Advanced Optical Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Апрель 21, 2025
Abstract
Near‐infrared
second
region
(NIR‐II,
1000–1600
nm)
has
deeper
penetration
depth,
higher
sensitivity,
and
spatial
resolution
than
NIR
first
(NIR‐I,
700–1000
nm).
However,
Cr
3+
Ni
2+
‐doped
NIR‐I/NIR‐II
phosphor
with
serious
pollution
toxicity
issues
pose
limitations
for
the
application
of
these
phosphors.
Here,
Fe
Cs
2
NaLuCl
6
is
reported
by
grinding‐sintering
method,
which
shows
broadband
emission
in
range
nm
a
FWHM
≈309
nm,
while
PLQY
as
17.29%,
under
395
excitation.
The
unique
this
originates
from
activation
center
located
an
environment
extremely
weak
octahedral
crystal
field
provided
lattice.
A
pc‐LED
device
assembled
optimal
encapsulated
commercially
available
ultraviolet
LED
chip.
Which
output
23.5
mW
electro‐optical
conversion
efficiency
6.53%
100
mA
driving
current,
potential
demonstrated
night
vision,
bio‐imaging,
large‐scale
detection,
information
anti‐counterfeiting
high‐resolution
imaging.
Inorganic Chemistry,
Год журнала:
2025,
Номер
unknown
Опубликована: Фев. 2, 2025
Metal
halide
double
perovskites
with
splendid
optical
features
have
been
considerably
investigated
for
optoelectronic
applications.
Herein,
a
series
of
Mn2+-doped
Cs2NaLuCl6
perovskite
crystals
were
prepared.
Via
adopting
the
density
functional
theory
calculation,
effect
Mn2+
doping
on
electronic
structure
compound
was
discussed.
It
found
that
crystal
can
emit
intense
blue
light
from
host
self-trapped
exciton
(STE)
emission.
Excited
by
320
nm,
STE
and
emissions
simultaneously
observed
in
resulting
crystals.
Owing
to
efficient
energy
transfer
Mn2+,
polychromatic
luminescence
final
products.
Moreover,
taking
advantage
various
responses
emission
intensities
temperature,
thermometric
characteristics
investigated,
their
maximum
relative
sensitivity
is
0.99%
K-1,
which
hardly
impacted
content.
Furthermore,
prepared
exhibit
good
X-ray
radioluminescence
properties,
low
detection
limitation
0.99
μGyair
s-1.
Additionally,
utilizing
designed
crystal,
flexible
imaging
high
resolution
20
lp
mm-1
be
operated
high-temperature
environment
realized.
These
results
indicated
are
suitable
thermometry
imaging.
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.
ACS Applied Materials & Interfaces,
Год журнала:
2024,
Номер
16(44), С. 60599 - 60607
Опубликована: Окт. 22, 2024
Near-infrared
phosphor-converted
light-emitting
diodes
(NIR
pc-LEDs)
as
a
new
NIR
light
source
has
outstanding
application
potential
in
the
fields
of
spectroscopy
analysis,
sensing,
imaging,
and
pattern
recognition.
Therefore,
development
phosphors
with
good
luminescence
thermal
stability
attracted
much
attention.
To
this
end,
we
developed
LiAlO2:Cr3+
garnet-type
by
high-temperature
solid-state
reaction
method.
Under
405
nm
excitation,
Cr3+
ions
located
tetrahedrons
LiAlO2
emit
emission
broadband
that
covers
650-900
mixed
several
sharp
narrowband
R-line
emissions,
which
showed
excellent
integrated
intensity
measured
at
573
K
is
∼90.86%
303
caused
structural
rigidity
low
expansion
coefficient
matrix
material.
An
pc-LED
device
assembled
optimized
commercially
available
purple
LED
chip
emitted
output
power
∼98.172
mW
driving
current
300
mA
demonstrated
an
electro-optical
conversion
efficiency
∼9.09%,
while
it
night
vision
monitoring
biomedical
imaging.
Inorganic Chemistry,
Год журнала:
2025,
Номер
unknown
Опубликована: Май 24, 2025
With
the
rapid
development
of
markets
and
economies,
various
brands
have
raised
higher
demands
for
optical
anticounterfeiting
technology.
Lead-free
halide
double
perovskites
with
broadband
self-trapped
exciton
emission
excellent
properties
such
as
good
visibility,
diverse
colors,
simple
designs,
making
them
outstanding
materials
information
encryption
applications.
In
this
study,
we
successfully
synthesized
lead-free
dual
centers
by
doping
Sb3+
Cr3+
into
Cs2NaScCl6.
The
blue
(445
nm)
originates
from
[SbCl6]3-
octahedra,
while
near-infrared
(980
comes
luminescence
ions.
achieved
a
quantum
efficiency
up
to
71%
through
efficient
energy
transfer
among
multiple
centers.
Finally,
patterns
were
realized
screen
printing
samples.
research
results
provide
inspiration
designing
tunable
luminescent
properties.
Abstract
In
phosphor‐converted
light‐emitting
diode
(pc‐LED)‐based
near‐infrared
light
sources
for
biochemical
analysis
and
medical
diagnostics,
phosphors
with
broadband
(NIR)
emission
play
an
important
role,
obtaining
such
is
a
great
challenge.
Herein,
efficient
NIR‐emitting
Zn
2
Ga
0.5‐y
Al
y
Sb
0.5
O
4
:Cr
3+
are
developed
by
introducing
to
gradually
replace
in
the
host
through
crystal
engineering.
Spectral
densitometric
calculations
show
that
this
homogeneous
cation
substitution
strategy
optimizes
local
lattice
environment
significantly
suppresses
nonradiative
relaxation
of
Cr
centers,
thus
exhibiting
strong
NIR
properties.
addition,
ions
varied
low‐temperature
emissions
notable
temperature
sensitivity
differences
among
centers.
At
90
K,
material
achieves
maximum
relative
1.45%
K
−1
,
highlighting
its
potential
as
thermosensitive
applications
sensing.
The
LED
source
fabricated
based
on
shows
significant
response
different
liquids
transmission
spectral
analysis,
suggesting
identification
organic
compounds.
ACS Applied Materials & Interfaces,
Год журнала:
2025,
Номер
17(19), С. 28366 - 28373
Опубликована: Май 6, 2025
Near-infrared
phosphor-converted
light-emitting
diodes
(NIR
pc-LEDs),
a
widely
used
NIR
light
source,
are
typically
prepared
by
sealing
the
phosphor
powder
and
an
LED
chip
with
epoxy
resin.
One
issue
that
pc-LEDs
frequently
encounter
is
aging
deterioration
of
resin
over
time,
which
leads
to
self-absorption
sharp
decline
in
emission
efficiency.
Here,
we
report
synthesis
chemically
stable
luminescent
material
composed
Cr3+-doped
Ba2NaNb5O15
nanocrystals
measuring
10-15
nm,
Cr3+
ions
located
octahedral
centers
nanocrystals.
Under
460
nm
excitation,
transparent
glass-ceramic
exhibited
broadband
range
600-1400
originated
from
electronic
transition
excited
state
4T2
ground
4A2.
The
peak
was
at
∼810
FWHM
∼230
internal
quantum
efficiency
reached
∼0.81%.
We
constructed
pc-LED
device
using
optimized
NIR-emitting
glass-ceramics
commercially
available
blue
chip,
demonstrating
its
promising
application
night-vision
lighting.
Our
study
provides
basis
for
preparation
glass-ceramic-based
devices
as
improved
alternative
solid-state
illumination.