Angewandte Chemie,
Год журнала:
2024,
Номер
unknown
Опубликована: Окт. 9, 2024
Abstract
Zero‐dimensional
(0D)
structured
lead‐free
metal
halides
have
recently
attracted
widespread
attention
due
to
their
high
photoluminescence
quantum
yield
(PLQY)
and
negligible
self‐absorption,
showing
enormous
potential
as
optical
waveguides
towards
miniaturized
photonic
devices.
However,
the
great
difficulty
in
growth
of
rod‐like
nano/micro‐sized
morphologies,
such
applications
been
less
explored.
Herein,
a
new‐type
emissive
organic–inorganic
manganese
(II)
halide
crystal
(TPS
2
MnCl
4
,
TPS=C
18
H
15
S,
triphenylsulfonium)
form
microrods
is
synthesized
via
facile
chloride
ion
(Cl
−
)
induced
oriented
method.
Due
combination
attractive
features
PLQY
86
%,
self‐absorption
smooth
surface,
TPS
are
well
suited
for
use
waveguide
with
an
ultra‐low
loss
coefficient
1.20
⋅
10
−4
dB
μm
−1
superior
that
most
hybrids,
organic
materials,
polymers
nanoclusters
best
our
knowledge.
Importantly,
can
further
work
dual‐mode
waveguides,
combining
active
passive
light
transmission
functionalities
one
single
crystal.
In
addition,
also
display
remarkable
performance
lighting
anti‐counterfeiting
distinct
properties
commendable
stability.
Advanced Optical Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 30, 2025
Abstract
Lead
halide
perovskites
(LHP)
are
solution‐processable
semiconductor
materials
with
high
optical
gain
and
broad
wavelength
tunability,
making
them
well‐suited
for
laser
applications.
Here,
a
solution‐based
method
the
3D
conformal
coating
of
LHP
microcrystals
noble
metals
is
presented.
A
nanoscale
metal
layer
found
to
significantly
enhance
both
performance
environmental
stability.
This
enables
gold‐coated
CsPbBr
3
be
delivered
into
live
cells,
achieving
single‐mode
plasmonic
lasing
under
pumping.
Silver‐coated
particles
demonstrate
stable
in
air.
one‐pot
synthesis
opens
new
possibilities
leveraging
LHPs
implant
micro‐laser
sources
physical,
biological,
industrial
systems.
Nature Communications,
Год журнала:
2025,
Номер
16(1)
Опубликована: Март 27, 2025
Abstract
Layered
2D
semiconductors,
when
grown
into
1D
nanowires,
can
exhibit
excellent
optical
and
electronic
properties,
promising
for
nanoscale
optoelectronics
photonics.
However,
rational
strategies
to
grow
such
nanowires
are
lacking.
Here,
we
present
a
large
family
of
quantum-well
made
from
organic-inorganic
hybrid
metal
halide
perovskites
with
tunable
well
thickness,
organic
spacer
cations,
anions,
achieved
by
harnessing
directional
nonvalent
intermolecular
interactions
among
certain
cations.
The
unusual
anisotropic
growth
within
the
plane
is
induced
preferential
self-assembly
selected
cations
along
direction
stronger
further
promoted
crystal
engineering.
Owing
intrinsic
quantum-well-like
structures
photon
confinement
at
subwavelength
scale,
these
robust
exciton-photon
coupling,
Rabi
splitting
energies
up
700
meV,
as
wavelength-tunable
more
efficient
lasing
compared
exfoliated
crystals.
Advanced Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 19, 2025
Abstract
Perovskite
smart
windows
(PSWs)
are
widely
investigated
owing
to
excellent
thermochromic
properties,
while
restricted
by
poor
transition
performance
and
cycle
stability.
Herein,
dimethyl
sulfoxide
vapor
is
utilized
as
an
induction
reagent
for
rapid
reversible
switching
at
room
temperature
between
the
colored
bleached
phases.
To
obtain
PSWs
with
different
optical
properties
performance,
red
CsPbIBr
2
,
yellow
Rb
0.5
Cs
PbIBr
brown
CsSn
0.1
Pb
0.9
IBr
prepared
through
alloying.
The
perovskites
can
exhibit
27.4–34.3
°C
within
1.9–5.1
min.
Even
after
100
cycles,
they
remarkable
stability
of
luminous
transmittance
(retention
≥97.4%)
time
≥97.6%).
Experimental
characterization
proves
that
occurs
three‐dimension
perovskite
phase
zero‐dimension
phase.
In
field
test
(air
=
21.6–26.5
°C),
model
houses
a
maximum
indoor
drop
4.2
°C.
Furthermore,
considerable
modulation
ability
up
7.9
under
solar
simulator
(temperature
control
house
60
°C).
decrease
in
20
days
2.9%,
indicating
long‐term
This
study
offers
prominent
long
Research Square (Research Square),
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 20, 2025
Abstract
The
bandgap
engineering
of
halide
perovskites
at
microscopic
level
is
challenging
due
to
fabrication
complexity,
environmental
sensitivity
and
material
stability.
Here
we
report
a
facile
approach
high-yield
compositional
graded
perovskite
nanowires
(NWs)
via
vapor-phase
anion
exchange
methods.
