Advanced Optical Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Dec. 26, 2024
Abstract
Circularly
polarized
luminescence
(CPL)
in
purely
organic
materials
is
limited
by
the
almost
exclusively
electric
nature
of
electronic
transitions.
Resolving
this
problem
possible
through
structuring
at
dimensions
comparable
to
wavelength
visible
light.
Here,
study
explores
use
thin
films
made
chiral
nanotubes
for
enhanced
induction
CPL.
The
first
performs
multi‐scale
modeling
chiroptical
properties
using
T‐matrix
method.
Combined
with
measurements,
including
Mueller
matrix
polarimetry,
discusses
within
frames
their
structuring.
When
embedding
aggregation‐induced
fluorogens
(AIEgens)
into
structured
films,
composites
featured
gigantic
g
lum
factors
reaching
≈10
−1
are
obtained.
Importantly,
a
series
control
experiments
performed
exclude
common
parasitic
effects
that
can
lead
apparent
CPL
signals.
composite
and
AIEgens
enable
visual
discrimination
handedness
both
absorption
emission
realms.
uncovered
multi‐mode
enhancement
directs
future
endeavors
anticounterfeiting
or
holography
applications.
Advanced Optical Materials,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 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.
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.
Chemical Communications,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Jan. 1, 2024
Twelve
liquid
crystalline
polymer
network
films
were
fabricated
through
photopolymerization
of
cholesteric
liquid-crystalline
mixtures
containing
two
aggregation-induced
emissive-active
luminogens.
The
exhibit
multicolour
and
white
circularly
polarized
luminescence
with
dissymmetry
factors
up
to
0.85
fluorescence
quantum
yields
90%.
Advanced Optical Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Oct. 17, 2024
Abstract
Circularly
polarized
luminescence
(CPL)
of
chiral
luminescent
materials
has
gained
increasing
attention
because
their
significant
applications
in
3D
displays,
optoelectronics,
anti‐counterfeiting,
and
encryption.
A
strongly
emissive
dye
BAcT
is
synthesized
using
(
R
)‐BINOL
as
the
source
a
tetraphenylethene
group
fluorophore.
Upon
addition
to
nematic
liquid
crystal,
left‐handed
cholesteric
structure
induced.
Different
concentrations
/
S
5011
co‐dopants
are
added
prepare
series
structurally
colored
crystal
polymer
network
(CLCN)
films.
CPL
bands
detected
for
these
green
CLCN
films,
relatively
high
|
g
lum
values
(up
0.48)
obtained.
Furthermore,
fluorescent
PMMA‐BAcT
layer
prepared
by
embedding
PMMA
matrix
stacked
with
construct
composite
film.
Because
filtering
effect
film,
value
up
1.41
successfully
achieved.
Colorful
patterns
prepared,
clear
pictures
observed
both
reflective
modes,
contributing
optical
anti‐counterfeiting
enhanced
security.
This
work
not
only
provides
deeper
understanding
CPL,
but
also
establishes
practical
strategy
colorful
inkjet
printing
technology.
