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
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.
This
review
explores
the
pivotal
role
of
scintillators
in
biomedical
applications,
with
a
particular
emphasis
on
their
utilization
context
X-ray
excitation.
It
commences
an
in-depth
analysis
two
predominant
categories
scintillators:
inorganic
and
organic,
meticulously
delineating
distinctive
properties
respective
applications.
The
discourse
subsequently
advances
to
explore
critical
applications
X-ray-excited
(XESs),
underscoring
significant
advancements
medical
imaging,
radiation
detection,
dosimetry.
Moreover,
identifies
prevailing
challenges
limitations
deployment
these
for
purposes,
thereby
establishing
robust
foundation
ongoing
research
endeavors.
outlines
potential
directions,
advocating
interdisciplinary
collaborations
overcome
existing
barriers.
By
synthesizing
current
knowledge
identifying
areas
future
investigation,
this
aims
guide
researchers
enhancing
efficacy
application
science.
CrystEngComm,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 1, 2025
High
quality
Bmpip
2
SnBr
4
:12%
Cu
+
single
crystal
scintillator
was
successfully
prepared
by
space-limited
slow
cooling
crystallization
in
aqueous
solution.
The
optimized
scintillators
present
ultrafast
lifetime
and
excellent
light
yield.
Advanced Optical Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Oct. 25, 2024
Abstract
Organic
light‐emitting
diodes
(OLEDs)
employing
multi‐resonance
(MR)
emitters
have
attracted
much
attention
due
to
their
high
luminescent
efficiency
and
color
purity,
however,
the
development
of
deep‐blue
OLEDs
is
hindered
by
lack
suitable
sensitizers.
Here
a
novel
design
strategy
reported
for
thermally
activated
delayed
fluorescence
sensitizer
with
reverse
intersystem
crossing
(k
RISC
)
radiative
transition
R
rate
regulating
atom
distribution
spatially‐aligned
carbazole
donor/diphenylpyrimidine
acceptor
structure
manipulate
through‐space
charge
transfer
(CT)
process.
It
found
that
diphenylpyrimidine
1,3‐position
nitrogen
atoms
un‐conjugated
bridging
phenyl
moiety
conjugation
node
pyrimidine,
while
1,5‐position
conjugated
through
site,
opening
through‐bond
CT
pathway
via
besides
from
spatial
donor‐acceptor
interactions.
As
result,
exhibits
enhanced
oscillator
strength
3.5
folds
accelerated
k
3.57
×
10
7
s
−1
,
keeping
4.03
6
singlet
(S
1
state
(2.88
eV).
Solution‐processed
using
emitter
exhibit
efficient
narrowband
electroluminescence
CIE
coordinates
(0.14,
0.13)
EQE
max
15.6%,
representing
state‐of‐the‐art
device
performance
solution
