Angewandte Chemie,
Год журнала:
2024,
Номер
136(22)
Опубликована: Март 25, 2024
Abstract
Endowing
perovskite
quantum
dots
(PQDs)
with
circularly
polarized
luminescence
(CPL)
offers
great
promise
for
innovative
chiroptical
applications,
but
the
existing
strategies
are
inefficient
in
acquiring
stimuli‐responsive
flexible
chiral
films
large,
tunable
dissymmetry
factor
(
g
lum
)
and
long‐term
stability.
Here,
we
report
a
strategy
design
synthesis
of
luminescent
cholesteric
liquid
crystal
elastomer
(Lumin‐CLCE)
mechanically
CPL,
which
is
enabled
by
crystal‐templated
self‐assembly
situ
covalent
cross‐linking
judiciously
designed
photopolymerizable
CsPbX
3
(X=Cl,
Br,
I)
PQD
nanomonomers
into
elastic
polymer
networks.
The
resulting
Lumin‐CLCE
showcase
structural
color
natural
light
noticeable
CPL
maximum
value
up
to
1.5
under
UV
light.
manipulation
intensity
rotation
direction
achieved
controlling
self‐assembled
helicoidal
nanostructure
handedness
soft
helices.
A
significant
breakthrough
lies
achievement
reversible,
perovskite‐based
switch
activated
biaxial
stretching,
enables
flexible,
dynamic
anti‐counterfeiting
labels
capable
decrypting
preset
information
specific
polarization
states.
This
work
can
provide
new
insights
development
advanced
materials
their
emerging
applications
encryption,
3D
displays,
beyond.
Abstract
Circularly
polarized
room‐temperature
phosphorescence
(CPRTP)
simultaneously
featuring
multiple
colors
and
extremely
high
dissymmetry
factor
(
g
lum
)
is
crucial
for
increasing
the
complexity
of
optical
characteristics
advancing
further
development,
but
such
a
type
CPRTP
still
unprecedented.
The
present
work
develops
an
effective
universal
strategy
to
achieve
full‐color
with
ultra‐high
factors
in
polymeric
cholesteric
superhelix
network,
which
constructed
by
liquid
crystal
polymer
chiral
helical
(CHP).
Taking
advantage
twisting
power
CHP,
resulting
network
exhibits
remarkable
activity.
Significantly,
adopting
simple
double‐layered
architectures
consisting
film
phosphorescent
films,
blue‐,
green‐,
yellow‐,
red‐CPRTP
emissions
are
successfully
obtained,
maximum
|
values
up
1.43,
1.39,
1.09
0.84,
respectively.
Further,
multilevel
information
encryption
application
demonstrated
based
on
multidimensional
architectures.
This
study
offers
new
insights
into
fabricating
considerable
performance
advanced
photonic
applications.
Chemistry - A European Journal,
Год журнала:
2024,
Номер
30(32)
Опубликована: Апрель 3, 2024
Abstract
D
2
‐symmetric
(
R
)‐binaphthyl‐bridged
pyrenophanes
containing
thioether
bonds
were
synthesized.
The
exhibited
the
temperature‐induced
sign
inversion
of
circularly
polarized
luminescence
(CPL)
while
maintaining
emission
wavelength
and
reversibility.
Δ
g
lum
value
reached
0.02,
FL
quenching
by
heat
was
negligible.
CPL
originates
from
intramolecular
excimer
chirality
associated
with
excitation
dynamics.
two
pyrenes
form
a
kinetically
trapped
left‐handed
twist
at
low
temperatures,
they
thermodynamically
favored
right‐handed
high
temperatures.
linkers
can
impart
flexibility
suitable
for
excimers.
Chemistry of Materials,
Год журнала:
2024,
Номер
36(8), С. 3851 - 3860
Опубликована: Апрель 13, 2024
Lead-free
halide
double
perovskites
(DPs)
have
attracted
extensive
attention
due
to
their
excellent
optoelectronic
properties,
but
the
synthesis
of
one-dimensional
(1D)
organic–inorganic
hybrid
DPs
with
high
photoluminescence
quantum
yield
(PLQY)
is
still
challenging
date.
Herein,
we
successfully
prepared
high-quality
1D
(TMA)2NaInCl6
(TMA
tetramethylammonium)
by
two
synthetic
routes
and
near-unity
PLQY
was
achieved
incorporating
Sb3+
ions
into
(TMA)2NaInCl6,
which
much
higher
than
that
3D
all-inorganic
DPs.
Temperature-dependent
PL
spectroscopic
characterizations
indicated
strong
electron–phonon
coupling
existed
in
excited
state
doped
system.
Density
functional
theory
calculations
revealed
incorporation
modulated
distribution
density
states
24-fold
enhancing
transition
probability
thereby
significantly
improved
PLQY.
Our
study
presented
new
physical
insights
for
in-depth
understanding
photophysical
mechanisms
should
be
very
important
regulating
optical
performance
perovskite
materials.
Advanced Optical Materials,
Год журнала:
2024,
Номер
12(19)
Опубликована: Апрель 30, 2024
Abstract
Functional
materials
that
exhibit
circularly
polarized
luminescence
(CPL)
have
shown
immense
potential
in
applications
such
as
3D
optical
displays
and
advanced
information
encryption.
However,
facile
efficient
regulation
of
the
multiple
emission
properties
chiral
systems
has
remained
a
challenge
due
to
scarcity
suitable
complexity
systems.
Herein,
CPL
platform
is
fabricated
by
helical
co‐assembly
an
aldehyde‐functionalized
fluorane
dye
(Rhodol‐CHO,
6′‐(diethylamino)‐3′‐hydroxy‐3‐oxo‐3H‐spiro[isobenzofuran‐1,9′‐xanthene]‐4′‐carbaldehyde)
liquid
crystals,
which
can
efficiently
combine
stimuli‐responsive
characteristics
high
activity.
By
introducing
acid,
base,
compounds
containing
primary
amino
(─NH
2
)
groups,
property
system
be
easily
modified.
The
obtained
apparent
asymmetry,
with
g
lum
values
reaching
0.54–0.75).
Further,
these
modules
are
successfully
applied
multi‐mode
encryption,
highlighting
their
practical
utility.
Therefore,
this
study
presents
novel
strategy
for
developing
diverse
behaviors
based
on
simple‐designed
platform,
advancing
further
materials.
