Nature Communications,
Journal Year:
2024,
Volume and Issue:
15(1)
Published: April 8, 2024
Abstract
Carbon
quantum
dots
are
emerging
as
promising
nanomaterials
for
next-generation
displays.
The
elaborate
structural
design
is
crucial
achieving
thermally
activated
delayed
fluorescence,
particularly
improving
external
efficiency
of
electroluminescent
light-emitting
diodes.
Here,
we
report
the
synthesis
onion-like
multicolor
fluorescence
carbon
with
yields
42.3–61.0%.
Structural,
spectroscopic
characterization
and
computational
studies
reveal
that
structures
assembled
from
monomer
different
sizes
account
decreased
singlet-triplet
energy
gap,
thereby
efficient
fluorescence.
devices
exhibit
maximum
luminances
3785–7550
cd
m
−2
6.0–9.9%.
Importantly,
owing
to
weak
van
der
Waals
interactions
adequate
solution
processability,
flexible
a
luminance
2554
realized.
These
findings
facilitate
development
high-performance
dots-based
diodes
practical
applications.
Chemical Society Reviews,
Journal Year:
2020,
Volume and Issue:
50(2), P. 1030 - 1069
Published: Nov. 24, 2020
The
development
process,
molecular
design
principles,
material
systems,
structure–property
relationships
and
OLED
applications
of
hot
exciton
materials
are
comprehensively
summarized.
Advanced Materials,
Journal Year:
2021,
Volume and Issue:
34(9)
Published: Dec. 8, 2021
To
achieve
an
ultimate
wide
color
gamut
for
ultrahigh-definition
displays,
there
is
great
demand
the
development
of
organic
light-emitting
diodes
(OLEDs)
enabling
monochromatic,
ultrapure
blue
electroluminescence
(EL).
Herein,
high-efficiency
and
OLEDs
based
on
polycyclo-heteraborin
multi-resonance
thermally
activated
delayed
fluorescence
(MR-TADF)
materials,
BOBO-Z,
BOBS-Z,
BSBS-Z,
are
reported.
The
key
to
design
present
luminophores
exquisite
combination
interplay
multiple
boron,
nitrogen,
oxygen,
sulfur
heteroatoms
embedded
in
a
fused
polycyclic
π-system.
Comprehensive
photophysical
computational
investigations
this
family
MR-TADF
materials
reveal
that
systematic
implementation
chalcogen
(oxygen
sulfur)
atoms
can
finely
modulate
emission
while
maintaining
narrow
bandwidth,
as
well
spin-flipping
rates
between
excited
singlet
triplet
states.
Consequently,
BSBS-Z
demonstrate
narrowband
EL
emission,
with
peaks
at
445-463
nm
full
width
half
maxima
18-23
nm,
leading
Commission
Internationale
de
l'Éclairage-y
coordinates
range
0.04-0.08.
Particularly,
incorporating
sulfur-doped
BOBS-Z
notably
high
maximum
external
quantum
efficiencies
26.9%
26.8%,
respectively,
small
efficiency
roll-offs
achieved
concurrently.
Angewandte Chemie International Edition,
Journal Year:
2020,
Volume and Issue:
60(42), P. 22624 - 22638
Published: Aug. 12, 2020
There
has
been
much
interest
in
dual-emission
materials
the
past
few
years
for
and
life
science
applications;
however,
a
systematic
overview
of
underlying
processes
is
so-far
missing.
We
resolve
this
issue
herein
by
classifying
(DE)
phenomena
as
relying
on
one
emitter
with
two
emitting
states
(DE1),
independent
emitters
(DE2),
or
correlated
(DE3).
Relevant
DE
mechanisms
are
then
briefly
described
together
electronic
and/or
geometrical
conditions
under
which
they
occur.
For
further
reading,
references
given
that
offer
detailed
insight
into
complex
mechanistic
aspects
various
provide
overviews
families
their
applications.
By
avoiding
ambiguities
misinterpretations,
systematic,
insightful
Review
might
inspire
future
targeted
designs
materials.
