Chemistry - An Asian Journal,
Год журнала:
2024,
Номер
unknown
Опубликована: Ноя. 6, 2024
Abstract
Chiral
luminescent
liquid
crystal
(LC)
materials
with
switchable
circularly
polarized
luminescence
(CPL)
signals
have
received
extensive
attention,
in
which
the
use
of
light
stimulation
to
achieve
different
CPL
states
is
great
significance.
However,
there
are
very
few
reports
on
generation
and
regulation
enabled
by
blue
phase
LC
(BPLC).
Herein,
achieving
signal
inversion
based
transition
induced
light/temperature
a
BPLC
system
wide
room‐temperature
window
reported.
A
binaphthalene
azo‐based
chiral
photoswitch
(
S
)‐switch
3
high
helical
twisted
power
(HTP)
large
HTP
variation
synthesized,
BP
room
temperature
range
further
fabricated
doping
fluorescence
molecule
into
bulk
LC.
By
regulating
amount
,
from
cholesteric
(Ch)
at
observed
upon
365
nm
UV
irradiation
or
during
cooling
process,
polarization
correspondingly
found
due
mechanisms
CLC.
This
study
provides
new
strategy
for
flexible
system.
Advanced Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 26, 2025
Abstract
Blue
phase
liquid
crystal
(BPLC)
lasers
exhibit
exceptional
optical
quality
and
tunability
to
external
stimuli,
holding
significant
promise
for
innovative
developments
in
the
field
of
flexible
optoelectronics.
However,
there
remain
challenges
BPLC
elastomer
(BPLCE)
maintaining
good
stability
during
stretching
varying
temperature
conditions.
In
this
work,
a
stretchable
laser
is
developed
based
on
well‐designed
BPLCE
with
combination
partially
fully
crosslinked
networks,
which
can
output
single‐peak
under
small
deformation
(44.429
nm
lasing
shift
at
32%
strain)
broad‐temperature
range
(from
−20
100
°C).
The
superior
performance
be
attributed
nonlinear
3D
asymmetric
exhibited
by
BPI
lattice
stretching,
particularly
low
rates
below
40%
strain,
effectively
maintains
body‐centered
cubic
structure
(with
maximum
strain
up
220%).
Moreover,
exhibits
excellent
thermal
over
from
−180
70
°C
stopband
less
than
±10
nm.
As
proof‐of‐concept,
application
morphology
sensing
mechanical
perception
demonstrated,
paves
way
potential
applications
Advanced Functional Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Фев. 12, 2025
Abstract
Blue
phase
liquid
crystal
(BPLC)
dynamic
patterns
have
attracted
wide
attention
for
promising
applications
in
optical
information
manipulation
and
visualization
sensing,
owing
to
unique
3D
chiral
helix
superstructure
adjustable
bright/abundant
colors
response
extra
fields.
Inkjet
printing
has
become
an
efficient
approach
achieving
programmable
BPLC
patterns.
However,
it
remains
a
challenge
achieve
independent
“on/off”
control
of
regional
using
the
same
ink
due
unrevealed
temperature‐time‐dependent
color
change
behavior
determined
by
different
inks.
Herein,
comprehensive
understanding
reflective
bandgap
shift
law
versus
temperature/time
is
established
investigating
diffusion
kinetics
multiple
inks
(5CB,
6CB,
8CB)
hydrophobically
modified
blue‐phase
polymer
templates.
The
three
induce
redshift
followed
blueshift
color/reflectance
wavelengths,
but
triggering
times
differ
significantly
at
temperature,
which
attributed
inks'
transition
characteristics,
fluid
properties,
interaction
with
network.
Dynamic
multi‐color
selective
region
are
successfully
fabricated
based
on
time‐temperature
controlled
multi‐ink
technique
displaying
time‐series
multi‐level
encryption
(including
“growing
apple
tree”
“nested
QR
codes”).
This
study
provides
important
insights
into
design
fabrication
advanced
devices
Advanced Optical Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 10, 2025
Abstract
Achieving
high
circularly
polarized
electroluminescence
(CP‐EL)
performance
in
organic
light‐emitting
diodes
(OLEDs)
remains
a
significant
challenge.
In
this
study,
chiral
nematic
liquid
crystal
polymers
(LCPs)
are
co‐assembled
as
fluorescent
materials
by
doping
1
wt%
binaphthyl‐based
R/S
‐D
inducers
into
LCP
(
P‐PyP
),
displaying
blue
luminescence
(CPL)
signals
(|
g
lum
|
=
0.025,
λ
em
470
nm,
Φ
FL
37%)
after
thermal
annealing
at
140
°C.
Notably,
the
resulting
films
can
serve
emitting
layer
(EML)
non‐doped
OLEDs,
and
exhibit
good
CP‐EL
emissions
EL
−0.019/+0.015,
484
nm).
This
work
demonstrates
pathway
for
through
co‐assembly
of
LCPs.
Advanced Optical Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Окт. 9, 2024
Abstract
Inspired
by
the
color‐changing
abilities
of
natural
organisms,
this
research
focuses
on
design
and
fabrication
mechanochromic
liquid
crystal
photonic
thin
films
with
periodic
self‐assembly
structures.
