Advanced Functional Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Авг. 29, 2024
Abstract
This
work
utilizes
the
self‐assembled
cellulose
nanocrystals
(CNCs)
as
host
chiral
template
and
fabricates
a
circularly
polarized
luminescence
(CPL)
film.
By
manipulating
photonic
bandgap,
synthesized
film
integrates
strong
CPL
signal
superior
mechanical
flexibility.
Without
losing
activity,
ultimate
strain
of
19%
has
exceeded
most
CNC‐based
luminescent
assemblies,
which
enables
them
candidates
in
optical
sensor
wearable
device.
Meanwhile,
humidity‐stimulus
response,
with
dissymmetry
factor
(
g
lum
)
close
to
0.51.
responsive
process
is
reversible
properties
can
recover
upon
drying.
Next,
by
pathway,
this
achieves
on‐demand
direction
control
meets
considerable
intensity
reversed
signals
:
‐0.35),
avoiding
structure
disruption
random
under
external
stimuli,
opens
new
insight
into
regulations.
Furthermore,
combines
situ
growth
strategy
first
synthesizes
dynamic‐switchable
dual‐direction
Optics
both
directions
be
inverted
simultaneously
exchanging
sequences.
Finally,
multimodal
optics,
excellent
stability,
green
manufacturing
make
welcome
advanced
anti‐counterfeit
areas,
features
lossless
long‐time
useful.
Angewandte Chemie International Edition,
Год журнала:
2023,
Номер
62(36)
Опубликована: Июль 18, 2023
Stimuli-responsive
circularly
polarized
luminescence
(CPL)
materials
are
ideal
for
information
anti-countering
applications,
but
the
best-performing
have
not
yet
been
identified.
This
work
presents
enantiomorphic
hybrid
antimony
halides
R-(C5
H12
NO)2
SbCl5
(1)
and
S-(C5
(2)
showing
mirror-imaged
CPL
activity
with
a
dissymmetry
factor
of
1.2×10-3
.
Interestingly,
DMF-induced
structural
transformation
is
realized
to
obtain
non-emissive
⋅
DMF
(3)
(4)
upon
exposure
vapor.
The
process
reversed
heating.
DFT
calculations
showed
that
DMF-induced-quenched-luminescence
attributed
intersection
ground
excited
state
curves
on
configuration
coordinates.
Unexpectedly,
nanocrystals
chiral
1
2
were
prepared
indicate
excellent
solution
performance.
reversible
PL
switching
gives
system
applications
in
technology,
anti-counterfeiting,
encryption-decryption,
logic
gates.
Angewandte Chemie International Edition,
Год журнала:
2024,
Номер
63(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.
Light Science & Applications,
Год журнала:
2024,
Номер
13(1)
Опубликована: Июнь 14, 2024
Abstract
Polymer-based
circularly
polarized
luminescence
(CPL)
materials
with
the
advantage
of
diversified
structure,
easy
fabrication,
high
thermal
stability,
and
tunable
properties
have
garnered
considerable
attention.
However,
adequate
precise
tuning
over
CPL
in
polymer-based
remains
challenging
due
to
difficulty
regulating
chiral
structures.
Herein,
visualized
full-color
is
achieved
by
doping
red,
green,
blue
quantum
dots
(QDs)
into
reconfigurable
phase
liquid
crystal
elastomers
(BPLCEs).
In
contrast
signal
observed
cholesteric
(CLCEs),
3D
cubic
superstructure
BPLCEs
induces
an
opposite
signal.
Notably,
this
effect
entirely
independent
photonic
bandgaps
(PBGs)
results
a
g
lum
value,
even
without
matching
between
PBGs
emission
bands
QDs.
Meanwhile,
lattice
structure
can
be
reversibly
switched
via
mechanical
stretching
force,
inducing
on-off
switching
signals,
these
variations
further
fixed
using
dynamic
disulfide
bonds
BPLCEs.
Moreover,
smart
systems
for
anti-counterfeiting
information
encryption
been
demonstrated,
suggesting
great
potential
BPLCEs-based
active
materials.
Advanced Materials,
Год журнала:
2024,
Номер
36(18)
Опубликована: Янв. 25, 2024
Abstract
Integrating
optically
active
components
into
chiral
photonic
cellulose
to
fabricate
circularly
polarized
luminescent
materials
has
transformative
potential
in
disease
detection,
asymmetric
reactions,
and
anticounterfeiting
techniques.
