Pressure‐Tuning Localized Excitons Toward Enhanced Emission, Photocurrent Enhancement and Piezochromism in Unconventional ACI‐Type 2D Hybrid Perovskites
Angewandte Chemie International Edition,
Год журнала:
2024,
Номер
63(46)
Опубликована: Авг. 7, 2024
Simultaneous
enhancement
of
free
excitons
(FEs)
emission
and
self-trapped
(STEs)
remains
greatly
challenging
because
the
radiative
pathway
competition.
Here,
a
significant
fluorescence
improvement,
associated
with
recombination
both
FEs
STEs
is
firstly
achieved
in
an
unconventional
ACI-type
hybrid
perovskite,
(ACA)(MA)PbI
Язык: Английский
Mechanism of Pressure‐Modulated Self‐Trapped Exciton Emission in Cs2TeCl6 Double Perovskite
Small,
Год журнала:
2024,
Номер
unknown
Опубликована: Сен. 2, 2024
Abstract
Pressure‐modulated
self‐trapped
exciton
(STE)
emission
mechanism
in
all‐inorganic
lead‐free
metal
halide
double
perovskites
characterized
by
large
Stokes‐shifted
broadband
emission,
has
attracted
much
attention
across
various
fields
such
as
optics,
optoelectronics,
and
biomedical
sciences.
Here,
employing
the
perovskite
Cs
2
TeCl
6
a
paradigm,
authors
elucidate
that
performance
of
STE
can
be
modulated
pressure,
attributable
to
pressure‐induced
evolution
electronic
state
(ES).
Two
ES
transitions
happen
at
pressures
1.6
5.8
GPa,
sequentially.
The
behaviors
jointly
both
pressure
transitions.
When
reaches
Huang–Rhys
factor
S,
indicative
strength
electron‐phonon
coupling,
attains
an
optimum
value
≈12.0,
correlating
with
photoluminescence
(PL)
intensity
is
4.8‐fold
its
PL
under
ambient
pressure.
Through
analyzing
pressure‐dependent
dynamic
behavioral
changes,
have
revealed
microphysical
underlying
pressure‐modulated
enhancement
quenching
.
Язык: Английский
Pressure‐Induced Conformation Transition and Chiral Inversion Toward Enhanced Bright White Light From 1D Chiral Perovskite
Advanced Optical Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Фев. 27, 2025
Abstract
The
introduction
of
chiral
molecules
can
impart
chirality
to
low‐dimensional
perovskite,
thereby
enhancing
its
potential
in
sensing
and
information
storage
applications.
Nevertheless,
the
limited
photoluminescence
efficiency
greatly
restricts
broader
utility.
Here,
a
very
bright
white
light
is
achieved
from
pressure‐induced
emission
(PIE)
1D
OIHPs
S‐C
6
H
5
CH(CH
3
)NH
PbBr
(S‐MPAPbBr
)
crystal,
which
exhibited
24.6‐fold
increase
intensity.
circular
dichroism
(CD)
spectrum
simultaneous
inversion
enhancement,
establishing
it
as
multifunctional
material
PIE
luminogens
(PIEgens).
Furthermore,
upon
releasing
pressure
ambient
conditions,
be
stabilized
with
Commission
Internationale
de
l’Éclair‐age
(CIE)
chromaticity
coordinates
(0.30,
0.29)
correlated
color
temperature
(CCT)
7998
K.
In
situ
high‐pressure
experiments
first‐principles
calculations
indicated
that
irreversible
structural
amorphization
associated
steric
hindrance
effect
responsible
for
retention
cold‐white
light.
conformation
transition
S‐MPA
+
cations
induced
twisting
[PbBr
]
−
∞
chains,
thus
improving
PL
modulating
CD
signal.
research
elucidates
fundamental
structure‐property
relationship
offers
application
solid‐state
lighting
single‐component
well
regulation.
Язык: Английский
Pressure‐Tuning Localized Excitons Toward Enhanced Emission, Photocurrent Enhancement and Piezochromism in Unconventional ACI‐Type 2D Hybrid Perovskites
Angewandte Chemie,
Год журнала:
2024,
Номер
136(46)
Опубликована: Авг. 7, 2024
Abstract
Simultaneous
enhancement
of
free
excitons
(FEs)
emission
and
self‐trapped
(STEs)
remains
greatly
challenging
because
the
radiative
pathway
competition.
Here,
a
significant
fluorescence
improvement,
associated
with
recombination
both
FEs
STEs
is
firstly
achieved
in
an
unconventional
ACI‐type
hybrid
perovskite,
(ACA)(MA)PbI
4
(ACA=acetamidinium)
crystals
{PbI
6
}
octahedron
units,
through
hydrostatic
pressure
processing.
Note
that
exhibits
91.5‐fold
considerable
piezochromism
from
green
to
red
mild
interval
1
atm
2.5
GPa.
The
substantial
distortion
individual
halide
Pb−I−Pb
angles
between
two
octahedra
under
high
indeed
determines
pressure‐tuning
localized
behavior.
Upon
higher
pressure,
photocurrent
also
observed,
which
attributed
promoted
electronic
connectivity
.
anisotropic
compaction
reduces
distance
neighboring
organic
molecules
octahedra,
leading
hydrogen
bonding
interactions.
This
work
not
only
offers
deep
understanding
structure‐optical
relationships
perovskites,
but
presents
insights
into
breaking
limits
luminescent
efficiency
by
pressure‐suppressed
nonradiative
recombination.
Язык: Английский