Advanced Materials,
Journal Year:
2025,
Volume and Issue:
unknown
Published: April 13, 2025
Abstract
Phosphorescent
materials
offer
a
promising
approach
to
information
encryption
due
their
long
luminescence
lifetimes
and
high
signal‐to‐noise
ratios.
However,
fixed
phosphorescent
patterns
are
vulnerable
imitation
over
time,
limiting
effectiveness
in
advanced
encryption.
Here,
time‐division
multiplexing
physical
unclonable
function
(TDM‐PUF)
label
utilizing
multicolor
carbon
dots
(CDs)
is
proposed
that
leverages
variations
wavelength
lifetime
construct
time‐resolved,
multidimensional
cryptographic
protocols.
Efficient
multi‐color
phosphorescence
CDs
achieved
by
enhancing
intersystem
crossing,
suppressing
non‐radiative
transitions
through
confinement
effects,
regulating
emission
spectra
via
energy
transfer.
The
random
spatial
distribution
unpredictable
emissions
of
significantly
enhance
the
complexity
PUF
system,
thereby
fortifying
its
defenses
against
mimicry
attacks.
Furthermore,
this
system
exhibits
multiple
optical
responses
allowing
correct
recognition
only
at
specified
time
nodes,
achieving
time‐resolved
anti‐counterfeiting.
Finally,
segmenting
labels
based
on
color
channels,
non‐overlapping
multi‐time
segments
achieved,
enabling
highly
secure
multiplexed
study
provides
competitive
anti‐counterfeiting
inspires
development
novel
strategies.
Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Dec. 23, 2024
Abstract
Highly
luminescent
carbon
dots
(CDs)
have
garnered
significant
attention
and
are
increasingly
utilized
in
various
fields.
Despite
its
importance,
there
has
been
a
lack
of
comprehensive
reviews
focusing
specifically
on
highly
CDs.
It
is
aimed
here
to
fill
that
gap
by
exploring
CDs
with
high
photoluminescence
quantum
yield
(PLQY),
starting
an
examination
the
mechanisms
underlying
The
selection
synthetic
raw
materials
preparation
methods
along
research
progress
reviewed
information
across
bands
then
statistically
summarized
several
tables.
Subsequently,
structural
features,
synthesis
methods,
purification
strategies
lead
PLQY
based
analyzing
collected
examples
Furthermore,
luminescent‐based
multifunctional
applications
bioimaging,
light‐emitting
diodes,
solar
concentrators,
lasers
introduced.
Finally,
current
landscape
evaluated,
existing
challenges
identified,
feasible
directions
proposed
for
future
development.
Advanced Optical Materials,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 12, 2025
Abstract
To
realize
the
practical
application
of
carbon
dots
(CDs),
it
is
crucial
to
devise
straightforward
techniques
that
can
finely
modulate
fluorescent
properties
CDs.
Apart
from
that,
imperative
weaken
aggregation‐caused
quenching
(ACQ)
effect,
which
poses
a
significant
challenge
utilization
solid‐state
In
this
work,
three
CDs
named
as
CDs‐1,
CDs‐2,
and
CDs‐3
are
synthesized,
fluorescence
tuning
these
successfully
realized,
assisted
by
cetyltrimethylammonium
bromide
(CTAB)
surfactant,
because
its
unique
molecular
structure
conducive
in
bolstering
intensity
adjusting
emission
wavelength.
Furthermore,
luminescence
achieved
employing
CTAB
substrate
matrix‐assisted
synthesis
composites
CDs‐1@CTAB,
CDs‐2@CTAB,
CDs‐3@CTAB.
Notably,
photoluminescence
quantum
yield
(PLQY)
CDs‐2@CTAB
reaches
an
impressive
value
high
79.31%,
surpassing
70.29%
obtained
pristine
CDs‐2.
The
experimental
results
reveal
CDs@CTAB
exhibit
intriguing
afterglow
characteristics
including
room
temperature
phosphorescence
(RTP)
thermally
activated
delayed
(TADF).
