Chemical Science,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Jan. 1, 2024
The
advancement
of
desirable
circularly
polarized
luminescence
(CPL)
emitters
is
predominantly
constrained
by
the
effective
regulation
magnetic
and
electric
transition
vectors,
particularly
within
deep-blue
spectral
domain.
Herein,
we
present
four
pairs
novel
chiral
with
systematically
varied
molecular
rigidity,
symmetry,
centers
to
elucidate
intrinsic
coupling
key
parameters
influencing
their
chiroptical
properties.
Notably,
incorporation
appropriate
intramolecular
3D-interlocking
a
natural
binaphthyl
chirality
skeleton
offers
an
approach
achieving
both
significantly
narrowed
full
width
at
half
maximum
(FWHM,
as
low
18
nm)
substantially
enhanced
activity
(luminous
dissymmetry
factor,
InfoMat,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 27, 2025
Abstract
Multiresonance
organoboron
helicenes
are
promising
narrowband
circularly
polarized
luminescence
(CPL)
emitters,
which,
however,
still
face
formidable
challenges
to
balance
a
large
dissymmetry
factor
(
g
lum
)
and
high
efficiency.
Here,
two
pairs
of
enantiomers
P/M
‐BN[8]H‐ICz
‐BN[8]H‐BO)
with
the
same
hetero[8]helicene
geometric
structures
developed
through
polycyclization
decoration.
We
find
that
it
is
helicity
helicene
electronic
rather
than
geometrical
one
determines
molecular
property
as
larger
could
enhance
electron‐orbital
coupling
structure.
Therefore,
‐BN[8]H‐BO
who
possesses
structure
realizes
nearly
one‐order‐of‐magnitude
higher
(+2.75/−2.52
×
10
−3
photoluminescence
quantum
yield
(PLQY)
99%
compared
bearing
only
hetero[6]helicene
distribution
+2.41/−2.37
−4
PLQY
95%).
Moreover,
BN[8]H‐BO
exhibits
green
emission
peaking
at
538
nm
full‐width
half‐maxima
merely
34
nm,
narrower
most
multiresonance
CPL
helicenes.
The
corresponding
organic
light‐emitting
diodes
simultaneously
realize
external
efficiency
31.7%,
an
electroluminescence
factors
EL
+5.23/−5.07
,
extremely
long
LT95
(time
95%
initial
luminance)
over
731
h
luminance
1000
cd
m
–
2
.
image
Advanced Functional Materials,
Journal Year:
2025,
Volume and Issue:
unknown
Published: April 15, 2025
Abstract
Chiral
multiple
resonance
thermally
activated
delayed
fluorescence
(CP‐MR‐TADF)
emitters
have
obtained
attention
due
to
their
potential
in
organic
light‐emitting
diodes
(CP‐OLEDs)
with
circularly
polarized
luminescence
(CPL).
Moreover,
the
devices
always
rely
on
doping
concentration
aggregation‐caused
quenching
of
CP‐MR‐TADF
emitters.
Herein,
three
MR‐TADF
materials
(
p
‐ICz‐N‐BN
,
m
and
‐prCz‐N‐BN
)
are
presented
by
face‐to‐face
arrangement
indolo[3,2,1‐
jk
]carbazole
fluorophore
sterically
naphthalene
bridge,
showing
emissions
peaking
at
496–499
nm
full‐width
half‐maximum
values
23–26
photoluminescence
quantum
yields
91%–98%,
respectively.
Because
asymmetric
steric
hindrance
structures,
both
separated
into
innovative
planar
enantiomers,
exhibiting
symmetric
CPL
spectra
dissymmetry
factors
(|
g
PL
|)
up
1.1
×
10
−3
2.3
toluene
films,
Furthermore,
OLEDs
illustrate
maximum
external
efficiencies
31.5%,
33.7%,
32.4%,
respectively,
still
remain
high
levels
even
20
wt.%
almost
unchanged
emission
spectra.
Additionally,
CP‐OLEDs
R
/
S
‐
display
|
EL
1.88
1.89
Materials Horizons,
Journal Year:
2024,
Volume and Issue:
11(19), P. 4674 - 4680
Published: Jan. 1, 2024
The
spiroannulation
of
multiple
resonance
core
skeleton
gives
rise
to
pure-green
emitters
and
superior
electroluminescence
performance
with
low
efficiency
roll-off.
Chemical Science,
Journal Year:
2024,
Volume and Issue:
15(41), P. 16917 - 16927
Published: Jan. 1, 2024
Helically
chiral
MR-TADF
compounds
tBuPh-BN
and
DPA-tBuPh-BN
show
narrowband
circularly
polarized
luminescence
that
translates
into
high-performance
hyperfluorescent
organic
light-emitting
diodes.
Research Square (Research Square),
Journal Year:
2024,
Volume and Issue:
unknown
Published: Sept. 26, 2024
Abstract
Introducing
spiral
polycyclic
aromatic
hydrocarbons
(PAHs)
in
multiple
resonances
thermally
activated
delayed
fluorescence
(MR-TADF)
emitters
to
achieve
small
FWHM
values
and
high
efficiency
remains
a
formidable
challenge.
This
research
departs
from
the
conventional
molecular
design
strategy
that
utilizes
PAHs
solely
as
side
chains,
terminal
groups,
or
linkage
units.
Instead,
we
integrate
rigid
9,9'-spirobi[fluorene]
(SF)
unit
fully
partially
into
boron/
nitrogen
MR
(B/N-MR)
emitting
core
successfully
developed
range
of
brand-new
proof-of-concept
isomerized
MR-TADF
emitters,
SF-BN1,
SF-BN2,
SF-BN3,
SF-BN4.
Remarkably,
these
novel
exhibit
exceptionally
narrow
full-width
at
half-maximum
(FWHM)
15～21
nm
dilute
toluene
solutions
photoluminescence
quantum
yields
(PLQYs)
up
90%
doped
films.
The
corresponding
organic
light-emitting
diode
(OLED)
based
on
SF-BN1
achieved
external
(EQE)
29.0%,
with
CIE
coordinates
(0.13,
0.08),
closely
aligning
BT.2020
blue
emission
standard.
Sky-blue
OLEDs
SF-BN3
can
EQE
29.8%,
an
highly
value
18
nm;
hyperfluorescent
improved
35.5%.
Moreover,
elucidated
subtlevariations
connectivity
chemical
functional
groups
within
well
polar
environment
doping
concentrations
OLEDs,
which
significantly
impact
optical
electroluminescent
properties
isomers.
unveils
new
opportunities
for
exploration
potential
luminescent
materials
suitable
ultra-high-definition
(UHD)
display
technologies.
