Liquid Crystals,
Год журнала:
2024,
Номер
unknown, С. 1 - 9
Опубликована: Ноя. 21, 2024
The
optical
characteristics
and
surface
area
of
quantum
dots
(QDs)
render
them
a
compelling
platform
for
the
development
composite
materials
based
on
fluorescence
resonance
energy
transfer
(FRET).
A
novel
luminescent
liquid
crystal
nanocomposite
(CBphCM-CdTe)
has
been
successfully
prepared
through
ionic
self-assembly
route
using
imidazolium
salt
(CBphCM)
CdTe
QDs.
DSC
POM
analyses
confirm
that
CBphCM-CdTe
undergoes
smectic
C
phases,
but
its
temperature
range
is
narrower
compared
to
pure
CBphCM.
Concurrently,
exhibits
excellent
characteristics.
Increasing
serves
as
trigger
between
QDs
CBphCM,
wherein
quenched,
while
intensity
CBphCM
increases
with
rising
temperature.
strong
correlation
exists
within
range.
Such
thermochromic
are
anticipated
facilitate
innovative
in
dynamic
thermo-optical
sensing,
thereby
enabling
enhanced
control
over
light
manipulation
stimuli-responsive
devices.
Advanced Optical Materials,
Год журнала:
2024,
Номер
12(15)
Опубликована: Фев. 5, 2024
Abstract
Chiral
self‐assembly
has
often
been
found
to
be
an
efficient
strategy
for
the
development
of
high‐performance
circularly
polarized
luminescent
(CPL)
materials,
through
regulation
ordered
helical
superstructure
blocks
in
liquid
crystal
media.
Here,
design
and
synthesis
two
pairs
axially
chiral
emitters
(BBXT‐3‐Br
BOHXT‐3‐Br)
are
reported
based
on
bromoxanthone.
And
self‐assembled
polymer
(LCP)
framework
(PRM257)
is
demonstrated
by
mixing
with
monomer
(RM257)
thermal
annealing
photoinitiated
polymerization.
Both
BBXT‐3‐Br@PRM257
BOHXT‐3‐Br@PRM257
exhibited
excellent
room
temperature
phosphorescence
(RTP)
properties.
In
addition,
enantiomers
showed
afterglow
average
lifetime
(
τ
)
162.41
ms
emitted
blue
CPL
λ
em
=
450
nm,
Φ
FL
1.3%,
|
g
0.071),
although
weak
RTP
(CP‐RTP)
observed.
Interestingly,
a
less
conjugated
system
emits
red
98.83
ms)
also
intense
CP‐RTP
612
Phos
0.45%,
0.057).
ACS Applied Materials & Interfaces,
Год журнала:
2024,
Номер
16(7), С. 9323 - 9332
Опубликована: Фев. 9, 2024
Chiral
luminescent
liquid
crystals
have
attracted
widespread
attention
from
researchers
due
to
their
unique
advantages
in
constructing
circularly
polarized
(CPL)
materials
with
large
asymmetry
factor
(glum)
values.
However,
how
effectively
prepare
nondoped
CPL
chiral
remains
a
challenge.
In
this
article,
we
developed
an
effective
and
universal
method
crystal
materials.
To
achieve
our
strategy,
copolymerized
monomer
M0Mt
α-cyanostilbene-based
monomers
MmPVPCN
(m
=
6,
8,
10)
bearing
different
flexible
spacer
lengths
obtain
series
of
copolymers
poly(MmPVPCN(x)-co-M0Mt(y)).
Under
the
induction
component,
α-cyanostilbene
component
assembles
form
crystals.
Meanwhile,
also
exhibits
aggregation-induced
emission
enhancement
characteristics.
Therefore,
help
selective
reflection
effect
crystals,
copolymer
films
can
emit
efficient
CPL.
For
poly(M8PVPCN(0.85)-co-M0Mt(0.15)),
glum
solid
luminescence
quantum
yield
−2.61
×
10–2
25.04%,
respectively.
addition,
by
altering
chemical
structure
copolymers,
phase
be
controlled,
thereby
regulating
properties.
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.
ACS Materials Letters,
Год журнала:
2024,
Номер
6(7), С. 2957 - 2963
Опубликована: Июнь 12, 2024
Enhancing
the
dissymmetry
factor
(glum)
is
crucial
for
circularly
polarized
luminescence
(CPL)
applications.
Herein,
we
present
an
innovative
strategy
achieving
ultrastrong
|glum|
of
1.73.
This
accomplished
through
synergistic
effect
coassembly
CPL-emitting
ternary
liquid
crystal
(T-N*-LC,
=
0.47)
and
selective
reflection
(λ
590
nm)
polymer
cholesteric
(CLC)
within
a
composite
system.
Unlike
mismatched
chirality
combination
(|glum|
1.42,
ΔFL
57%),
matched
demonstrates
CPL
signal
with
1.73
low
50%
when
direction
T-N*-LC
agrees
CLC
film's
chirality.
Furthermore,
alter
matching
degree
system
by
applying
direct-current
(DC)
electric
field
to
realize
switch.
study
paves
way
developing
outstanding
CPL-active
display
materials
amplification
glum.
