Optics Letters,
Journal Year:
2024,
Volume and Issue:
50(2), P. 634 - 634
Published: Dec. 17, 2024
Near-infrared
(NIR)
phosphor-converted
light-emitting
diode
(pc-LED)
has
emerged
as
the
most
promising
NIR
light
source,
highlighting
importance
of
exploring
phosphors
with
excellent
efficiency
and
sufficient
spectral
coverage.
Herein,
a
garnet
Na
2
CaHf
Ge
3
O
12
:Cr
3+
phosphor
an
internal
quantum
(IQE)
79.2%
been
developed,
which
exhibits
relatively
long
wavelength
emission
peak
at
830
nm
full
width
half
maximum
(FWHM)
144
nm.
Moreover,
can
be
gradually
tuned
to
903
intensity
maintaining
over
60%
utilizing
chemical
unit
co-substitution
strategy.
Thus,
developed
material
in
this
work
wide-range
tunability,
being
for
multifunctional
spectroscopy
applications.
Small,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Feb. 4, 2025
Abstract
The
pursuit
of
broadband
near‐infrared
(NIR)
phosphors
for
next‐generation
smart
NIR
light
sources
has
garnered
extensive
interest.
However,
developing
efficiently
excitable
by
blue
to
produce
thermally
stable
and
highly
efficient
emission
surpassing
830
nm
remains
a
formidable
challenge.
Herein,
novel
CaGd
2
Ga
4
SiO
12
garnet
is
reported,
designed
through
structure
reconstruction
approach
host
Cr
3+
ions
high‐performance
phosphor.
By
strategically
introducing
Jahn–Teller
distortion
at
the
octahedral
sites
via
chemical
pressure,
endowed
with
super‐broadband
spanning
600–1300
centered
837
nm.
full‐width
half
maximum
(FWHM)
varies
from
187
223
across
doping
concentrations,
highest
internal
quantum
efficiency
(IQE)
99.01%.
Remarkable
luminescence
thermal
stability
(90.37%@423
K)
bolstered
weak
electron‐phonon
coupling
(EPC)
effect
trap‐mediated
energy
compensation,
result
heterovalent
ion
substitutions
in
dodecahedral
tetrahedral
sites.
Furthermore,
prototype
phosphor‐converted
light‐emitting
diode
(pc‐LED)
fabricated,
delivering
substantial
output
power
287.7
mW
1100
mA
conversion
(PCE)
24.4%
30
mA,
enabling
impressive
performance
versatile
applications,
including
component
analysis,
non‐destructive
testing,
imaging,
night
vision.
Abstract
Eu
3+
‐activated
red‐emitting
inorganic
phosphors
have
been
favored
highly
for
their
classical
5
D
0
→
7
F
J
(J
=
0,
1,
2,
3,
4)
emissions.
However,
the
fatal
drawbacks
of
poor
luminous
efficacy
and
weak
4
transition
persist,
resulting
in
ongoing
challenge
achieving
far‐red
emission.
This
research
reports
series
efficient
LnTeBO
(Ln
La
,
Y
Gd
):Eu
with
anomalously
strong
transition,
from
distorted
square
antiprism
[Ln/EuO
8
].
Both
thermal
stability
can
be
greatly
enhanced
via
simple
composition
variation.
]
antiprism‐triggered
2,4
transitions
are
elucidated
depth,
acquiring
ultra‐high
(IQE
95%,
EQE
40%,
AE
42%)
near‐zero
quenching
(99%@150°C
98%@200°C).
Subsequently,
versatile
utilizations
indoor
lighting,
plant
growth
security
ink
illustrated.
finding
establishes
a
deep
understanding
constructing
high‐quality
‐centered
structural
units
antiprism.
Advanced Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Nov. 3, 2024
Abstract
Ultrabright
broadband
near‐infrared
(NIR)
phosphor‐converted
laser
diode
(pc‐LD)
as
a
light
source
is
increasingly
essential
for
improving
the
sensitivity
and
spatial
resolution
of
intelligent
NIR
spectroscopy
technologies.
