ACS Applied Materials & Interfaces,
Journal Year:
2023,
Volume and Issue:
15(5), P. 7466 - 7484
Published: Jan. 27, 2023
Increasing
the
security
of
anticounterfeiting
materials
has
been
most
important
challenge
in
recent
years,
and
development
dual-color
photoluminescent
inks
with
multi-level
security,
static/dynamic
emission,
dynamic
color
change
is
an
solution
to
overcome
this
problem.
In
study,
multi-functionalized
copolymer
nanoparticles
containing
different
functional
groups
(with
a
concentration
20
wt
%),
including
ester,
carboxylic
acid,
hydroxyl,
epoxide,
amide,
amine
were
synthesized
successfully
by
emulsion
polymerization
method.
The
results
showed
that
particle
size
morphology
are
affected
polarity
groups.
prepared
modified
physically
spiropyran
(photochromic
red
fluorescence
emission)
coumarin
(cyan
derivatives
develop
polymer
application
static-dynamic
inks,
which
have
security.
investigation
optical
properties
indicates
kinetics
photochromism
photoluminescence
samples
dependent
on
local
surface
nanoparticles.
Hence,
increase
(functionalization
hydroxyl
groups)
resulted
fast
photochromism,
high-intensity
emission
increased
efficiency
photoswitchable
from
cyan
pink.
Dual-color
mixing
coumarin,
ratios
(1:1,
1:3,
1:5,
1:8,
1:10).
Obtained
under
UV
light
254
nm
(static
mode),
photoswitching
pink
(as
function
irradiation
time)
was
also
observed
UV-light
365
nm,
well
known
as
mode
emission.
responsivity
intensity
groups,
based
amide
functionalized
displayed
static
mode,
case
all
colloid
mixtures.
Printing
tags
cellulose
paper
advantages
such
maximum
printability,
resolution,
brightness,
high
for
ink
unique
reported
first
time
collaboration
coumarin.
This
study
can
open
new
approach
window
future
advanced
high-security
technologies.
ACS Nano,
Journal Year:
2020,
Volume and Issue:
14(11), P. 14417 - 14492
Published: Oct. 20, 2020
Counterfeiting
and
inverse
engineering
of
security
confidential
documents,
such
as
banknotes,
passports,
national
cards,
certificates,
valuable
products,
has
significantly
been
increased,
which
is
a
major
challenge
for
governments,
companies,
customers.
From
recent
global
reports
published
in
2017,
the
counterfeiting
market
was
evaluated
to
be
$107.26
billion
2016
forecasted
reach
$206.57
by
2021
at
compound
annual
growth
rate
14.0%.
Development
anticounterfeiting
authentication
technologies
with
multilevel
securities
powerful
solution
overcome
this
challenge.
Stimuli-chromic
(photochromic,
hydrochromic,
thermochromic)
photoluminescent
(fluorescent
phosphorescent)
compounds
are
most
significant
applicable
materials
development
complex
inks
high-security
level
fast
authentication.
Highly
efficient
have
developed
high
efficiency.
Applicable
applications
generally
based
on
photochromic
compounds,
hydrochromic
thermochromic
extensively
used
decades.
A
wide
range
materials,
organic
inorganic
metal
complexes,
polymer
nanoparticles,
quantum
dots,
carbon
upconverting
supramolecular
structures,
could
display
all
these
phenomena
depending
their
physical
chemical
characteristics.
The
polymeric
recently
received
attention
because
stability
printing
documents.
In
addition,
including
hand-writing,
stamping,
inkjet
printing,
screen
labels
discussed
introduction
methods
application
different
inks.
This
review
would
help
scientists
design
develop
encryption,
authentication,
security,
detection,
potential
marking
information
encryption
various
substrates.
Aggregate,
Journal Year:
2021,
Volume and Issue:
2(1), P. 20 - 34
Published: Jan. 15, 2021
Abstract
Luminescence
anti‐counterfeiting
derives
from
the
easily
changeable
luminescence
behaviors
of
materials
under
regulation
various
external
stimuli
(such
as
excitation
light,
chemical
reagent,
heat,
and
mechanical
force,
etc.)
lifetime,
which
plays
an
important
role
in
preventing
forgery
currency,
artworks,
product
brands.
