Nano Letters,
Journal Year:
2024,
Volume and Issue:
24(42), P. 13307 - 13314
Published: Oct. 10, 2024
Long-wavelength
afterglow
emitters
are
crucial
for
optoelectronics
and
information
security;
however,
it
remains
a
challenge
in
achieving
high
luminescence
efficiency
due
to
the
lack
of
effective
modulation
electronic
coupling
nonradiative
transitions
singlet/triplet
excitons.
Here,
we
demonstrate
an
organic-carbon-dot
(CD)
hybrid
system
that
operates
via
space-confined
energy
transfer
strategy
obtain
bright
emission
centered
at
600
nm
with
near-unity
efficiency.
Photophysical
characterization
theoretical
calculation
confirm
efficient
can
be
assigned
synergistic
effect
intermolecular
from
triplet
excitons
CDs
singlets
subluminophores
intense
restraint
decay
losses
singlet/triplet-state
rationally
rigidification
amination
modification.
By
utilizing
precursor
engineering,
yellow
near-infrared
575
680
efficiencies
94.4%
45.9%
has
been
obtained.
Lastly,
these
highly
emissive
powders
enable
superior
performance
lighting
security.
Chemical Society Reviews,
Journal Year:
2023,
Volume and Issue:
52(22), P. 8005 - 8058
Published: Jan. 1, 2023
Afterglow
materials
have
attracted
widespread
attention
owing
to
their
distinctive
and
long-lived
optical
emission
properties
which
create
exciting
opportunities
in
various
fields.
Advanced Materials,
Journal Year:
2024,
Volume and Issue:
36(27)
Published: April 23, 2024
Abstract
The
development
of
single‐system
materials
that
exhibit
both
multicolor
room‐temperature
phosphorescence
(RTP)
and
thermally
activated
delayed
fluorescence
(TADF)
with
tunable
after
glow
colors
channels
is
challenging.
In
this
study,
four
metal‐free
carbon
dots
(CDs)
are
developed
through
structural
tailoring,
panchromatic
high‐brightness
RTP
achieved
via
strong
chemical
encapsulation
in
urea.
maximum
lifetime
quantum
yield
reaches
2141
ms
56.55%,
respectively.
Moreover,
CDs‐IV@urea,
prepared
coreshell
interaction
engineering,
exhibits
a
dual
afterglow
red
green
TADF.
degree
conjugation
functional
groups
precursors
affects
the
binding
interactions
nitrogen
cladding
on
CDs,
which
turn
stabilizes
triplet
energy
levels
gap
between
S
1
T
(Δ
E
ST
)
to
induce
RTP.
enhanced
wrapping
lowers
Δ
,
promoting
reverse
intersystem
crossing,
leads
This
fully
state,
thus
stabilizing
material
water,
even
extreme
environments
such
as
acids
oxidants.
These
tested
multicolor,
time,
temperature
multiencryption
well
vivo
bioimaging.
Hence,
these
have
promising
practical
applications
information
security
biomedical
diagnosis
treatment.
Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
34(25)
Published: Feb. 6, 2024
Abstract
Afterglow
materials
have
attracted
much
attention
owing
to
their
long
luminescence
lifetimes,
large
Stokes
shifts,
and
emission
without
real‐time
excitation.
Compared
with
traditional
organic
afterglow
materials,
carbon
dots
(CDs),
as
a
new
material,
superior
properties
such
easy
preparation,
low
toxicity,
cost.
The
color
of
CDs
can
be
regulated
by
external
factors
excitation
wavelength,
temperature,
time,
which
is
highly
significant
for
expanding
the
diversified
applications
make
them
available
biotechnology
information
applications.
This
review
summarizes
research
progress
multicolor
in
recent
years,
including
regulation
strategies,
preparation
methods,
First,
are
classified
into
three
strategies:
room
temperature
phosphorescence
(RTP),
thermally
activated
delayed
fluorescence
converted
RTP,
based
on
Förster
resonance
energy
transfer,
strategies
regulating
analyzed.
Second,
methods
achieving
summarized
both
matrix‐free
matrix‐confined
aspects.
