ABSTRACT
Circularly
polarized
luminescent
materials
find
extensive
applications
in
3D
displays,
information
encryption,
and
photoinduced
supramolecular
chirality.
However,
controlling
the
handedness
of
circularly
luminescence
remains
a
significant
challenge
advancing
optical
technologies.
In
this
study,
we
present
Janus
light
emitter
comprising
fluorescent
film
combined
with
chiral
nematic
cellulose
switchable
The
achieves
maximum
dissymmetry
factors
(0.28
−0.65)
through
mode
switching.
addition,
show
emitter's
versatility
inducing
helices
azobenzene
polymers
varying
polar
groups,
resulting
signals.
Importantly,
chirality
these
can
be
switched
by
altering
emitter.
These
results
are
expected
to
facilitate
efficient
design
photoinduction
devices.
Journal of Materials Chemistry C,
Год журнала:
2024,
Номер
12(23), С. 8287 - 8295
Опубликована: Янв. 1, 2024
Four
pairs
of
chiral
Ag
6
L
nanoclusters,
synthesized
using
ligand
engineering
with
thiazithione
and
oxazinthione,
exhibit
enhanced
luminescence
quantum
yield
attributed
to
S⋯S
interactions
demonstrate
supramolecular
chirality
inversion
regulated
by
peripheral
methyl
phenyl
groups.
Macromolecules,
Год журнала:
2024,
Номер
57(9), С. 4567 - 4575
Опубликована: Май 2, 2024
The
design
of
excellent
circularly
polarized
luminescence
(CPL)
materials
with
a
large
dissymmetry
factor
(glum)
remains
great
challenge.
In
this
paper,
we
chose
two
achiral
conjugated
pyrene-based
main-chain
polymers
(BP-1
and
BP-2)
different
substitution
positions
(1,6-positions
the
pyrene
rings
for
BP-1
2,7-positions
chiral
binaphthyl-based
inducer
(S/R-D)
bridged
alkyl
chain
to
construct
coassemblies
through
an
intermolecular
chirality
induction
mechanism.
Interestingly,
after
thermal
annealing
treatment,
resulting
S/R-D-BP-2
could
emit
inverted
amplified
CPL
signals
compared
S/R-D-BP-1.
Most
significantly,
maximum
|glum|
value
(S/R-D)0.2-(BP-2)0.8
in
spin-coated
film
was
up
0.71
(λem
=
428
nm,
QY
44.8%)
at
220
nm
thickness,
which
about
6-fold
that
(S/R-D)0.1-(BP-1)0.9
(|glum|
0.12,
λem
451
37.6%).
glum
due
formation
regular
ordered
helical
nanofibers
strong
π–π
stacking
interactions.
This
work
provides
creative
approach
tune
emission
amplification
behaviors
by
coassembly
from
polymers.
Angewandte Chemie,
Год журнала:
2024,
Номер
136(27)
Опубликована: Май 4, 2024
Abstract
Circularly
polarized
luminescence
(CPL)‐active
materials
are
increasingly
recognized
for
their
potential
applications
such
as
3D
imaging,
data
storage,
and
optoelectronic
devices.
Typically,
CPL
have
required
high‐energy
(HE)
photons
excitation
to
emit
low‐energy
(LE)
circularly
light,
a
process
known
downshifting
(DSCPL).
However,
the
emergence
of
upconverted
(UCCPL),
where
absorption
multi
LE
results
in
emission
single
HE
photon
with
circular
polarization,
has
recently
attracted
considerable
attention.
This
minireview
highlights
intricate
relationship
between
upconversion
phenomena.
During
upconversion,
dissymmetry
factor
(
g
lum
)
value
can
be
improved
certain
systems.
Additionally,
integration
both
upconversion‐downshifting‐synergistic
systems
offers
avenues
dual‐excitation
or
dual‐emission
functionalities.
More
detail,
emerging
UCCPL
based
on
various
mechanisms
synergy
DSCPL
introduced.
several
examples
that
demonstrate
presented
highlight
future
opportunities.
Angewandte Chemie,
Год журнала:
2024,
Номер
136(41)
Опубликована: Июль 19, 2024
Abstract
The
introduction
of
precise
pore
defects
into
nanocarbon
structures
results
in
the
emergence
distinct
physicochemical
characteristics.
However,
there
is
a
lack
research
on
non‐planar
chiral
nanographene
involving
defects.
Herein,
we
have
developed
two
analogues
to
π‐extended
pentadecabenzo[9]helicene
(
EP9H
)
containing
embedded
Each
molecules,
namely
extended
dodecabenzo[7]helicene
ED7H
;
1
or
nonabenzo[5]helicene
EN5H
2
),
exhibits
dual‐state
emission.
Significantly,
value
|
g
lum
exceptionally
high
at
1.41×10
−2
solution
and
B
CPL
as
254
M
−1
cm
.
In
PMMA
film,
8.56×10
−3
,
powder
it
5.00×10
This
study
demonstrates
that
molecules
with
exhibit
emission
properties
while
maintaining
quite
good
luminescence
properties.
It
was
distinguished
from
aggregation‐caused
quenching
(ACQ)
effect
corresponding
without
defect.
Incorporating
also
simplifies
synthesis
process
enhances
solubility
resulting
product.
These
findings
suggest
can
be
viable
approach
improve
molecules.
ABSTRACT
Circularly
polarized
luminescent
materials
find
extensive
applications
in
3D
displays,
information
encryption,
and
photoinduced
supramolecular
chirality.
However,
controlling
the
handedness
of
circularly
luminescence
remains
a
significant
challenge
advancing
optical
technologies.
In
this
study,
we
present
Janus
light
emitter
comprising
fluorescent
film
combined
with
chiral
nematic
cellulose
switchable
The
achieves
maximum
dissymmetry
factors
(0.28
−0.65)
through
mode
switching.
addition,
show
emitter's
versatility
inducing
helices
azobenzene
polymers
varying
polar
groups,
resulting
signals.
Importantly,
chirality
these
can
be
switched
by
altering
emitter.
These
results
are
expected
to
facilitate
efficient
design
photoinduction
devices.