This
work
confirms
versatility
highlights
significance
surfactant‐assisted
strategies
improving
performance
Small,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 12, 2025
Abstract
Developing
single‐particle
nanocomposite
with
aqueous‐phase
orthogonal
multicolor
phosphorescence
or
multimodal
luminescence
holds
great
significance
for
optical
coding,
anti‐counterfeiting
encryption,
bioimaging,
and
biosensing.
However,
it
faces
challenges
such
as
a
limited
range
of
emission
wavelengths
difficulties
in
controlling
the
synthesis
process.
In
this
work,
conjugate
structure
manipulation
integrated
luminophor
confinement
strategy
is
proposed
to
prepare
carbon
dots@upconversion
nanoparticles
(CDs@UCNPs)
featuring
room‐temperature
phosphorescence‐upconversion
(RTP‐UCL)
through
wet‐chemical
synthetic
methods.
Four
types
CDs
are
synthesized
by
introducing
molecules
varying
degrees
conjugation,
while
intersystem
crossing
process
enhanced
constructing
charge‐transfer
states
narrow
energy
gap
between
excited
singlet
triplet
states.
Aqueous‐phase
RTP
(green,
yellow,
orange)
UCL
(blue,
green,
red)
achieved
confining
different
conjugation
within
NaBiF
4
matrix
doped
various
lanthanide
ions.
Notably,
UCNPs
can
crystallize
at
low
temperatures,
serving
immobilize
CDs,
thereby
preventing
their
vibration
rotation,
minimizing
interference
from
water
oxygen.
Additionally,
versatility
demonstrated
CDs@Cs
2
NaGdCl
6
:
5%Yb
3+
,10%Er
perovskite
nanocomposites.
This
offers
valuable
guidance
preparation
advanced
materials.
Nano Letters,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Feb. 28, 2025
Carbon
dots
(CDs)
with
circularly
polarized
long
afterglow
(CPLA)
properties
have
received
increasing
attention
as
a
cutting-edge
research
field.
However,
because
the
CDs
both
and
chirality
are
difficult
to
prepare
color
of
most
phosphorescent
is
mainly
concentrated
in
short
wavelengths,
it
still
formidable
challenge
explore
facile
route
achieve
intrinsic
CD-based
color-tunable
CPLA
materials
on
large
scale.
Herein,
we
developed
gram-scale
synthesis
method
via
simple
hydrothermal
mixture
boric
acid,
arginine,
various
fluorescent
dyes.
The
tunable
successfully
achieved
by
engineering
situ
phosphorescence
resonance
energy
transfer
(PRET)
between
formed
carbonization
arginine
some
dyes
those
uncarbonized
Finally,
applications
CD
composites
multimode
advanced
anti-counterfeiting
information
encryption
were
explored.
Macromolecular Chemistry and Physics,
Journal Year:
2025,
Volume and Issue:
unknown
Published: March 8, 2025
Abstract
In
recent
years,
organic
room
temperature
phosphorescence
(RTP)
materials
have
been
well
developed.
Especially,
when
the
compounds
are
doped
into
a
rigid
polymeric
matrix,
their
RTP
performances
can
be
greatly
enhanced.
However,
dispersibility
and
stability
of
difficult
to
controlled.
Herein,
an
amorphous
homo‐polymer
(
P1
)
containing
naphthalimide
units
is
synthesized
further
dispersed
polyvinyl
alcohol
(PVA)
matrix
via
solution
mixing
procedure.
The
resultant
composites
P1@PVA
exhibit
yellow
afterglow
under
temperature.
,
chromophores
constrained
in
aggregation
state.
Unlike
crystalline
state,
intermolecular
interactions
between
aggregated
enhanced,
while
π–π
interaction
weakened.
presence
PVA,
non‐radiative
decay
synergistically
suppressed
by
external
hydrogen
bonds
internal
interactions.
As
results,
much
Comparing
with
PVA
compounds,
lifetime
prolonged
as
1.5
folds.
