Arabian Journal of Chemistry,
Journal Year:
2024,
Volume and Issue:
17(9), P. 105921 - 105921
Published: July 21, 2024
The
recent
years
have
witnessed
a
great
leap
for
near-infrared
(NIR)
spectroscopy
technology
in
multifunctional
application
fields.
In
this
study,
double-perovskite
structured
Cr3+-doped
Cs2KScF6
fluoride
NIR
phosphor
with
peak
location
at
778
nm
and
full-width
half
maximum
(FWHM)
of
95
was
synthesized
by
co-precipitation
method.
integral
emission
intensity
423
K
retains
70
%
that
room
temperature
(RT),
showing
good
luminescent
thermal
stability.
Combining
the
obtained
an
converted
light-emitting
diode
(NIR
pc-LED)
device,
output
power
photoelectric
conversion
efficiency
can
reach
72.28
mW
6.83
320
mA.
By
virtue
optical
performance,
clear
structural
images
different
fruits
were
visualized
using
pc-LED
as
light
source,
suggesting
potential
Cs2KScF6:Cr3+
to
be
used
high-power
LED
devices.
ACS Applied Materials & Interfaces,
Journal Year:
2024,
Volume and Issue:
16(42), P. 57365 - 57376
Published: Oct. 12, 2024
Efficient
blue-light-excitable
broadband
cyan-emitting
phosphors
may
yield
full-visible-spectrum
white
light-emitting
diodes
(WLEDs)
with
ultrahigh
color
rendering
(Ra
>
95).
However,
this
requires
closing
the
"cyan
gap"
in
480–520
nm
region
of
visible
spectrum,
which
is
challenging.
Herein,
a
well-performed
garnet
phosphor
Ca2LuAlGa2Si2O12:Ce3+
(CLAGSO:Ce3+)
reported.
Under
430
excitation,
optimal
CLAGSO:5%Ce3+
compound
exhibits
cyan
emission
(peak,
496
nm;
bandwidth,
102
nm)
high
internal
quantum
efficiency
85.6%
and
an
excellent
thermal
resistance
performance
(69.1%
at
423
K).
Importantly,
as-prepared
provides
sufficient
enables
filling
well-known
so-called
between
blue
LED
chip
commercial
Y3Al5O12:Ce3+
(YAG:Ce3+)
yellow
phosphor.
Impressively,
WLED
device
fabricated
sample
shows
low
correlated
temperature
(4053
K)
index
=
96.6),
as
well
luminous
efficacy
(74.09
lm
W–1).
These
results
highlight
importance
blue-excited
gap
enabling
human-centric
warm
devices
for
high-quality
solid-state
lighting.
Abstract
Near‐infrared
phosphor‐converted
light‐emitting
diodes
(NIR
pc‐LEDs)
are
regarded
one
of
the
most
promising
light
sources
for
food
analysis,
plant
growth,
bioimaging,
night
vision,
and
so
on.
Cr
3+
‐activated
NIR
phosphors
have
garnered
increasing
attention
due
to
their
exceptional
photoluminescence
properties
pc‐LED.
However,
them
suffer
from
poor
thermal
stability
or
low
efficiency
which
limits
large‐scale
application.
Herein,
a
novel
Sr
3
MgGe
5
O
14
:
(SMGO:
)
phosphor
is
presented,
exhibits
broadband
emission
ranging
range
650–1000
nm
with
peak
at
735
nm.
SMGO:
0.005Cr
demonstrates
an
almost
near‐unity
internal
quantum
(99.4%)
excellent
quenching
performance
(
I
423
K
/I
298
=
86%).
First‐principles
theory
calculation
indicates
that
ions
preferentially
occupy
[Ge2/MgO
4
]
[Ge3O
sites
high
doping
concentration
within
SMGO
host,
illustrating
mechanism.
Furthermore,
pc‐LED
manufactured
by
utilizing
445
blue
LED
chip,
output
power
140.5
mW
photoelectric
conversion
15.5%
300
mA.
Potential
applications
growth
detection
several
mental
also
demonstrated,
demostrates
its
application
in
growth.
ACS Applied Materials & Interfaces,
Journal Year:
2024,
Volume and Issue:
16(42), P. 57316 - 57324
Published: Oct. 11, 2024
Here,
near-infrared
broad
dual-band
emission
phosphors
were
achieved
through
energy
transfer
between
Cr3+
and
Ni2+
ions
in
the
β-Ga2O3
host.
All
samples
co-doped
with
exhibit
covering
600–1700
nm
under
430
excitation.
Thanks
to
doping
of
ions,
intensity
Ga2O3:Cr3+,
has
increased
by
about
2.4
times
internal
quantum
efficiency
83.2%
compared
Ga2O3:Ni2+
phosphors.
Meanwhile,
when
fluorescence
lifetime
was
monitored
at
745
nm,
an
efficient
host
verified.
Due
significant
differences
temperature-sensitive
properties
a
thermometer
designed
utilizing
ratio
technology,
achieving
maximum
relative
sensitivity
5.26%
K–1,
which
surpasses
most
optical
temperature
measurement
This
suggests
that
hold
promise
as
potential
candidates
for
materials.
Additionally,
broadband
sample
been
investigated
applications
component
analysis
night
vision,
demonstrating
its
versatility
multifunctional
applications.
Abstract
Broadband
near‐infrared
(NIR)
phosphors
are
crucial
components
of
next‐generation
NIR
lighting
sources.
However,
the
design
high‐efficiency
and
thermally
stable
still
poses
a
significant
challenge,
whose
quantum
efficiencies
(QEs)
directly
limited
by
their
absorption
efficiency
(AE)
toward
incident
light.
Here,
an
efficient
emission
with
AE
up
to
64.9%
keeping
91.23%
at
423
K
is
demonstrated
via
Cr
3+
heavy
solid
solution
in
rigid
framework
LiCaGaF
6
:Cr
(LCGFC).
Isomorphic
LiCaAlF
also
exhibits
thermal
robustness,
while
traps
low
doping
concentration
QEs.
Comparative
studies
on
crystal
structure,
formation
energy,
Helmholtz
free
energy
disclose
that
substitution
equivalent
equiradius
Ga
site
versus
radii
differential
Al
generates
heavier
sustainable
structural
rigidity
acquirement
higher
better
stability.
Incorporating
LCGFC
blue
InGaN
chip,
phosphor‐converted
light‐emitting
diode
fabricated
realize
wireless
optical
communication
good
penetrability
through
biological
tissue
some
organic
products.
These
findings
develop
strategy
based
activator
solutions
achieve
but
advance
novel
optoelectronic
applications.