Then,
anticounterfeiting
encryption,
sensing
bioimaging
introduced
detail.
Finally,
future
challenges
opportunities
prospected
provide
ideas
controlled
design
wide
application.
Advanced Optical Materials,
Journal Year:
2023,
Volume and Issue:
12(7)
Published: Oct. 26, 2023
Abstract
Colloidal
carbon
dots
(C‐dots)
are
considered
as
promising
heavy‐metal‐free
materials
to
achieve
room‐temperature
phosphorescence
(RTP)
properties
for
applications,
such
photoelectronic
devices,
information
encryption,
and
bio‐imaging.
However,
most
of
the
current
obtained
RTP
C‐dots
have
a
short
lifetime
with
relatively
low
quantum
yield
(QY).
In
this
work,
large‐scale
synthesized
via
vacuum
heating
approach
multiple
emissions
(blue,
green,
yellow),
long
high
1.92
s,
QY
34.4%
by
selecting
different
types
precursors,
which
is
superior
reported
C‐dots.
The
atoms
doping
strong
bonding
between
neighbored
promoted
contributes
excellent
properties.
As
proof‐of‐concept,
as‐obtained
used
optical
ink
flexible
security
codes,
exhibiting
bright
shape
1.37
s.
This
work
offers
an
efficient
producing
high‐quality
C‐dots,
can
be
applied
anti‐counterfeiting
encryption
systems.
Advanced Materials,
Journal Year:
2024,
Volume and Issue:
36(24)
Published: Feb. 29, 2024
Abstract
The
development
of
bright
and
long‐lived
aqueous
room‐temperature
phosphorescent
(RTP)
materials
holds
paramount
importance
in
broadening
the
application
scope
RTP
material
system.
However,
conventional
usually
exhibit
low
efficiency
short
lifetime
solution.
Herein,
an
situ
host–guest
strategy
is
proposed
to
achieve
cyanuric
acid
(CA)‐derived
carbon
nitrogen
dots
(CNDs)
composite
(CNDs@CA)
that
demonstrates
a
significant
enhancement
both
quantum
yield
(QY)
mediated
by
water.
Detailed
investigations
reveal
robust
hydrogen
bonding
networks
between
CNDs@CA
water
effectively
stabilize
triplet
excitons
suppress
nonradiative
decays,
as
well
facilitate
efficient
energy
transfer
from
CA
CNDs,
thereby
prolonging
enhancing
RTP.
QY
can
be
increased
26.89%
(3.9‐fold
increase)
951.25
ms
(5.5‐fold
increase),
respectively,
with
incorporation
50
wt%
under
ambient
conditions.
Even
fully
environments
(with
up
400
added),
exhibits
persistent
water‐boosted
properties,
demonstrating
exceptional
stability.
property
solutions
presents
potential
for
high
signal‐to‐noise
ratio
afterglow
bioimaging
advanced
information
encryption.
Nature Communications,
Journal Year:
2024,
Volume and Issue:
15(1)
Published: Aug. 9, 2024
Multicolor
tuning
of
persistent
luminescence
has
been
extensively
studied
by
deliberately
integrating
various
luminescent
units,
known
as
activators
or
chromophores,
into
certain
host
compounds.
However,
it
remains
a
formidable
challenge
to
fine-tune
the
spectra
either
in
organic
materials,
such
small
molecules,
polymers,
metal-organic
complexes
and
carbon
dots,
doped
inorganic
crystals.
Herein,
we
present
strategy
delicately
control
wavelength
engineering
sub-bandgap
donor-acceptor
states
series
single-phase
Ca(Sr)ZnOS
The
emission
peak
can
be
quasi-linearly
tuned
across
broad
range
(500-630
nm)
function
Sr/Ca
ratio,
achieving
precision
down
~5
nm.
Theoretical
calculations
reveal
that
fine-tuning
stems
from
constantly
lowered
donor
levels
accompanying
modified
band
structure
Sr
alloying.
Besides,
our
experimental
results
show
these
crystals
exhibit
high
initial
luminance
5.36
cd
m