According
to
numbers
changes
labels
conditions,
can
be
classified
into
three
levels
elementary
advanced:
single‐level
anti‐counterfeiting,
double‐level
multilevel
anti‐counterfeiting.
In
this
review,
recent
achievements
are
summarized,
factors
is
discussed.
Finally,
existing
problems,
future
challenges,
possible
development
directions
proposed
order
realize
facile,
quick,
low‐cost,
environmentally
friendly,
difficult‐to‐replicate
advanced
Nature Communications,
Journal Year:
2021,
Volume and Issue:
12(1)
Published: March 1, 2021
Abstract
While
photoluminescence
printing
is
a
widely
applied
anticounterfeiting
technique,
there
are
still
challenges
in
developing
new
generation
materials
with
high
security.
Here
we
report
the
construction
of
photoresponsive
supramolecular
coordination
polyelectrolyte
(SCP)
through
hierarchical
self-assembly
lanthanide
ion,
bis-ligand
and
diarylethene
unit,
driven
by
metal-ligand
ionic
interaction.
Owing
to
conformation-dependent
photochromic
fluorescence
resonance
energy
transfer
between
donor
acceptor,
ring-closure/ring-opening
isomerization
unit
leads
photoreversible
luminescence
on/off
switch
SCP.
The
SCP
then
utilized
as
security
ink
print
various
patterns,
which
multiple
information
patterns
visible/invisible
transformations
realized
simply
alternating
irradiation
UV
visible
light.
This
work
demonstrates
possibility
class
smart
materials,
could
be
operated
noninvasive
manner
higher
level
Nature Communications,
Journal Year:
2021,
Volume and Issue:
12(1)
Published: Jan. 29, 2021
Abstract
Creating
a
security
label
that
carries
entirely
distinct
information
in
reflective
and
fluorescent
states
would
enhance
anti-counterfeiting
levels
to
deter
counterfeits
ranging
from
currencies
pharmaceuticals,
but
has
proven
extremely
challenging.
Efforts
tune
the
reflection
color
of
luminescent
materials
by
modifying
inherent
chemical
structures
remain
outweighed
substantial
trade-offs
fluorescence
properties,
vice
versa,
which
destroys
integrity
labels
either
or
color.
Here,
strategy
is
reported
design
geminate
programming
cholesteric
liquid
crystal
microdroplets
(two-tone
inks),
where
material
‘coated’
with
structural
helical
superstructures.
These
structurally
defined
fabricated
capillary
microfluidic
technique
contribute
different
intact
messages
both
patterns
labels.
Such
two-tone
inks
have
enormous
potential
provide
platform
for
encryption
protection
valuable
authentic
technology.
Chemical Reviews,
Journal Year:
2021,
Volume and Issue:
121(21), P. 13013 - 13050
Published: Sept. 7, 2021
Optically
variable
devices
(OVDs)
are
in
tremendous
demand
as
optical
indicators
against
the
increasing
threat
of
counterfeiting.
Conventional
OVDs
exposed
to
danger
fraudulent
replication
with
advances
printing
technology
and
widespread
copying
methods
security
features.
Metasurfaces,
two-dimensional
arrays
subwavelength
structures
known
meta-atoms,
have
been
nominated
a
candidate
for
new
generation
they
exhibit
exceptional
behaviors
that
can
provide
more
robust
solution
anti-counterfeiting.
Unlike
conventional
OVDs,
metasurface-driven
(mOVDs)
contain
multiple
responses
single
device,
making
them
difficult
reverse
engineered.
Well-known
examples
mOVDs
include
ultrahigh-resolution
structural
color
printing,
various
types
holography,
polarization
encoding.
In
this
review,
we
discuss
mOVDs.
The
fundamentals
plasmonic
dielectric
metasurfaces
presented
explain
how
be
manipulated.
Then,
monofunctional,
tunable,
multifunctional
discussed.
We
follow
up
discussion
fabrication
needed
realize
these
mOVDs,
classified
into
prototyping
manufacturing
techniques.