Using
rationally
engineered
thermal
inhomogeneity
along
the
length
single
NWs,
arrays
NWs
with
gradient
across
tens
micrometers
can
be
readily
mass-produced
bottom-up
as
well
top-down
strategies.
These
exchanged
exhibit
well-preserved
single-crystallinity
for
efficient
optical
electrical
transport,
while
their
halogen
stoichiometry,
fluorescence,
energy
band
structure
demonstrate
apparent
axial
gradient.
Detailed
analysis
elemental
distribution
simulation
reveal
that
ultralow
conductivity
together
reduced
dimensionality
leads
microscale
temperature
gradient,
which
further
converted
upon
exchange.
In
addition,
show
excellent
optoelectronic
features
suitable
integration
into
functional
devices.
This
work
provides
guidelines
composition
manipulation
through
engineering,
extending
applications
in
ultracompact
microspectrometers,
spectral
imaging
sensors,
other
miniaturized
Two-dimensional
(2D)
organic-inorganic
halide
perovskites
are
solution-processable
semiconductors
that
promising
for
optoelectronic
applications.
Understanding
crystallization
mechanisms
to
achieve
control
over
nanostructures
is
important
optimizing
desired
properties.
Here
we
introduce
a
versatile
strategy
synthesize
spiral
microplates
of
diverse
2D
at
the
air-water
interface
through
screw-dislocation-driven
growth.
Spirals
11
perovskite
compositions
(LA)2(A)n-1PbnX3n+1
with
different
spacer
(LA)
cations,
A-cations,
(X)
anions,
and
n-number
can
be
grown.
They
typically
consist
single-
or
few-layer
step
heights
but
exhibit
stacking
complexity
when
multiple
dislocations
interact.
The
characteristic
optical
properties
(photoluminescence
second-harmonic
generation)
underlying
perovskites.
Fluorescence-detected
circular
dichroism
imaging
shows
chirality
center
does
not
translate
observed
chiroptical
microplate,
consistent
length
scale
chiral
distortion.
This
solution
growth
spirals
diversifies
microstructures
optoelectronics
other
Two-dimensional
(2D)
organic
lateral
heterostructures
(OLHs)
integrating
two
or
more
components
have
important
potential
applications
in
optoelectronics.
However,
the
controlled
synthesis
of
2D
OLHs
with
in-plane
tunable
emission
remains
a
great
challenge
owing
to
difficulty
sequential
integration
multiple
components.
Here,
cascaded
strategy
is
demonstrated
for
hierarchical
assembly
multicolor
emission,
from
red-blue
and
red-green
red-green-blue
(RGB),
size
~15
micrometers.
The
regions
are
realized
by
synergistic
effects
molecular
doping
method
photo-induced
oxidation
route
during
epitaxial
growth
process.
obtained
can
actively
achieve
full-spectrum
light
transport
420
720
nanometers
depending
on
different
excitation
positions
thus
function
as
multimode
RGB
signal
converters.
These
findings
provide
insights
into
development
next-generation
Advanced Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Март 17, 2025
Abstract
Low
lasing
threshold
and
long‐term
operational
stability
are
essential
in
advancing
cost‐effective,
efficient
lead‐free
(tin)
halide
perovskite
lasers.
However,
the
rapid
crystallization
of
tin
perovskites
oxidation
Sn
2+
lead
to
substantial
amounts
lattice
defects,
detrimental
laser
performance
enhancement.
Herein,
a
dual
suppression
strategy
is
developed
suppress
2D
perovskites,
i.e.,
adopting
an
oxygen‐free
two‐step
growth
enhance
crystal
quality
incorporating
electron‐donating
biuret
molecules
coordinate
with
during
growth,
which
led
reduction
<1
µJ
cm
−
2
(PEA)
MASn
I
7
.
This
represents
lowest
value
nanolasers
approximately
one
order
magnitude
lower
than
those
previously
reported
for
tin‐based
nanolasers.
Investigations
into
spontaneous
photoluminescence
(PL)
stimulated
emission
revealed
that
exhibited
superior
photostability
compared
their
counterparts.
Specifically,
intensity
MA
3
10
constantly
increased
by
>300%
under
optical
pumping
decreased
≈17%,
not
observed
The
findings
highlight
prospect
as
gain
materials
cavities
solution‐processed
low
thresholds
exceptional
stability.
Research Square (Research Square),
Год журнала:
2025,
Номер
unknown
Опубликована: Апрель 11, 2025
Abstract
The
orientation
and
magnitude
of
optical
polarization
in
trivalent
lanthanides
(Ln³⁺)
depend
on
the
directional
arrangement
individual
transition
dipole
moments
(TDMs),
rendering
great
difficulty
achieving
polarized
propagation
that
is
highly
determined
by
packing
symmetry
compositional
coordination
atomic
precision.
Here,
we
obtained
crystals
organic-monolayer
protected
titanium-alloyed
lanthanide
nanoclusters
(i.e.,
Eu₈Ti10
NCs),
where
TDMs
Eu³⁺
ions
generate
typically
orthogonal
behaviors
π/σ-light)
from
5D₀→7F1,2
transition.
Most
importantly,
Eu₈Ti₁₀
single
crystal
presents
a
remarkable
with
unprecedented
anisotropy
relevant
to
crystallographic
axis,
thus
resulting
an
on-crystal
modulator.