Advanced Optical Materials,
Journal Year:
2021,
Volume and Issue:
9(13)
Published: April 30, 2021
Abstract
Luminescent
small,
all‐organic
molecules
are
of
tremendous
interest
in
materials
and
life
science
applications.
Nevertheless,
targeted
design
requires
a
basic
understanding
the
excited
state
deactivation
pathways
themselves,
modulations
processes
that
occur
solid
state.
This
particularly
concerns
crystalline
molecular
solids,
as
here
not
only
solid‐state
rigidification
contributes
to
these
modulations,
but
specific
intermolecular
interactions
well.
Starting
from
properties,
this
work
carefully
disentangles
all
intramolecular
factors
radiative
nonradiative
solids
provide
guidelines
for
design.
Advanced Science,
Journal Year:
2021,
Volume and Issue:
8(24)
Published: Oct. 27, 2021
Abstract
The
development
of
simple,
efficient,
and
biocompatible
organic
luminescent
molecules
is
great
significance
to
the
clinical
transformation
biomaterials.
In
recent
years,
purely
thermally
activated
delayed
fluorescence
(TADF)
materials
with
an
extremely
small
single‐triplet
energy
gap
(Δ
E
ST
)
have
been
considered
as
most
promising
new‐generation
electroluminescence
emitters,
which
enormous
breakthrough
in
optoelectronics.
By
merits
unique
photophysical
properties,
high
structure
flexibility,
reduced
health
risks,
such
metal‐free
TADF
luminophores
attracted
tremendous
attention
biomedical
fields,
including
conventional
imaging,
time‐resolved
imaging
sensing,
photodynamic
therapy.
However,
there
currently
no
systematic
summary
for
applications,
presented
this
review.
Besides
a
brief
introduction
major
developments
material,
typical
mechanisms
fundamental
principles
on
design
strategies
nanomaterials
are
subsequently
described.
Importantly,
specific
emphasis
placed
discussion
various
applications.
Finally,
authors
make
forecast
remaining
challenges
future
developments.
This
review
provides
insightful
perspectives
clear
prospects
towards
rapid
biomedicine,
will
be
highly
valuable
exploit
new
materials.
Organic Electronics,
Journal Year:
2019,
Volume and Issue:
75, P. 105422 - 105422
Published: Aug. 25, 2019
This
review
focuses
on
different
structures
of
molecules
containing
carbazole
units
with
particular
emphasis
donor-acceptor
(D-A)
type
materials.
The
also
includes
carbazole-based
materials
bipolar
charge
transport
properties.
Different
aspects
properties
and
their
use
in
light-emitting
applications
are
described.
the
performance
organic
light
emitting
diodes
(OLEDs)
summarized.
article
is
divided
according
to
role
respective
unit.
Carbazole-based
compounds
D-A
structure
particularly
important
TADF
host
material
phosphorescence
OLEDs.
Nature Communications,
Journal Year:
2020,
Volume and Issue:
11(1)
Published: Feb. 11, 2020
Abstract
Organic
photovoltaics
based
on
non-fullerene
acceptors
(NFAs)
show
record
efficiency
of
16
to
17%
and
increased
photovoltage
owing
the
low
driving
force
for
interfacial
charge-transfer.
However,
potentially
slows
down
charge
generation,
leading
a
tradeoff
between
voltage
current.
Here,
we
disentangle
intrinsic
charge-transfer
rates
from
morphology-dependent
exciton
diffusion
series
polymer:NFA
systems.
Moreover,
establish
influence
energetics
electron
hole
transfer
separately.
We
demonstrate
that
timescales
remain
at
few
hundred
femtoseconds
even
near-zero
force,
which
is
consistent
with
predicted
by
Marcus
theory
in
normal
region,
moderate
electronic
coupling
re-organization
energy.
Thus,
design
highly
efficient
devices,
energy
offset
donor:acceptor
interface
can
be
minimized
without
jeopardizing
rate
concerns
about
current-voltage
tradeoff.
