ACS Applied Materials & Interfaces,
Год журнала:
2024,
Номер
16(46), С. 63831 - 63839
Опубликована: Ноя. 12, 2024
Near-infrared
(NIR)
light
allows
fast
and
nondestructive
detection
with
deep
penetration
into
biological
tissues
is
widely
used
in
food
inspection,
biomedical
imaging,
night
vision
security,
other
fields.
Cr3+-doped
NIR
first
region
(NIR-I)
phosphors
have
many
interesting
features
that
attracted
a
lot
of
attention
recently.
However,
practical
issues,
such
as
low
photoluminescence
quantum
efficiency
poor
thermal
stability,
need
to
be
addressed.
We
synthesized
Lu2SrAl4SiO12
garnet-type
using
high-temperature
solid-state
reaction
method.
Under
blue-light
(@
430
nm)
excitation,
the
exhibited
broadband
NIR-I
emission
range
600–1000
nm,
an
peak
at
710
nm.
This
system
unique,
had
multipeak
sharp-line
superposition
Cr3+
ions
were
situated
relatively
strong
crystal
field
environment,
opposed
weak
environment
for
matrix.
The
optimal
doping
content
was
2
mol
%,
its
internal
∼76.8%.
Surprisingly,
this
phosphor
showed
antithermal
quenching
effect,
integrated
luminescence
intensity
measured
573
K
206.3%
303
K.
found
caused
by
extremely
expansion
coefficient
rigid
structure
matrix
temperature
range,
well
weakening
electron–phonon
coupling
increasing
temperature.
optimized
packaged
blue
chip
phosphor-converted
light-emitting
diode
device.
source
device
output
power
119.02
mW
electro-optical
conversion
11.02%
under
driving
current
300
mA.
application
potential
demonstrated
high-resolution
imaging.
Laser & Photonics Review,
Год журнала:
2024,
Номер
18(8)
Опубликована: Март 20, 2024
Abstract
The
performance
of
the
near‐infrared
phosphor‐converted
light‐emitting
diodes
(NIR
pc‐LEDs)
mainly
depends
on
NIR
emitting
phosphors
used.
Cr
3+
doped
materials
can
be
excited
by
blue
light
chips,
but
their
emission
is
located
in
NIR‐I
region
(650–1000
nm).
Ni
2+
are
NIR‐II
(1000–1700
nm),
they
cannot
effectively
chips.
Herein,
,
mono‐doped,
and
co‐doped
Sr
2
GaTaO
6
prepared
investigated.
ions
occupy
two
octahedral
sites
Ga
Ta
5+
.
co‐doping
has
achieved
breakthroughs.
One
to
shift
optimal
excitation
wavelength
from
violet
due
energy
transfer
(efficiency
up
70%)
other
achieve
broadband
continuous
across
regions
(650–1700
nm,
with
a
full
width
at
half
maximum
(FWHM)
410
nm
(173
+
237
nm)).
:
0.02Cr
0.01Ni
phosphor
combined
commercial
460
chip
realize
its
application
organic
compounds
identification,
night
vision,
biological
imaging.
This
work
points
out
direction
for
future
development
efficient
super
NIR‐emitting
phosphors.
Abstract
Near‐infrared
(NIR)
luminescent
metal
halide
(LMH)
materials
have
attracted
great
attention
in
various
optoelectronic
applications
due
to
their
low‐temperature
solution‐processable
synthesis,
abundant
crystallographic/electronic
structures,
and
unique
properties.
However,
some
challenges
still
remain
luminescence
design,
performance
improvement,
application
assignments.
This
review
systematically
summarizes
the
development
of
NIR
LMHs
through
classifying
origins
into
four
major
categories:
band‐edge
emission,
self‐trapped
exciton
(STE)
ion
defect‐related
emission.
The
mechanisms
different
types
are
discussed
detail
by
analyzing
typical
examples.
Reasonable
strategies
for
designing
optimizing
luminescence/optoelectronic
properties
summarized,
including
bandgap
engineering,
self‐trapping
state
chemical
composition
modification,
energy
transfer,
other
auxiliary
such
as
improvement
synthesis
scheme
post‐processing.