Advanced Optical Materials,
Год журнала:
2024,
Номер
12(16)
Опубликована: Фев. 21, 2024
Abstract
The
high
planarity
and
heavy‐atom
effect
of
Pt(II)
metallomesogens
promote
their
stacking
in
the
aggregated
state
highly
efficient
phosphorescence.
This
makes
them
promising
candidate
materials
for
circularly
polarized
phosphorescence
(CPP)
triggered
by
using
a
chiral
co‐assembly
strategy.
In
this
paper,
nematic
phase,
achiral
robot‐like
metallomesogen
(
TFPt
)
is
synthesized,
which
combines
two
anchored
binaphthyl
inducers
R/S
1
or
2
to
construct
cholesteric
liquid
crystal
(N*‐LC)
co‐assemblies
R
/
S
1)
n
‐(TFPt)
1‐n
2)
via
intermolecular
interactions.
resultant
N*‐LC
0.03
0.97
exhibit
strongest
CPP
emission
with
dissymmetry
factors
g
em
up
0.18
0.27,
respectively,
stemming
from
formation
regular
helical
nanofibers
on
spin‐coated
films
process
after
thermal
annealing
at
165
°C.
ACS Applied Materials & Interfaces,
Год журнала:
2023,
Номер
15(42), С. 49701 - 49711
Опубликована: Окт. 17, 2023
Room-temperature
phosphorescent
(RTP)
liquid
crystal
materials
have
garnered
considerable
attention
because
of
their
significant
applications
in
organic
light
emitting
diodes,
polarized
materials,
and
so
forth.
How
to
efficiently
synthesize
pure
RTP
crystals
regulate
performance
is
great
significance.
In
this
article,
we
propose
a
simple
feasible
method
manipulate
properties
through
copolymerization.
We
constructed
copolymers
by
copolymerizing
monomer
bearing
biphenyl
mesogen
with
dibenzofuran
chromophore.
All
the
synthesized
show
property
introduction
mesogen.
Meanwhile,
changing
composition
copolymers,
it
possible
performance,
including
luminescence
color
lifetime.
As
content
PMDFM0C
component
increases,
phosphorescence
lifetime
gradually
increases.
For
poly(MDFM0C(0.46)-co-MBi18C(0.54)),
can
reach
463.0
ms.
Moreover,
changes
copolymer
composition,
which
induce
variable
room-temperature
phosphorescence.
addition,
when
oriented,
films
emit
linearly
fluorescence
The
dichroic
ratio
polarization
values
oriented
poly(MDFM0C(0.46)-co-MBi18C(0.54))
film
are
3.33
0.50,
respectively.
Abstract
Circularly
polarized
luminescence
(CPL)
materials
are
highly
demanded
due
to
their
great
potential
in
optoelectronic
and
chiroptical
elements.
However,
the
preparation
of
CPL
films
with
high
dissymmetry
factors
(g
lum
)
remains
a
formidable
task,
which
impedes
practical
application
film‐based
devices.
Herein,
facile
strategy
prepare
solid
film
g
through
exogenous
chiral
induction
amplification
liquid
crystal
polymers
is
proposed.
Amplification
reversion
appear
when
annealed
at
nematic
crystalline
temperature
maximal
up
0.30
enhancement
selective
reflection.
Thermal
annealing
treatment
different
states
facilitates
formation
phase
adjusts
circularly
emission.
This
work
not
only
provides
straightforward
versatile
platform
construct
organic
capable
exhibiting
strong
emission
but
also
helpful
understanding
exact
mechanism
for
performance.
Molecules,
Год журнала:
2025,
Номер
30(2), С. 390 - 390
Опубликована: Янв. 18, 2025
Developing
a
new
type
of
circularly
polarized
luminescent
active
small
organic
molecule
that
combines
high
fluorescence
quantum
yield
and
luminescence
dissymmetric
factor
in
both
solution
solid
state
is
highly
challenging
but
promising.
In
this
context,
we
designed
synthesized
unique
triarylborane-based
[2.2]paracyclophane
derivative,
m-BPhANPh2-Cp,
which
an
electron-accepting
[(2-dimesitylboryl)phenyl]ethynyl
group
electron-donating
N,N-diphenylamino
are
introduced
into
two
different
benzene
rings
[2.2]paracyclophane.
Owing
to
the
electronic
effect
these
substituents,
compound
can
display
charge-transfer
emission
with
large
Stokes
shifts
(∆υ
=
4.23
−
8.20
×
103
cm−1)
fair
yields
(ΦF
0.15
0.37)
solutions.
addition,
emit
strong
blue
even
much
higher
than
up
0.64
powder
spin-coated
film).
Moreover,
enantiomeric
forms
m-BPhANPh2-Cp
show
CPL
signals
dilute
|glum|s
9.6
10−3
5.4
10−3,
respectively.
Thus,
it
possible
achieve
tunable
from
yellow
BCPLs
ranging
56.7
26.6
M−1
cm−1
intense
combing
ΦF
|glum|
state.