Finally,
an
outlook
classification
respect
their
capacity
level.
believe
newly
proposed
concept
may
bring
about
era
anticounterfeit
leveraging
novel
concepts
nano-optics
nanotechnology.
Chemical Society Reviews,
Journal Year:
2022,
Volume and Issue:
51(5), P. 1729 - 1765
Published: Jan. 1, 2022
Lanthanide-based
upconversion
nanomaterials
have
recently
attracted
considerable
attention
in
both
fundamental
research
and
various
frontier
applications
owing
to
their
excellent
photon
performance
favourable
physicochemical
properties.
In
particular,
the
emergence
of
multi-layer
core-shell
(MLCS)
nanostructures
offers
a
versatile
powerful
tool
realize
well-defined
matrix
compositions
spatial
distributions
dopant
on
nanometer
length
scale.
contrast
conventional
commonly
investigated
nanoparticles,
rational
design
MLCS
allows
us
deliberately
introduce
more
functional
properties
into
an
system,
thus
providing
unprecedented
opportunities
for
precise
manipulation
energy
transfer
channels,
dynamic
control
processes,
fine
tuning
switchable
emission
colours
new
integration
at
single-particle
level.
this
review,
we
present
summary
discussion
key
aspects
recent
progress
lanthanide-based
including
lifetime,
multicolour
output
lanthanide
ionic
interactions
nanoscale.
Benefitting
from
multifunctional
luminescence
properties,
exhibit
great
potential
diversities
such
as
three-dimensional
display,
laser,
optical
memory,
anti-counterfeiting,
thermometry,
bioimaging,
therapy.
The
outlook
challenges
well
perspectives
nanostructure
materials
are
also
provided.
This
review
would
be
greatly
helpful
exploring
structural
designs
further
manipulate
phenomenon
expand
application
boundaries.
Nature Communications,
Journal Year:
2022,
Volume and Issue:
13(1)
Published: July 20, 2022
Abstract
The
development
of
advanced
materials
for
information
encryption
with
time-dependent
features
is
essential
to
meet
the
increasing
demand
on
security.
Herein,
smart
orthogonal
and
temporal
properties
are
successfully
developed
based
a
dynamic
assembly-induced
multicolour
supramolecular
system.
Multicolour
fluorescence,
including
blue,
orange
even
white
light
emissions,
achieved
by
controlling
assembly
pyrene
derivatives
tailoring
solvent
composition.
By
taking
advantage
tuneable
dynamically
controlled
functions,
e.g.,
3D
codes,
developed.
Moreover,
materials,
such
as
multi-information
displays
4D
also
enabling
fluorescence-controllable
system
in
solid
phase,
showing
multiple
pieces
time
scale,
correct
can
be
identified
only
at
specified
time.
This
work
provides
an
inspiring
point
design
higher
security
requirements.
Advanced Functional Materials,
Journal Year:
2021,
Volume and Issue:
31(52)
Published: Sept. 24, 2021
Abstract
Fluorescent
patterns
showing
the
unique
color
change
in
response
to
external
stimuli
are
of
considerable
interest
for
their
applications
anti‐counterfeiting.
However,
there
is
still
a
lack
intelligent
fluorescent
with
high‐security
levels,
presenting
dynamic
display
encrypted
information.
In
this
study,
organohydrogel
fabricated
through
two‐step
interpenetrating
technique,
leading
co‐existence
naphthalimide
moieties
(DEAN,
green‐yellow
monomer)
contained
Poly(N,N‐dimethylacrylamide)
(PDMA)
hydrogel
network
and
Polyoctadecyl
methacrylate
(PSMA)
organogel
bearing
spiropyran
(SPMA,
photochromic
monomer).
Due
heterogeneous
networks,
fluorescence
goes
continuous
from
green
yellow
red
via
resonance
energy
transfer
(FRET)
process
extension
irradiation
time.
addition,
when
H
+
introduced
into
system,
SP
units
exhibit
transformation
protonated
merocyanine
(MCH
)
rather
than
(MC)
under
UV
light,
which
inhibits
FRET
process.
By
selectively
being
treated
,
can
act
as
an
effective
platform
encrypting
secret
information,
making
them
more
difficult
forge.
