Chemistry of Materials,
Journal Year:
2019,
Volume and Issue:
31(23), P. 9887 - 9894
Published: Nov. 15, 2019
Compared
to
fluorescence
imaging
with
short-lived
emissive
probes,
the
use
of
phosphorescent
probes
conveys
advantage
long
signal
persistance
in
time
and
this
permits
one
discriminate
against
interference
from
autofluorescence.
However,
realization
room
temperature
phosphorescence
(RTP)
that
feature
ultralong
emission
lifetimes
aqueous
solution
is
still
a
challenge.
Here,
we
present
rational
strategy
for
realizing
RTP
air-saturated
media
carbon
dot-based
silica
composites
(CDs@SiO2)
which
as
1.64
s.
The
excellent
properties,
their
small
size,
water
solubility
make
CDs@SiO2
promising
material
biological
application.
We
demonstrate
efficient
reporters
both
plant
tissue
animal
cells
where
strong
autofluorescence
poses
severe
challenge
conventional,
short-lifetime
probes.
Advanced Materials,
Journal Year:
2019,
Volume and Issue:
32(18)
Published: June 24, 2019
Abstract
Optical
nanomaterials
have
been
widely
used
in
anticounterfeiting
applications.
There
significant
developments
powered
by
recent
advances
material
science,
printing
technologies,
and
the
availability
of
smartphone‐based
decoding
technology.
Recent
progress
this
field
is
surveyed,
including
optical
reflection,
absorption,
scattering,
luminescent
nanoparticles.
It
demonstrated
that
design
synthesis
lanthanide‐doped
upconversion
nanoparticles
will
lead
to
next
generation
technologies.
Their
tunable
properties
responses
a
range
external
stimuli
allow
high‐security
level
information
encoding.
Challenges
scale‐up
nanomaterials,
engineering
assessorial
devices
for
smart‐phone‐based
decryption,
alignment
potential
markets
which
new
directions
research,
are
discussed.
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
Nanoscale,
Journal Year:
2019,
Volume and Issue:
11(11), P. 4634 - 4652
Published: Jan. 1, 2019
Carbon
quantum
dots
(CDs)
are
a
relatively
new
class
of
carbon
nanomaterials
which
have
been
studied
very
much
in
the
last
fifteen
years
to
improve
their
already
favorable
properties.
The
optical
properties
CDs
drawn
particular
interest
as
they
display
unusual
trait
excitation-dependent
emission,
well
high
fluorescence
yields
(QY),
long
photoluminescence
(PL)
decay
lifetimes,
and
photostability.
These
qualities
naturally
lead
researchers
apply
field
imaging
(particularly
bio-imaging)
sensing.
Since
amount
publications
regarding
has
growing
nearly
exponentially
ten
years,
many
improvements
made
such
QY
PL
lifetime.
However,
great
deal
confusion
remains
mechanism
structural
Therefore,
presented
this
review
is
summary
discussion
QYs
lifetimes
reported
recent
years.
effect
method
precursor
evaluated
discussed
appropriately.
current
theories
discussed,
with
special
attention
concept
surface
state-controlled
PL.
With
knowledge,
improvement
preparation
applications
related
will
be
easily
accomplished.
Further
can
through
understanding
Angewandte Chemie International Edition,
Journal Year:
2019,
Volume and Issue:
58(22), P. 7278 - 7283
Published: March 29, 2019
Carbon
dots
(CDs)
have
attracted
attention
in
metal-free
afterglow
materials,
but
most
CDs
were
heteroatom-containing
and
the
emissions
are
still
limited
to
short-wavelength
region.
A
universal
approach
activate
room-temperature
phosphorescence
(RTP)
of
both
heteroatom-free
was
developed
by
one-step
heat
treatment
boric
acid
(BA).
The
introduction
an
electron-withdrawing
boron
atom
composites
can
greatly
reduce
energy
gap
between
singlet
triplet
state;
formed
glassy
state
effectively
protect
excited
states
from
nonradiative
deactivation.
host
for
embedding
achieve
long-lifetime
multi-color
(blue,
green,
green-yellow
orange)
RTP
via
a
low
cost,
quick
facile
process
developed.
Based
on
their
distinctive
performances,
applications
these
CD-based
materials
information
encryption
decryption
also
proposed
demonstrated.
