Abstract
Hydrogen
bonding
as
a
multifunctional
tool
has
always
influenced
the
structure
of
hybrid
perovskites.
Compared
with
research
on
hydrogen
bonding,
study
halogen‐halogen
interactions
and
properties
perovskites
is
still
in
its
early
stages.
Herein,
polar
bilayered
perovskite
(IEA)
2
FAPb
I
7
(IEA
+
2‐iodoethyl‐1‐ammonium,
FA
formamidinium)
iodine‐substituted
spacer
successfully
constructed
by
changing
configuration
interlayer
cations
regulating
non‐covalent
at
organic–inorganic
interface,
which
shows
shorter
spacing
higher
density
(
ρ
=
3.862
g
cm
−3
).
The
generation
polarity
caused
synergistic
effect
interactions.
Especially,
length
carbon
chain
organic
decreases,
I‐‐‐I
interaction
system
gradually
strengthens,
may
be
main
reason
for
symmetry‐breaking.
Polarity‐induced
bulk
photovoltaics
V
oc
1.0
V)
endow
device
based
(I‐EA)
exhibit
high
sensitivity
175.6
µC
Gy
−1
−2
an
ultralow
detection
limit
60.4
nGy
s
0
bias
under
X‐ray
irradiation.
results
present
facile
approach
designing
perovskites,
also
providing
useful
assistance
future
Journal of the American Chemical Society,
Год журнала:
2024,
Номер
146(30), С. 21120 - 21128
Опубликована: Июль 22, 2024
Since
the
concept
of
"multiferroic"
was
first
proposed
in
1968,
coupling
effect
between
different
ferroic
orders
has
attracted
great
interest
energy,
information,
and
biomedical
fields.
However,
fully
ferroelectric-fully
ferroelastic
never
been
experimentally
observed
hybrid
perovskites,
even
though
this
predicted
to
exist
half
a
century
ago.
Realizing
such
cross-linking
effects
polarization
vectors
strain
tensors
always
huge
challenge
because
complex
difference
these
two
origins.
Here,
we
report
multiferroic
with
full
ferroelectricity
ferroelasticity
two-dimensional
(2D)
perovskites
based
on
ferroelectrochemistry.
The
dynamic
molecular
reorientations
endow
(cyclohexanemethylaminium)
Journal of the American Chemical Society,
Год журнала:
2024,
Номер
146(32), С. 22469 - 22475
Опубликована: Авг. 1, 2024
Rational
design
of
structural
polarization
is
vital
for
modern
technologies,
as
it
allows
the
physical
properties
functional
materials
to
be
tailored.
An
effective
approach
governing
involves
utilization
stereochemical
lone-pair
electrons
(LPEs).
However,
despite
recognized
significance
LPEs
in
controlling
polarization,
there
remains
a
lack
understanding
regarding
quantitative
relationship
between
their
expression
and
extent
polarization.
Here,
by
using
pressure
continuously
tune
LPE
expression,
we
achieve
precise
control
quantification
which
brings
enhanced
second
harmonic
generation
(SHG)
molecular
crystal
SbI
Nature Communications,
Год журнала:
2025,
Номер
16(1)
Опубликована: Янв. 15, 2025
Metal-organic
frameworks
that
feature
hybrid
fluorescence
and
phosphorescence
offer
unique
advantages
in
white-emitting
communities
based
on
their
multiple
emission
centers
high
exciton
utilization.
However,
it
poses
a
substantial
challenge
to
realize
superior
white-light
single-component
metal-organic
without
encapsulating
varying
chromophores
or
integrating
phosphor
subunits.
Here,
we
achieve
high-performance
with
photoluminescence
quantum
yield
of
81.3%
via
boosting
triplet
excitons
distribution
through
pressure
treatment
Zn-IPA
frameworks.
A
novel
metal-ligand
asymmetrical
chelate
coordination
is
successfully
integrated
into
the
after
high-pressure
over
~20.0
GPa.
