Advanced Optical Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Sept. 14, 2024
Abstract
Mechanoluminescence
(ML)
refers
to
the
luminescence
phenomenon
that
occurs
when
a
material
is
under
external
mechanical
stimuli.
However,
relying
solely
on
stress
information
obtain
ML
signals
prone
test
errors
in
complex
conditions.
In
this
work,
Tb
3+
/Eu
‐doped
Lu
3
Al
2
Ga
O
12
multicolor
reported,
which
color
can
be
adjusted
from
white
red
(CIE
coordinates:
(x
=
0.313,
y
0.3293)
0.6183,
0.379))
by
changing
Eu
concentration.
addition,
LAGO:
0.25%
and
1.5%
are
physically
mixed
at
different
mass
ratios,
varied
stimuli‐responsed
emission
characteristics
of
ions
used
develop
temperature
dual
sensing
device.
Stress
further
reflected
simultaneously
through
blue/red
ratio
I
R
(I
/I
).
As
increases,
changes
0.3259,
0.306)
0.4707,
0.3625)),
relative
sensitivity
(Sr)
as
high
1.209%
K
−1
298
K.
This
device
provides
new
idea
for
potential
structural
safety
monitoring,
multi‐modal
anti‐counterfeiting
technology,
etc.
ACS Applied Materials & Interfaces,
Journal Year:
2024,
Volume and Issue:
16(27), P. 35279 - 35292
Published: June 27, 2024
Mechanoluminescence
(ML)
is
the
nonthermal
luminescence
generated
in
process
of
force-to-light
conversion,
which
has
broad
prospects
stress
sensing,
wearable
devices,
biomechanics,
and
multiple
information
anticounterfeiting.
Multivalence
emitter
ions
utilize
their
own
self-reduction
to
realize
multiband
ML
without
introducing
another
dopant,
such
as
Eu3+/Eu2+,
Sm3+/Sm2+,
Mn4+/Mn2+.
However,
self-reduction-induced
bismuth-activated
materials
rarely
been
reported
so
far.
In
this
work,
a
novel
visible-to-near-infrared
(vis-NIR)
induced
by
Bi3+
Bi2+
spinel-type
compound
(MgGa2O4)
reported.
The
photoluminescence
(PL)
spectra,
PL
excitation
(PLE)
lifetime
curves
demonstrate
that
Bi3+/Bi2+
are
main
centers.
Notably,
possible
model
proposed,
where
magnesium
vacancy
(VMg″)
considered
driving
force
for
Bi2+.
Furthermore,
an
oxygen
(VO••)
confirmed
electron
paramagnetic
resonance
(EPR)
spectroscopy.
Combined
with
thermoluminescence
(TL)
glow
plausible
trap-controlled
mechanism
illustrated,
electron-hole
(VO••/VMg″)
pairs
play
significant
role
capturing
electrons
holes.
It
worth
noting
proof-of-concept
dual-mode
electronic
signature
application
implemented
based
on
flexible
film,
improves
capabilities
anticounterfeiting
high-level
security
applications.
Besides,
multistimulus-responsive
behaviors
film
realized
under
254
nm
UV
lamp,
thermal
disturbance,
980
laser,
mechanical
stimuli.
general,
study
provides
new
insights
into
designing
vis-NIR
toward
wider
possibilities.
Small,
Journal Year:
2024,
Volume and Issue:
20(45)
Published: Aug. 10, 2024
Mechanoluminescence
(ML)
phosphors
have
found
various
promising
utilizations
such
as
in
non-destructive
stress
sensing,
anti-counterfeiting,
and
bio
imaging.
However,
the
reported
NIR
MLs
predominantly
been
limited
to
bulky
particle
size
weak
ML
intensity,
hindering
further
practical
applications.
For
this
regard,
a
nano-sized
ZnGa
Advanced Science,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Nov. 27, 2024
Abstract
Strain
sensors
utilizing
mechanoluminescent
(ML)
materials
have
garnered
significant
attention
and
application
due
to
their
advantages,
such
as
self‐powering,
non‐contact
operation,
real‐time
response.
However,
ML‐based
strain
sensing
techniques
typically
rely
on
the
establishing
of
a
mathematical
relationship
between
ML
intensity
mechanical
parameters.
The
absolute
is
vulnerable
environmental
factors,
which
can
result
in
measurement
errors.
Herein,
an
color‐resolved
visualized
dynamic
self‐referencing
investigated
Ca
9
Al(PO
4
)
7
:
Tb
3+
,
Mn
2+
.
By
analyzing
performance
under
various
stimulations
adjustable
parameters,
ratio
/Mn
aimed
bed
established.
This
will
enable
development
technology.
Through
comparison
luminescence
characteristics
continuous
stimulation
(stretching)
X‐ray
irradiation,
it
discovered
that
ratiometric
primarily
driven
by
filling
release
carriers
form
traps,
compensates
for
Leveraging
(from
green
red)
characteristics,
scenario
monitoring
human
joint
movement
developed.
approach
offers
new
insights
into
use
human‐machine
interaction.
Small,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Feb. 16, 2025
Abstract
A
series
of
Sr
2‐x
Ga
2
GeO
7
:
x
Tb
3+
(0
mol%
≤
10
mol%)
phosphors
exhibiting
persistent
luminescence
is
synthesized
via
a
high‐temperature
solid‐state
reaction.
Structural
analysis
and
phase
identification
are
conducted
using
X‐ray
powder
diffraction
Rietveld
refinement.
The
reflectance
spectra
revealed
that
the
phosphor
exhibited
direct
bandgap
with
value
4.99
eV.
photoluminescence
excitation
displayed
broad
absorption
bands
corresponding
to
4f
8
→
5d
1
transition
ion,
along
narrow‐band
peaks
attributed
4f‐4f
transitions.
emission
featured
resulting
from
transitions
excited
energy‐state
(
5
D
3
/
4
)
ground‐state
levels
F
J
).
Among
these
transitions,
dominant,
producing
green
phosphor.
Concentration
quenching
observed,
radiative
reabsorption
process.
Additionally,
demonstrated
thermal
stability
up
675
K.
kinetic
scan
afterglow
measurements
showed
lifetime
≈7000
s,
persistence
100
s.
Thermoluminescence
besides
intrinsic
defect,
doping
introduced
interstitial
vacancy
defects
contributed
improving
practical
application
for
latent
fingerprint
detection
anticounterfeiting
applications.
Abstract
Owing
to
their
unique
characteristic
of
direct
mechanical‐to‐optical
energy
conversion,
mechanoluminescence
(ML)
crystals
have
drawn
considerable
interest
for
visible
stress
sensing,
flexible
and
stretchable
displays,
advanced
anti‐counterfeiting.
However,
among
the
emissions
synthetic
ML
materials,
high‐performance
red‐emission
semiconductors
with
ideal
color‐rendering
indices
are
relatively
scarce,
which
restricts
future
applications.
In
this
work,
red
emission
CIE
coordinates
(0.6395
0.3572)
in
Mn‐doped
ZnGa
2
S
4
prepared
by
a
molten
salt
shielding
synthesis
method
air
is
reported.
has
cubic
crystal
structure
composed
layered
[ZnS
]
tetrahedral
unit
that
plays
an
important
role
efficient
ML.
Based
on
density
functional
theory
calculations,
relationship
between
performance
revealed,
will
help
development
new
high‐quality
materials.
The
Mn‐doping
causes
slight
deformation
structure,
leading
band
bending
formation
features
response
mechanical
stimuli.
deep‐red
:Mn
holds
great
promise
stable
displays
force/pressure
sensor
