Angewandte Chemie International Edition,
Год журнала:
2024,
Номер
63(25)
Опубликована: Апрель 10, 2024
Abstract
Circularly
polarized
luminescence
(CPL)‐active
molecular
materials
have
drawn
increasing
attention
due
to
their
promising
applications
for
next‐generation
display
and
optoelectronic
technologies.
Currently,
it
is
challenging
obtain
CPL
with
both
large
dissymmetry
factor
(
g
lum
)
high
quantum
yield
Φ
).
A
pair
of
enantiomeric
N
C‐type
Pt(II)
complexes
L/D
)‐
1
modified
chiral
Leucine
methyl
ester
are
presented
herein.
Though
the
solutions
these
CPL‐inactive,
spin‐coated
thin
films
exhibit
giantly‐amplified
circularly
phosphorescences
|
0.53
at
560
nm
air
~50
%,
as
well
appealing
circular
dichroism
(CD)
signals
maximum
absorption
abs
0.37–0.43
480
nm.
This
superior
performance
benefits
from
hierarchical
formation
crystalline
fibrillar
networks
upon
spin
coating.
Comparative
studies
another
2
a
symmetric
C
coordination
mode
suggest
that
asymmetric
favorable
efficient
exciton
delocalization
amplify
performance.
Optical
in
CPL‐contrast
imaging
inducing
CP
light
generation
achiral
emitters
common
light‐emitting
diode
lamps
been
successfully
realized.
Angewandte Chemie International Edition,
Год журнала:
2023,
Номер
62(50)
Опубликована: Окт. 30, 2023
The
helical
twisting
tendency
of
liquid
crystals
(LCs)
is
generally
governed
by
the
inherent
configuration
chiral
emitter.
Here,
we
introduce
multistage
inversion
supramolecular
chirality
as
well
circularly
polarized
luminescence
(CPL)
manipulating
ratio
single
enantiomeric
emitters
(R-PCP)
to
LC
monomers
(5CB).
Increasing
content
R-PCP
from
1
wt
%
3
inverted
helix
LCs
left-handed
right-handed,
accompanying
a
CPL
sign
changed
positive
negative.
biaxiality
emitters,
steric
effect
chiral-chiral
and
chiral-achiral
interaction,
were
identified
reasons
for
sense
inversion.
Due
strong
power,
4
drove
photonic
band
gap
(PBG)
match
up
with
their
emission
range,
leading
an
again
high
dissymmetry
factor
(≈1.2).
Directly
adjusting
PBG
using
seldom
achieved
in
cholesteric
LCs.
On
this
basis,
achiral
sensitizer
PtTPBP
was
assembled
into
superstructure.
generation
triplet-triplet
annihilation-induced
upconverted
downshifting
opposite
rotation
system
tuning
position
PBG.
Angewandte Chemie International Edition,
Год журнала:
2023,
Номер
62(46)
Опубликована: Сен. 30, 2023
It
is
noteworthy
that
cholesteric
liquid
crystal
(CLC)
platforms
have
been
witnessed
in
high-performance
circularly
polarized
luminescence
(CPL)
behaviors
through
the
highly
organized
chiral
co-assembled
arrangement
of
achiral
dyes.
However,
most
CPL-active
design
strategies
are
closely
relative
to
helix
co-assembly
structure
CLC
rather
than
Herein,
we
developed
an
intriguing
regulation
strategy
for
materials.
They
were
regulated
using
orientational
order
parameter
(SF
)
dichroic
dyes
as
incisive
probe
degree
media.
The
I-shaped
phenothiazine
derivative
PHECN
dye
=0.30)
emitted
a
strong
CPL
signal
(|glum
|=0.47).
In
contrast,
T-shaped
(PHEBen)
=0.09)
showed
weak
circular
polarization
level
|=0.07)
at
similar
textures.
Most
interestingly,
this
kind
with
higher
SF
could
greatly
improve
contrast
ratio
(Δglum
=0.47)
and
emission
intensity
(ΔFL=46.0
%)
direct-current
electric
field
compared
PHEBen
=0.07
ΔFL=1.0
CLC.
This
work
demonstrates
induced
can
be
mediated
dye,
which
will
open
new
avenue
developing
excellent
display
Angewandte Chemie International Edition,
Год журнала:
2024,
Номер
63(25)
Опубликована: Апрель 10, 2024
Abstract
Circularly
polarized
luminescence
(CPL)‐active
molecular
materials
have
drawn
increasing
attention
due
to
their
promising
applications
for
next‐generation
display
and
optoelectronic
technologies.
Currently,
it
is
challenging
obtain
CPL
with
both
large
dissymmetry
factor
(
g
lum
)
high
quantum
yield
Φ
).
A
pair
of
enantiomeric
N
C‐type
Pt(II)
complexes
L/D
)‐
1
modified
chiral
Leucine
methyl
ester
are
presented
herein.
Though
the
solutions
these
CPL‐inactive,
spin‐coated
thin
films
exhibit
giantly‐amplified
circularly
phosphorescences
|
0.53
at
560
nm
air
~50
%,
as
well
appealing
circular
dichroism
(CD)
signals
maximum
absorption
abs
0.37–0.43
480
nm.
This
superior
performance
benefits
from
hierarchical
formation
crystalline
fibrillar
networks
upon
spin
coating.
Comparative
studies
another
2
a
symmetric
C
coordination
mode
suggest
that
asymmetric
favorable
efficient
exciton
delocalization
amplify
performance.
Optical
in
CPL‐contrast
imaging
inducing
CP
light
generation
achiral
emitters
common
light‐emitting
diode
lamps
been
successfully
realized.