Benefiting
from
its
unique
3D
self‐assembled
structure
a
body‐centered
cubic
lattice,
BP
I
film
exhibits
excellent
mechanical
properties,
characterized
superior
elasticity
toughness
due
to
presence
rigid
flexible
microdomains
suitable
dislocation
line
volumes.
As
strain
increases,
structural
color
demonstrates
repeatable
rapid
shift
red
blue,
covering
entire
visible
light
spectrum
high
reflectivity.
The
incorporation
fluorescent
molecules
further
enhances
properties
endowing
circularly
polarized
luminescence
under
UV
irradiation.
Utilizing
different
dyes
as
inks,
arbitrary
patterned
writing
can
be
performed
BPI
film,
enabling
specific
information
hiding
encryption.
prepared
label
environmental
stability,
presenting
promising
applications
in
storage,
anti‐counterfeiting,
displays.
study
may
contribute
deeper
understanding
relationship
between
microstructure,
deformation,
optical
potentially
advancing
development
innovative
responsive
materials
multifunctional
devices.
Advanced Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Ноя. 2, 2024
Chiral
liquid
crystal
supramolecular
assembly
provides
an
ideal
strategy
for
constructing
excellent
circularly
polarized
luminescence
(CPL)
materials.
However,
the
chirality
transfer
in
chiral
crystals
normally
occurs
at
two
levels
from
configurational
to
phase
chirality.
The
more
precise
and
of
transmission
are
fascinating
but
remain
challenging.
present
work
reports
first
success
three-level
amplification
configurationally
point
small
molecules
conformationally
helical
polymers
finally
cholesteric
composed
nonfluorescent
(P46)
nematic
crystals.
Noticeably,
twisting
power
P46
is
five-fold
larger
than
its
monomer.
Full-color
white
CPL
with
maximum
dissymmetry
factor
up
1.54
photoluminescence
quantum
yield
63.8%
realized
utilizing
combined
selective
reflection
mechanism.
Also
significantly,
electrically
stimuli-responsive
switching
device
as
well
anti-counterfeiting
security,
information
encryption,
logic
gate
applications
developed.
This
study
deepens
understanding
across
different
hierarchical
levels.
Journal of the American Chemical Society,
Год журнала:
2024,
Номер
unknown
Опубликована: Ноя. 28, 2024
Constructing
circularly
polarized
luminescence
(CPL)
materials
that
exhibit
dynamic
handedness
inversion
and
emissive
color
modulation
for
multimodal
information
encryption
presents
both
a
significant
challenge
compelling
opportunity.
Here,
we
have
developed
pyridinethiazole
acrylonitrile-cholesterol
derivative
(Z-PTC)
exhibits
wavelength-dependent
photoisomerization
photocyclization,
enabling
in
supramolecular
assemblies
with
decent
CPL
activity.
Coordination
Ag
Advanced Optical Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 17, 2025
Abstract
Liquid
crystal
(LC)
materials,
with
their
supramolecular
self‐assembly
nanostructures
and
stimulus‐responsive
properties,
offer
inherent
advantages
in
the
development
of
advanced
intelligent
functional
materials.
Among
various
LC
phase,
blue
phase
liquid
crystals
(BPs)
are
regarded
as
promising
candidates
for
photonic
due
to
unique
3D
periodic
capability
selectively
reflect
circularly
polarized
light
within
visible
spectrum.
Over
past
decades,
methodologies
developed
synthesize
BP
materials
superior
thermal
stability,
high‐quality
optical
properties
excellent
stimulus‐responsibility,
yielding
significant
research
outcomes
design
application
visual
devices.
Herein,
this
review
summarizes
recent
advancements
BPLCs.
It
comprehensively
covers
structural
characteristics
preparation
methods
crystals,
detailing
findings
optical,
electrical,
mechanical,
humidity‐responsive
well
pivotal
applications
sensors,
devices,
stimulus
response,
anti‐counterfeiting
Finally,
challenges
prospective
directions
novel
soft
matter
material
discussed.
is
anticipated
that
will
provide
valuable
insights
scientists
engineers
interdisciplinary
fields,
including
science,
photonics,
chemistry,
physics,
facilitating
fabrication
ACS Applied Polymer Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Март 20, 2025
Materials
with
circularly
polarized
luminescence
have
garnered
significant
attention
due
to
their
applications
in
anticounterfeiting
and
displays.
In
this
work,
we
synthesized
a
pair
of
AIEgens,
designated
as
D-
L-TA-TPE,
dopants
by
utilizing
tartaric
acid
tetraphenylethylene.
These
AIEgens
were
incorporated
into
nematic
liquid
crystal
polymer
network
films.
The
resulting
films
exhibited
|glum|
values
about
7.0
×
10–3,
which
can
be
attributed
the
chiral
conformations
these
two
AIEgens.
For
AIEgen-doped
cholesteric
(CLCN)
films,
selective
Bragg
reflection
CLCN
reached
0.7.
When
composite
incorporating
both
fluorescent
layers
examined,
1.6.
value
increased
increasing
film
thickness.
patterns
prepared
using
photomask
or
through
screen
printing.
Based
on
handedness
CPL,
distinct
images
observed
left-
right-handed
circular
polarizers.
Therefore,
are
potentially
applied
for
decoration
anticounterfeiting.