This
modification
unexpectedly
endows
targeted
sample
new
emergent
electronic
state
narrow
singlet-triplet
energy
gap,
which
effectively
accelerates
spin-flipping
process
for
boosted
population.
Time
delay
phosphor-converted
light-emitting
diodes
are
fabricated
long
time
up
~7
s
switching
off,
providing
significant
advancements
time-delay
lighting
applications.
Pressure-treatment
can
alter
optical
properties
Here
authors
induce
amorphization
remains
decompression
enables
efficient
narrowing
gap.
Advanced Functional Materials,
Год журнала:
2024,
Номер
34(27)
Опубликована: Март 4, 2024
Abstract
As
a
fundamental
thermodynamic
parameter,
pressure
serves
as
an
effective
tool
to
control
the
structures
and
properties
of
functional
materials.
To
date,
numerous
pressure‐engineering
methods
have
been
introduced
enhance
perovskite
devices.
This
paper
comprehensively
reviews
advances
in
understanding
effects
on
materials
devices,
encompassing
both
low
high‐pressure
influences.
These
are
categorized
into
six
distinct
groups
based
their
underlying
mechanisms,
detailing
evolution
from
macroscopic
microscopic
levels,
exploring
interplay
between
these
characteristics.
Finally,
current
challenges
offer
insights
future
prospects
for
harnessing
further
develop
structures,
properties,
devices
assessed.
Angewandte Chemie International Edition,
Год журнала:
2024,
Номер
63(29)
Опубликована: Май 1, 2024
Abstract
The
dual
emission
(DE)
characteristics
of
atomically
precise
copper
nanoclusters
(Cu
NCs)
are
significant
theoretical
and
practical
interest.
Despite
this,
the
underlying
mechanism
driving
DE
in
Cu
NCs
remains
elusive,
primarily
due
to
complexities
excited
state
processes.
Herein,
a
novel
[Cu
4
(PPh
3
)
(C≡C−
p
−NH
2
C
6
H
]PF
(
NC,
shielded
by
alkynyl
exhibiting
DE,
was
synthesized.
Hydrostatic
pressure
applied
,
for
first
time,
investigate
DE.
With
increasing
pressure,
higher‐energy
peak
gradually
disappeared,
leaving
lower‐energy
as
dominant
emission.
Additionally,
crystal
exhibited
notable
piezochromism
transitioning
from
cyan
orange.
Angle‐dispersive
synchrotron
X‐ray
diffraction
results
revealed
that
reduced
inter‐cluster
distances
under
brought
peripheral
ligands
closer,
leading
formation
new
C−H⋅⋅⋅N
N−H⋅⋅⋅N
hydrogen
bonds
.
It
is
proposed
these
strengthened
bond
interactions
limit
ligands′
vibration,
resulting
vanishing
peak.
In
situ
high‐pressure
Raman
vibrationally
resolved
spectra
demonstrated
benzene
ring
C=C
stretching
vibration
structural
source
Advanced Optical Materials,
Год журнала:
2024,
Номер
12(35)
Опубликована: Июль 16, 2024
Abstract
Building
an
explicit
structure‐property
relationship
for
two‐dimensional
(2D)
hybrid
perovskites
is
critical
to
guide
the
synthesis
of
highly
luminescent
materials.
However,
traditional
studies
are
limited
deviation
individual
intra‐octahedron,
which
fails
well
reflect
collective
lattice
distortion.
Here,
a
set
new
structural
distortion
descriptors
associated
with
inter‐octahedra
introduced
2D
perovskite
(C
7
H
10
N)
2
PbBr
4,
that
is,(PMA)
4
through
pressure
engineering.
An
experimental
conclusion
reached
adjacent
Pb
displacement,
as
inter‐octahedron
distortion,
effective
parameter
in
determining
and
emission
behavior
(PMA)
under
high
pressure.