However,
the
lack
of
cellulose‐based
left‐handed
light
(L‐CPL)
emissions
hampers
progress
these
functionalizations.
Here,
this
work
proposes
an
unprecedented
strategy:
incorporating
a
nematic
organization
hydroxypropyl
with
robust
aggregation‐induced
emission
luminogens
generate
intense
L‐CPL
emission.
By
utilizing
N
,
‐dimethylformamide
as
good
solvent
for
fluorescent
matrices,
produces
right‐handed
structure
film
uniform
appearance
reflective
states.
Remarkably,
system
integrates
high
factor
(0.51)
impressive
quantum
yield
(55.8%)
one
fascinating
composite.
More
meaningfully,
approach
is
versatile,
allowing
incorporation
luminogen
derivatives
emitting
multicolored
L‐CPL.
These
films
possess
exceptional
mechanical
flexibility
(toughness
up
0.9
MJ
m
−3
)
structural
stability
even
under
harsh
environmental
exposures,
making
them
promising
fabrication
various
products.
Additionally,
can
be
cast
on
fabrics
reveal
multilevel
durable
capabilities
or
used
source
induce
enantioselective
photopolymerization,
thereby
offering
significant
diverse
practical
applications.
Abstract
Bio‐enabled
and
bio‐mimetic
nanomaterials
represent
functional
materials,
which
use
bio‐derived
materials
synthetic
components
to
bring
the
better
of
two,
natural
synthetic,
worlds.
Prospective
broad
applications
are
flexibility
mechanical
strength
lightweight
structures,
adaptive
photonic
functions
chiroptical
activity,
ambient
processing
sustainability,
potential
scalability
along
with
sensing/communication
abilities.
Here,
we
summarize
recent
results
on
relevant
responsive
behavior
under
stresses,
magnetic
field,
changing
chemical
environment.
We
focus
achievements
trends
in
tuning
optical
materials'
properties
such
as
light
scattering,
absorption
reflection,
emission,
structural
colors,
birefringence,
linear
circular
polarization
for
prospective
biosensing,
communication,
encoding,
fast
actuation,
biomedical
fields,
tunable
appearance.
Angewandte Chemie International Edition,
Год журнала:
2024,
Номер
63(36)
Опубликована: Июнь 10, 2024
The
fabrication
of
materials
that
can
switch
between
circularly
polarized
luminescence
(CPL)
signals
is
both
essential
and
challenging.
Here,
two
new
halogen-bonded
fluorescent
molecular
photoswitches,
namely,
HB-switch
1
2,
containing
α-cyano-substituted
diarylethene
compounds
with
different
end
groups
were
developed.
Upon
exposure
to
specific
UV
or
visible
light
wavelengths,
they
exhibited
controllable
reversible
Z/E
photoisomerization.
When
these
switches
integrated
into
blue-phase
liquid
crystals
(BPLCs),
the
temperature
range
BP
significantly
expanded.
Notably,
system
incorporating
exclusively
achieved
polarization
inversion
CPL
under
irradiation
UV/Visible
during
cooling/heating.
photo/thermal
dual-response
behavior
be
attributed
phase
transition
from
a
high-symmetry
3D
Icubic
lattice
low-symmetry
1D
helical
superstructure
induced
by
photoisomerization
changes.
This
study
underscores
significance
employing
halogen-bond
assembly
strategies
design
switchable
signals,
opening
possibilities
for
CPL-active
systems.
Abstract
Chirality,
as
one
of
the
most
striking
characteristics,
exists
at
various
scales
in
nature.
Originating
from
interactions
host
and
guest
molecules,
supramolecular
chirality
possesses
huge
potential
design
functional
materials.
Here,
an
overview
recent
progress
structure
designs
functions
chiral
materials
is
present.
First,
three
routes
are
summarized.
Compared
with
template‐induced
chemical
synthesis
strategies
that
depend
on
accurate
molecular
identification,
twisted‐assembly
technique
creates
through
ordered
stacking
nanowire
or
films.
Next,
inversion
amplification
reviewed
to
explain
transfer
level
macroscopic
scale,
where
available
external
stimuli
also
given.
Lastly,
owing
optical
activity
characteristics
layer‐by‐layer
structure,
display
excellent
performances,
including
smart
response,
shape‐memorization,
superior
mechanical
performance,
applications
biomedical
fields.
To
sum
up,
this
work
provides
a
systematic
review
helical
assemblies,
design,
systems.
