excimer
monomer).
other
an
effective
matrix
platform
featured
with
alky
chain
length‐dependent
temperature‐induced
phase
constructed
assist
fabrication
desired
patterns
through
temperature‐controlled
reversible
between
crystalline
non‐dispersion
liquated
states.
The
findings
demonstrate
that
these
studied
can
be
potentially
applied
temperature
indicators
switchable
dynamic
interior
decoration,
which
provides
new
avenue
design