Under
pressure,
exhibits
two
behaviors,
free
excitons
(FEs)
self‐trapped
(STEs)
emission.
Different
types
four‐Pb‐shaped
quadrilateral
correspond
different
emissions:
square‐type
(only
FEs
emission),
parallelogram‐type
(coexistence
STEs
kite‐type
emission).
Moreover,
enhanced
violet
at
≈431
nm
achieved
mild
1.0
GPa,
crucial
light
source
medical
sterilization.
The
underlying
clarified
fundamentally
deepens
photophysical
mechanism
,
thus
facilitating
design
high‐efficiency
luminophores.
Matter and Radiation at Extremes,
Год журнала:
2025,
Номер
10(3)
Опубликована: Апрель 28, 2025
High-pressure
research
has
emerged
as
a
pivotal
approach
for
advancing
our
understanding
and
development
of
optoelectronic
materials,
which
are
vital
wide
range
applications,
including
photovoltaics,
light-emitting
devices,
photodetectors.
This
review
highlights
various
in
situ
characterization
methods
employed
high-pressure
to
investigate
the
optical,
electronic,
structural
properties
materials.
We
explore
advances
that
have
been
made
techniques
such
X-ray
diffraction,
absorption
spectroscopy,
nonlinear
optics,
photoluminescence
Raman
photoresponse
measurement,
emphasizing
how
these
enhanced
elucidation
transitions,
bandgap
modulation,
performance
optimization,
carrier
dynamics
engineering.
These
insights
underscore
role
optimizing
tailoring
materials
future
applications.
The Journal of Physical Chemistry Letters,
Год журнала:
2024,
Номер
15(7), С. 2031 - 2038
Опубликована: Фев. 13, 2024
Three-dimensional
(3D)
cationic
lead
halide
hybrids
constructed
by
organic
ions
and
inorganic
networks
via
coordination
bonds
are
a
promising
material
for
solid-state
lighting
due
to
their
exceptional
environmental
stability
broad-spectrum
emission.
Nevertheless,
fluorescence
properties
hindered
the
limited
lattice
distortion
from
extensive
connectivity
within
network.
Here,
dramatic
100-fold
enhancement
of
self-trapped
exciton
(STE)
emission
is
achieved
in
3D
hybrid
[Pb2Br2][O2C(CH2)4CO2]
pressure-triggered
phase
transition.
Notably,
pressure-treated
exhibits
110
nm
redshift
with
1.5-fold
compared
initial
state
after
pressure
was
completely
released.
The
irreversible
structural
transition
intensifies
[PbBr3O3]
octahedral
distortion,
which
highly
responsible
optimization
quenched
These
findings
present
strategy
improving
optical
relatively
high
thus
facilitate
practical
applications
pressure-driven
engineering.
Inorganic Chemistry,
Год журнала:
2024,
Номер
63(24), С. 11431 - 11437
Опубликована: Май 30, 2024
Lead-free
organic–inorganic
hybrid
perovskites
are
one
class
of
promising
optoelectronic
materials
that
have
attracted
much
attention
due
to
their
outstanding
stability
and
environmentally
friendly
nature.
However,
the
intrinsic
band
gap
far
from
Shockley–Queisser
limit
inferior
electrical
properties
largely
applicability.
Here,
a
considerable
band-gap
narrowing
2.43
1.64
eV
with
compression
rate
up
32.5%
is
achieved
via
high-pressure
engineering
in
lead-free
perovskite
MA3Sb2I9.
Meanwhile,
electric
transport
process
changes
initial
interaction
both
ions
electrons
only
contribution
upon
compression.
The
alteration
characteristics
ascribed
vibration
limitation
organic
enhanced
orbital
overlap,
resulting
reduction
Sb–I
bond
length
through
pressure-induced
phase
transitions.
This
work
not
systematically
investigates
correlation
between
structural
MA3Sb2I9
but
also
provides
potential
pathway
for
optimizing
perovskites.