However,
performance
pc‐LD
greatly
hindered
by
low
external
quantum
efficiency
(EQE)
poor
thermal
resistance
phosphor
materials.
Herein,
highly
stable
phosphor‐in‐ceramic
(PiC)
film
deposited
on
high
conductivity
substrate,
in
which
NIR‐emitting
Ca
3
MgHfGe
O
12
:Cr
3+
incorporated
into
glass‐crystallized
Ga
2
Ge
ceramic
matrix,
along
with
formation
new
type
PiC
composite
material
efficiency,
absorbance,
conductivity,
designed
prepared.
The
obtained
exhibits
an
impressive
EQE
57.7%,
17.1
W
m
−1
K
,
wheel
demonstrates
emission
exceeding
5
when
excited
450
nm
laser.
Finally,
groundbreaking
electrically
driven
device
based
achieves
1.6
output,
enabling
multiple
applications
archaeology
night
vision
imaging.
This
work
paves
way
advancing
sources
diverse
range
photonic
applications.
Abstract
Near‐infrared
(NIR)
phosphors
are
a
vital
component
of
phosphor‐converted
light‐emitting
diodes
(pc‐LEDs),
with
simultaneous
high
quantum
efficiency
and
thermal
stability
being
essential
attributes
for
optimal
performance.
In
this
paper,
novel
ZnAlB
(1‐
x
)
Ga
O
4
:0.05Cr
3+
system
is
designed
by
gradually
substituting
B
Ga.
Surprisingly,
significant
enhancement
in
photoluminescence
performance
observed,
reaching
peak
at
=
1.
Further
development
led
to
series
ZnAlGaO
:
y
Cr
(ZAGO:
phosphors,
exhibiting
variable
full
width
half
maximum
(FWHM)
ranging
from
32
163
nm
increasing
content,
attributed
energy
transfer
between
two
emission
centers.
Among
these,
ZAGO:0.05Cr
emerges
as
the
phosphor,
boasting
internal/external
80%/34%
FWHM
80
nm.
Notably,
phosphor
demonstrates
anti‐thermal
quenching
behavior
(125.53%
@
423
K),
its
exceptional
elucidated
through
defect
level
model.
The
fabricated
NIR
pc‐LEDs
featuring
ZAGO:Cr
show
great
prospect
multifunctional
applications
plant
cultivation,
night
vision,
non‐destructive
analysis
veins
imaging.
Inorganic Chemistry,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Feb. 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.
Abstract
Long‐wavelength
near‐infrared
(NIR)
phosphors
(1000–2000
nm)
have
shown
great
promise
in
intelligent
NIR
spectroscopy
technology
fields.
However,
developing
capable
of
directly
absorbing
blue
light
and
emitting
over
1000
nm
still
remains
a
significant
challenge.
Here,
series
ultra‐broadband
with
emission
peaks
longer
than
1500
is
achieved
by
incorporating
single
activator
Ni
2+
ion
into
ALaMgMO
6
(A
=
Ca,
Sr,
Ba;
M
Sb,
Nb,
Ta)
double
perovskite
hosts.
Significantly,
through
composition
modulation
strategy,
the
designed
exhibit
an
intense
absorption
band
centered
at
440
nm,
making
these
mono‐doped
pumped
commercial
LED
chips
without
strictly
introducing
sensitized
ions
or
energy
transfer
process.
The
origination
effective
blue‐light
excitable
NIR‐II
to
NIR‐III
phosphor
unraveled
Rietveld
structural
refinement
local
symmetry
analysis.
Additionally,
developed
demonstrated
potential
spectroscopic
analysis,
night‐vision
technology,
non‐destructive
visualization,
information
encryption
identification.
This
work
provides
feasible
strategy
solve
problem
that
‐doped
cannot
be
can
promote
development
more
long‐wavelength
materials
for
multiple
photonic
applications.
