Inorganic Chemistry,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Dec. 7, 2024
High-performance
near-infrared
(NIR)
light
sources
are
highly
sought
after
in
advanced
spectroscopy
techniques,
driving
the
development
of
NIR
phosphor-converted
light-emitting
diodes
(pc-LEDs).
Escalating
luminescence
intensity
and
thermal
stability
NIR-emitting
phosphors,
which
is
a
core
component
pc-LEDs,
paramount
importance.
Herein,
chemical
unit
cosubstitution
cosolvent
addition
tactics
were
implemented
to
simultaneously
boost
performance
synthesized
phosphors.
The
replacement
[Sc
Advanced Optical Materials,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Feb. 6, 2025
Abstract
The
encapsulation
of
phosphor
particles
into
a
silica
glass
(PiSG)
matrix
leads
to
the
formation
an
efficient
and
chemically
durable
spectral
converter,
which
is
promising
candidate
for
fabrication
stable
high‐power
phosphor‐converted
white
light‐emitting‐diodes
(pc‐wLEDs).
Here,
high‐throughput
transparent
PiSG
converters
based
on
Y
3
Al
5
O
12
:Ce
3+
,
Mg
2
4
Si
18
:Eu
2+
:Cr
demonstrated
via
injection
molding
followed
by
pressureless
sintering.
as‐fabricated
exhibits
broadband
emission
covering
visible
near‐infrared
(vis‐NIR)
regions
(i.e.,
500–900
nm)
with
high‐luminescence
efficiency
(>
85%)
high‐chemical
thermal
stabilities,
retaining
more
than
90%
its
intensity
at
200
°C.
Consequently,
pc‐vis‐NIR‐LEDs
(10
W)
are
manufactured
using
molded
converters,
showed
excellent
luminescence
performance
luminous
(LE)
=
115
Im
W
−1
correlated‐color‐temperature
(CCT)
4531
K,
color‐rendering‐index
(R
)
90.1
50
mA
input
power
0.45
W).
This
work
enables
LEDs
low
cost
outstanding
optical
properties,
making
spectral‐converter
favorable
device
lighting
bioimaging
applications.
Abstract
In
this
work,
the
high‐efficiency
broadband
garnet‐structured
NIR
phosphor,
CaMg
2
Sc
Ge
3
O
12
:Cr
3+
(CMSGO:Cr
),
has
been
synthesized
using
a
high‐temperature
solid‐phase
method.
Under
455
nm
excitation,
CMSGO:Cr
exhibits
red
to
near‐infrared
(NIR)
emission
with
an
ultra‐broad
range
of
600–1400
and
maximum
full
width
at
half
(FWHM)
273
nm.
The
Cr
ions
are
found
occupy
dodecahedral
octahedral
sites
in
CMSGO,
demonstrating
good
thermal
stability
375
K
maintaining
72%
that
room
temperature.
phosphor‐converted
light
emitting
diode
(pc‐LED)
combining
phosphor
460
chip
excellent
optical
performance,
output
power
80
mW@400
mA,
photoelectric
conversion
efficiency
15.69%@20
mA.
Furthermore,
vein
hand,
palm,
fingers,
wrist
can
be
clearly
observed
under
pc‐LED
device
from
phosphor.
food
testing
such
as
fish
fruit
is
operated
night
vision
improved
obviously.
All
results
demonstrate
candidate
for
rapid
medical
examination
imaging,
non‐destructive
testing,
vision.
Advanced Optical Materials,
Journal Year:
2025,
Volume and Issue:
unknown
Published: April 19, 2025
Abstract
Near‐infrared
(NIR)
phosphors
that
exhibit
high
quantum
efficiency
and
excellent
thermostability
are
of
critical
importance
for
the
development
NIR
light‐emitting
diodes
(LEDs)
with
substantial
output
power.
In
this
work,
Cr
3+
‐Ni
2+
codoping
Y
3
Ga
5
O
12
(YGAO)
a
internal
(IQE),
external
(EQE),
notable
thermal
stability
prepared
via
solid‐state
reactions.
When
excited
by
blue
light
at
437
nm,
YGAO:Cr
/Ni
demonstrate
broad
intense
emission
spanning
600–1100
nm
1200–1650
nm.
YGAO:3%Cr
/0.01%Ni
an
IQE
96.9%
EQE
37.5%,
whereas
YGAO:6%Cr
have
76.2%
36.3%.
The
luminescence
intensities
ions
423
K
show
zero
quenching
in
compared
to
those
303
K,
which
is
attributed
enhancement
effect
caused
electron
population
between
energy
levels
trap‐supplemented
luminescence.
LED
based
on
has
maximum
power
197.79
mW
under
1000
mA
operating
current.
Furthermore,
also
promising
potential
detection
functional
groups,
night
vision,
penetration.
Inorganic Chemistry,
Journal Year:
2024,
Volume and Issue:
64(1), P. 295 - 304
Published: Dec. 24, 2024
Thermal
quenching
(TQ)
of
luminescence
presents
a
significant
barrier
to
the
effective
use
optical
thermometers
in
high-temperature
applications.
Herein,
we
report
novel
uniaxial
negative
thermal
expansion
(NTE)
phosphor,
Y2–2x–2yMo4O15:xYb,yNd,
synthesized
by
solid-state
reaction.
Under
980
nm
laser
excitation,
it
exhibits
excellent
thermally
enhanced
near-infrared
(NIR)
upconversion
(UCL)
performance.
The
UCL
intensities
Nd3+
at
573
K
were
396-fold
(750
nm),
57.6-fold
(810
and
7.6-fold
(882
respectively,
compared
with
that
room
temperature.
In
situ
temperature-dependent
X-ray
diffraction
steady-
transient-state
spectra
are
used
reveal
behavior
mechanism
detail.
enhancement
NIR
is
attributed
synergistic
effect
increased
radiative
transition
probability
due
anisotropic
crystal
energy
transfer
(ET)
efficiency
resulting
from
shrinkage
phonon-assisted
process.
Based
on
intensity
ratio
(LIR)
coupled
levels
(4F7/2/4F3/2),
target
sample
achieved
ultrahigh
sensitivity
(Sr
=
3.0%
K–1
298
K)
high
repeatability
over
entire
temperature
range.
This
study
not
only
provides
fresh
perspective
for
achieving
phosphors
using
materials
but
also
approach
developing
outstanding
Abstract
Mn
5+
emission
is
a
promising
candidate
for
imaging
deep
tissue
structures
(e.g.,
vessels,
tumors)
in
the
second
near‐infrared
(NIR‐II,
1000–1350
nm)
region.
However,
its
practical
application
impeded
by
limited
quantum
efficiency
of
available
phosphors
due
to
unstable
valence
state
.
Herein,
novel
strategy
involving
site
competition
proposed
stabilize
introduction
valence‐unstable
Bi
2+/3+
The
results
demonstrate
that
3+
ions
tend
occupy
two
different
Ca
2+
ion
sites
within
6
Ba(PO
4
)
O
lattice.
incorporation
small
amount
effectively
suppresses
sites.
This
also
confirmed
spectroscopic
experiments
and
density
function
theory
calculations.
Notably,
an
ultra‐high
internal
82.3%
achieved
under
excitation
at
653
nm,
surpassing
more
than
twofold
previously
reported
value
37.5%
O:
As
proof
concept,
with
penetration
depth
≈2.8
cm
using
self‐produced
NIR‐II
light‐emitting
diodes
device
embedded
0.003Mn
/0.003Bi
powder.
These
findings
provide
valuable
insights
into
improving
luminescent
properties
associated
pave
way
high
spatiotemporal
resolution.
