ACS Nano,
Journal Year:
2024,
Volume and Issue:
18(48), P. 33097 - 33104
Published: Nov. 18, 2024
Hydrochromic
materials
undergo
magical
color
changes
when
interacting
with
water
and
are
receiving
widespread
attention
for
their
frontier
applications
such
as
sensing
information
security.
The
hydrochromic
effect
is
observable
in
perovskite
via
the
mechanism
of
water-induced
fluorescence
quenching.
However,
due
to
isolation,
achieving
a
perovskite-polymer
composite
remains
elusive,
notwithstanding
its
importance
potentially
commercial-ready
material.
Here,
we
demonstrate
perovskite-polymer-based
porous
nonsolvent-induced
phase
separation
method,
comprising
FA2PbBr4/poly(vinylidene
fluoride)
(FA
=
formamidinium).
naturally
formed
pores
serve
microchannels,
facilitating
moisture
diffusion.
penetrated
induces
transition
material
from
nonfluorescent
two-dimensional
FA2PbBr4
fluorescent
three-dimensional
FAPbBr3.
This
work
has
developed
composites,
enabling
various
chromatic
conceptually
demonstrated
custom-made
fingerprint
labels,
quick
response
code
anticounterfeiting
encrypted
document
protections,
water-ink
inkjet
printing.
Advanced Science,
Journal Year:
2024,
Volume and Issue:
11(24)
Published: April 16, 2024
Abstract
The
smart
materials
with
multi‐color
and
stimuli‐responsive
luminescence
are
very
promising
for
next
generation
of
optical
information
encryption
anti‐counterfeiting,
but
these
still
scarce.
Herein,
a
multi‐level
strategy
is
developed
based
on
the
polychromatic
emission
Sb‐doped
double
perovskite
powders
(SDPPs).
Cs
2
NaInCl
6
:Sb,
KInCl
AgInCl
:Sb
synthesized
through
coprecipitation
methods
exhibit
broadband
emissions
bright
blue,
cyan,
orange
colors,
respectively.
transmitted
by
specific
SDPP
encrypted
when
different
SDPPs
mixed.
confidential
can
be
decrypted
selecting
corresponding
narrowband
filter.
Then,
an
quick
response
(QR)
code
improved
security
demonstrated
this
multi‐channel
selection
strategy.
Moreover,
three
types
water‐triggered
switching
behaviors.
represented
erased/recovered
simple
water
spray/drying.
Whereas,
collected
from
green
channel
permanently
erased
moisture,
which
fundamentally
avoids
leakage.
Therefore,
schemes
designed
to
meet
variety
requirements.
multicolor
greatly
enrich
flexibility
encryption,
leaps
level
confidentiality.
Materials Horizons,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 1, 2025
A
self-erasing
luminescent
hydrogel
based
on
lanthanide–polyoxometalate
with
time-dependent
and
resilient
properties
was
developed
to
improve
the
level
of
information
security.
Materials Horizons,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 1, 2025
Given
that
optical
thermometers
are
widely
used
due
to
their
unique
advantages,
this
study
aims
address
critical
challenges
in
existing
technologies,
such
as
insufficient
sensitivity,
limited
temperature
measurement
ranges,
and
poor
signal
recognition
capabilities.
Herein,
we
develop
a
thermometer
based
on
the
fluorescence
intensity
ratio
(FIR)
of
Sb-doped
Cs2NaInCl6
(Cs2NaInCl6:Sb).
As
increases
from
203
323
K,
thermally
induced
transition
triplet
singlet
self-trapped
excitons
(STEs)
leads
enhanced
455
nm
photoluminescence
(PL)
STE
recombination.
Thus,
FIR
monotonically
depends
temperature,
allowing
for
sensing
with
high
absolute
sensitivity
(SA)
0.0575
K-1
maximum
relative
(SR)
1.005%
K-1.
We
demonstrate
spatial
distribution
can
be
measured
by
mapping
PL
spectra,
even
transparent
medium
screening
target.
Furthermore,
blue
emissive
Cs2NaInCl6:Sb
is
mixed
yellow
Cs2AgInCl6:Sb
thermal
quenching
feature.
The
color
mixture
dramatically
enabling
user-friendly
colorimetric
sensing.
Therefore,
two
operational
modes
proposed
meet
various
practical
application
demands.
Inorganic Chemistry,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Feb. 5, 2025
Multicolor
luminescent
materials
hold
great
potential
in
high-level
optical
anticounterfeiting
and
encryption
technologies.
However,
achieving
multiple
luminescence
a
single
phosphor
with
dopant,
especially
covering
visible
invisible
regions
simultaneously,
remains
standing
challenge.
Herein,
we
successfully
realize
dual-band
emission
single-doped
γ-AlON:Mn2+
phosphors.
Under
450
nm
light
excitation,
the
low-doped
γ-AlON:xMn2+
phosphors
(x
≤
0.02)
emit
narrowband
green
at
515
nm;
however,
when
further
increasing
Mn2+
concentration,
heavy-doped
≥
0.05)
samples
display
an
additional
broad
near-infrared
band
peaking
730
nm.
Such
intriguing
spanning
from
to
regimes
is
assigned
combined
emissions
of
isolated
tetrahedral
ions
superexchange-coupled
Mn2+-Mn2+
pairs
γ-AlON
host.
Exploiting
distinct
photoluminescence
low-
high-doped
phosphors,
double-level
information
demonstration.
This
work
first
presents
dual-emission
not
only
enabling
but
also
shedding
on
tuning
inorganic
Advanced Functional Materials,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Feb. 10, 2025
Abstract
Recently,
lead‐free
double
perovskites
have
gained
much
attention
for
their
superior
optoelectronic
properties.
However,
realizing
efficient
white
light
and
near‐infrared
(NIR)
emission,
as
well
bright
radioluminescence
(RL)
in
a
single
compound
has
not
yet
been
reported.
Herein,
Bi
3+
/Mo
4+
‐codoped
Cs
2
Ag
0.6
Na
0.4
InCl
6
perovskite
is
synthesized
by
hydrothermal
reaction.
Under
photoexcitation,
the
codoped
exhibits
highly
broadband
warm‐white
emission
(610
nm)
NIR
(930
nm),
which
can
be
attributed
to
self‐trapped
exciton
of
d–d
transition
Mo
,
respectively.
Interestingly,
also
emits
strong
with
yield
25100
photons
per
MeV
under
X‐ray
irradiation.
Based
on
/PDMS
flexible
film,
its
applications
emitting
diodes
(WLED),
source,
scintillator
are
demonstrated,
respectively,
all
exhibit
remarkable
Finally,
as‐fabricated
devices
light,
NIR,
imaging
further
demonstrated
pixel‐level
image
fusion
realized
without
pixel
mismatch
complex
processing.
Therefore,
internal
information
capsule
wrapped
centrifuge
tube
iron
wire
successfully
through
fusion.