Furthermore,
prospects
based
on
devices
revealed,
phosphor‐converted
light‐emitting
diodes
(LEDs),
electroluminescent
LEDs,
photodetectors,
solar
cells,
x‐ray
scintillators,
well
demonstrations
related
practical
applications.
Finally,
existing
future
perspectives
LMH
critically
proposed.
aims
provide
general
understanding
guidance
design
high‐performance
materials.
image
Inorganic Chemistry,
Год журнала:
2024,
Номер
63(14), С. 6555 - 6563
Опубликована: Март 26, 2024
Near-infrared
(NIR)
phosphor
conversion
light-emitting
diodes
(pc-LEDs)
have
great
application
potential
as
NIR
light
sources
in
many
fields
such
food
analysis,
night
vision
illumination,
and
bioimaging
for
noninvasive
medical
diagnosis.
In
general,
phosphors
synthesized
by
a
high-temperature
solid-phase
method
large
particle
sizes
to
be
processed
fine
powders
grinding
process,
which
may
introduce
surface
defects
lower
the
luminous
efficiency.
Here,
we
report
sol–gel
sintering
with
ammonium
nitrate
citric
acid
sacrificing
agents
synthesize
high
purity,
nanosized
(less
than
50
nm)
Zr4+/Ni2+
codoped
MgAl2O4
spinel
phosphors,
is
matrix,
Ni2+
center,
Zr4+
acts
charge
compensator.
We
systematically
characterized
crystal
structures
luminescence
properties
of
Ni2+-doped
MgAl2O4.
Under
390
nm
excitation,
emission
spectrum
covers
900–1600
nm,
half-peak
width
251
peak
position
located
at
1230
nm.
demonstrated
that
incorporating
small
amounts
compensator,
intensity
was
doubled
over
phosphor.
The
optimal
content
compensator
2
mol
%.
More
importantly,
inclusion
led
improved
thermal
stability
properties,
measured
100
°C
33.83%
room
temperature
(20
°C).
This
study
demonstrates
nanomaterials
high-purity
enhanced
optical
can
designed
through
compensation
strategy
method.
Laser & Photonics Review,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 29, 2025
Abstract
Achieving
ultra‐broadband
absorption
and
enhancing
the
near‐infrared
(NIR)
emitting
properties
of
NIR
phosphors
is
a
key
challenge
to
realize
its
multiple
applications,
such
as
solar
spectrum
conversion,
spectral
analysis,
night
vision.
Here,
novel
phosphor
system
MTiTaO
6
:
Cr
3+
(
M
=
Al
,
Ga
Sc
),
with
an
excitation
broad
421
nm
enhanced
emission
reported.
It
widest
among
known
‐doped
phosphors.
Structural
spectroscopic
analysis
shows
that
originates
from
overlap
luminescence
centers.
Additionally,
peak
red‐shifted
816
871
increasing
ion
radius,
intensity
enhanced,
which
not
only
makes
spectra
more
compatible
response
curve
c‐Si
cells,
but
also
gives
it
advantage
in
spectroscopy
applications.
Comparison
water
alcohol
demonstrate
promising
ACS Materials Letters,
Год журнала:
2024,
Номер
6(10), С. 4555 - 4563
Опубликована: Сен. 3, 2024
Presently,
there
are
very
limited
options
for
a
broad-band
long-wavelength
near-infrared
phosphor-converted
light-emitting
diode
(LWNIR
pc-LED)
with
wavelengths
above
∼1500
nm,
and
most
LWNIR
phosphors
have
low
luminescence
quantum
efficiency.
Here,
Ni2+-doped
MgIn2O4
antispinel
were
prepared
by
high-temperature
solid-state
reaction
method.
Under
365
nm
excitation,
they
exhibited
emission
in
the
range
of
1200–2100
an
peak
∼1490
full
width
at
half-maximum
∼313
indicating
weak
crystal
field
environment
high
electron
polarization
around
center
[MgO6]
octahedron.
The
IQE
EQE
MgIn2O4:Ni2+
∼47.93%
∼34.66%,
respectively.
optimized
phosphor
was
encapsulated
LED
chip
to
obtain
pc-LED
device
night
vision
lighting,
nonvisual
detection,
biological
imaging.
Our
results
confirmed
that
lighting
based
imaging
technology
showed
clear
safety
advantages
over
traditional
high-energy
ray
