Advanced Materials,
Год журнала:
2023,
Номер
36(5)
Опубликована: Сен. 12, 2023
Chiral
B/N
embedded
multi-resonance
(MR)
emitters
open
a
new
paradigm
of
circularly
polarized
(CP)
organic
light-emitting
diodes
(OLEDs)
owing
to
their
unique
narrowband
spectra.
However,
pure-red
CP-MR
and
devices
remain
exclusive
in
literature.
Herein,
by
introducing
B-N
covalent
bond
lower
the
electron-withdrawing
ability
para-positioned
B-π-B
motif,
first
pair
double
hetero-[n]helicenes
(n
=
6
7)
emitter
peaking
617
nm
with
small
full-width
at
half-maximum
38
high
photoluminescence
quantum
yield
≈100%
toluene
is
developed.
The
intense
mirror-image
CP
light
produced
enantiomers
characterized
dissymmetry
factors
(g
ACS Nano,
Год журнала:
2022,
Номер
16(2), С. 3173 - 3181
Опубликована: Фев. 10, 2022
Chiral
supramolecular
assembly
can
provide
a
powerful
strategy
for
developing
circularly
polarized
luminescence
(CPL)-active
materials
by
forming
helices
or
superhelices
into
single
multiple
components.
Herein,
we
chose
three
achiral
liquid
crystal
polymers
(LC-P1/P2/P3)
and
chiral
binaphthyl-based
inducers
(R/S-M)
with
anchored
dihedral
angles
to
construct
co-assemblies
explore
the
induced
CPL
behavior
from
pyrenyl
(Py)
emitters
in
LC
through
regulation
of
helical
nanofibers
during
co-assembly
process.
Most
interestingly,
(R/S-M)0.1-(P3)0.9
emitted
an
inverted
blue-colored
signal
thermal
annealing
treatment
at
glass
transition
temperature
due
flexible
main
chain
polymer
(LC-P3).
The
strongest
emission
spin-coated
film
(λem
=
455
nm,
|gem|
6.47
×
10-2,
ΦF
48.5%)
could
be
detected
using
105
°C.
Abstract
The
development
and
applications
of
materials
with
efficient
circularly
polarized
luminescence
(CPL)
have
become
an
interdisciplinary
frontier
research
topic.
We
summarize
herein
the
recent
advance
in
CPL‐active
aggregates
based
on
metal‐ligand
coordination
(termed
as
“coordination
aggregates”).
surveyed
are
classified
small‐molecular
metal
complexes,
which
include
monocomponent
assemblies
Pt(II)
complexes
other
binary
helicates,
polymers,
frameworks.
efforts
improving
dissymmetry
factors
quantum
yields
these
use
aggregation
strategy
enhancing
performance
isolated
molecules
discussed.
chiral
organic
light‐emitting
diodes
(OLEDs)
solution‐
or
evaporation‐processed
procedures
surveyed.
In
addition,
uses
lanthanide
CPL‐contrast
imaging
CPL
probes
highlighted.
common
discussion
mechanism
aggregation‐enhanced
CPLs
a
perspective
future
works
finally
given.
Advanced Materials,
Год журнала:
2022,
Номер
34(17)
Опубликована: Март 1, 2022
Organic
light-emitting
diodes
(OLEDs)
that
can
simultaneously
achieve
narrowband
emission,
high
efficiency,
and
circularly
polarized
luminescence
remain
a
formidable
challenge.
In
this
study,
simple
strategy
is
developed
to
address
A
chiral
exciplex-forming
co-host
first
designed
by
employing
donor
an
achiral
acceptor
molecule.
The
exciplex
host
enables
green
multiple-resonance
thermally
activated
delayed
fluorescence
emitter
high-performance
electroluminescence
(CP-EL)
with
external
quantum
efficiency
of
33.2%,
large
dissymmetry
factor
2.8
×
10-3
,
small
full-width
at
half-maximum
42
nm.
This
work
provides
general
approach
for
realizing
CP-EL
using
easily
available
emitters
significantly
extend
the
scope
OLEDs.
Chemical Reviews,
Год журнала:
2024,
Номер
124(7), С. 4332 - 4392
Опубликована: Март 28, 2024
Since
the
emergence
of
first
green
light
emission
from
a
fluorescent
thin-film
organic
emitting
diode
(OLED)
in
mid-1980s,
global
consumer
market
for
OLED
displays
has
flourished
over
past
few
decades.
This
growth
can
primarily
be
attributed
to
development
noble
metal
phosphorescent
emitters
that
facilitated
remarkable
gains
electrical
conversion
efficiency,
broadened
color
gamut,
and
vibrant
image
quality
displays.
Despite
these
achievements,
limited
abundance
metals
Earth's
crust
spurred
ongoing
efforts
discover
cost-effective
electroluminescent
materials.
One
particularly
promising
avenue
is
exploration
thermally
activated
delayed
fluorescence
(TADF),
mechanism
with
potential
fully
harness
excitons
OLEDs.
Recently,
investigations
have
unveiled
TADF
series
two-coordinate
coinage
(Cu,
Ag,
Au)
complexes.
These
organometallic
materials
exhibit
distinctive
behavior
comparison
their
counterparts.
They
offer
benefits
such
as
tunable
emissive
colors,
short
lifetimes,
high
luminescent
quantum
yields,
reasonable
stability.
Impressively,
both
vacuum-deposited
solution-processed
OLEDs
incorporating
achieved
outstanding
performance.
review
encompasses
various
facets
on
complexes,
including
molecular
design,
photophysical
characterizations,
elucidation
structure–property
relationships,
applications.
Advanced Materials,
Год журнала:
2023,
Номер
36(5)
Опубликована: Сен. 12, 2023
Chiral
B/N
embedded
multi-resonance
(MR)
emitters
open
a
new
paradigm
of
circularly
polarized
(CP)
organic
light-emitting
diodes
(OLEDs)
owing
to
their
unique
narrowband
spectra.
However,
pure-red
CP-MR
and
devices
remain
exclusive
in
literature.
Herein,
by
introducing
B-N
covalent
bond
lower
the
electron-withdrawing
ability
para-positioned
B-π-B
motif,
first
pair
double
hetero-[n]helicenes
(n
=
6
7)
emitter
peaking
617
nm
with
small
full-width
at
half-maximum
38
high
photoluminescence
quantum
yield
≈100%
toluene
is
developed.
The
intense
mirror-image
CP
light
produced
enantiomers
characterized
dissymmetry
factors
(g
