Advanced Optical Materials,
Journal Year:
2022,
Volume and Issue:
11(4)
Published: Dec. 16, 2022
Abstract
Near‐infrared
(NIR)
phosphor‐converted
light‐emitting
diodes
(pc‐LEDs)
are
an
emerging
light
source
demanded
for
the
miniaturization
of
NIR
spectroscopy.
However,
photoelectric
efficiency
and
spectral
properties
pc‐LEDs
still
very
limited
due
to
a
lack
efficient
broadband
phosphors
with
peak
emission
wavelength
>850
nm.
Here,
novel
Cr
3+
‐activated
perovskite‐like
Mg
4
Ta
2
O
9
phosphor
is
reported,
which
exhibits
broad
band
peaking
at
850
nm
high
internal
(external)
quantum
72%
(33.4%).
The
fabricated
pc‐LED
shows
covering
whole
700–1100
spectrum
range
conversion
22.1%
10
mA.
This
work
may
provide
new
paradigm
discovery
singly
doped
excellent
performance.
ACS Applied Materials & Interfaces,
Journal Year:
2022,
Volume and Issue:
14(45), P. 51157 - 51164
Published: Nov. 7, 2022
Broadband
near-infrared
(NIR)
phosphors
are
in
high
demand
for
creating
"smart"
NIR
phosphor-converted
light-emitting
diode
(pc-LED)
sources.
In
this
work,
a
series
of
Cr3+-substituted
NIR-emitting
materials
with
highly
efficient,
broad,
tunable
emission
spectra
achieved
by
modifying
the
simple
oxide
Ga2O3
using
[Mg2+-Ge4+]
and
[Ga3+-Ga3+]
co-unit
substitution.
The
results
show
that
peak
can
be
shifted
from
726
to
830
nm
while
maintaining
constant
excitation
blue
light
region,
enabling
extensive
application.
optical
properties
stem
changes
Cr3+
crystal
field
environment
upon
Intriguingly,
temperature-dependent
photoluminescence
position
shows
virtually
no
change
co-substituted
materials.
This
abnormal
phenomenon
is
found
comprehensive
embodiment
weakening
(red-shift)
as
temperature
increases
reduced
local
structure
distortion
(blue-shift)
increasing
temperature.
quantum
yield,
emission,
net-zero
shift
function
make
phosphor
class
optimal
device
incorporation.
As
result,
their
performance
was
studied
coating
on
450
emitting
LED
chip.
fabricated
demonstrates
an
excellent
output
power
photoelectric
conversion
efficiency.
study
provides
tunable,
broadband
spectroscopy
applications
contributes
basic
foundation
Cr3+-activated
phosphors.
Abstract
Broadband
near‐infrared
(NIR)
phosphor
converted
light
emitting
diodes
(pc‐LEDs)
are
novel
compact
sources
that
enable
portable
devices
for
substance
detection.
However,
to
achieve
such
efficient
pc‐LEDs
is
still
a
challenge
due
lack
of
phosphors.
In
this
paper,
Stokes
shift
as
an
efficiency
predictor
emphasized.
Cr
3+
activated
Ca
2
LuZr
Al
3
O
12
(CLZA)
garnet
phosphor,
decreases
from
2990
2854
cm
−1
upon
substituting
Ca‐Zr
with
Lu‐Al.
As
result,
electron–phonon
coupling
related
nonradiative
process
reduced.
The
external
quantum
significantly
enhanced
47.4%,
and
the
fabricated
NIR
pc‐LED
offers
33.7%
@10
mA
electro‐optical
efficiency.
results
can
advance
development
Inorganic Chemistry,
Journal Year:
2023,
Volume and Issue:
62(27), P. 10772 - 10779
Published: June 27, 2023
Near-infrared
phosphor-converted
light-emitting
diodes
(NIR
pc-LEDs),
as
a
new
generation
of
NIR
lighting
sources,
have
wide
prospects
in
the
areas
food
analysis
and
biological
night
vision
imaging.
Nevertheless,
phosphors
are
still
limited
by
short-wave
narrowband
emissions
well
low
efficiency.
Herein,
series
phosphors,
LuCa2ScZrGa2GeO12:Cr3+
(LCSZGG:Cr3+),
with
broadband
been
developed
first
reported.
At
456
nm
excitation,
optimized
LCSZGG:0.005Cr3+
phosphor
represents
an
ultra-broadband
emission
within
range
650–1100
nm,
peaking
near
815
full
width
at
half
maximum
166
nm.
Furthermore,
possesses
good
internal
quantum
efficiency
68.75%,
its
integrated
intensity
423
K
retains
about
64.17%
that
room
temperature.
By
combining
sample
blue
chip,
pc-LED
device
is
fabricated,
which
has
excellent
output
power
37.88
mW
photoelectric
conversion
12.44%
under
100
mA
driving
current.
The
aforementioned
results
demonstrate
these
LCSZGG:Cr3+
expected
light
sources.
Advanced Optical Materials,
Journal Year:
2024,
Volume and Issue:
12(16)
Published: Jan. 15, 2024
Abstract
Broadband
near‐infrared
(NIR)
emissions
in
the
long
wavelength
region
with
simultaneous
high
efficiency
and
thermal
stability
are
desirable
for
NIR
phosphor‐converted
light‐emitting
diodes
(NIR
pc‐LEDs)
light
sources.
Herein,
a
novel
broadband
NIR‐emitting
phosphor
is
reported,
Ba
5
La
3
MgAl
O
15
:Cr
3+
(BLMAO:Cr
),
which
exhibits
emission
band
spanning
700–1300
nm
maximum
peak
(
λ
max
)
at
925
full
width
half
of
160
nm.
The
optimized
achieves
an
internal
quantum
66%,
integrated
intensity
423
K
remains
61%
that
room
temperature,
surpasses
most
Cr
‐activated
phosphors
emitting
long‐wavelength
>
900
nm).
luminescence
properties
elucidated
on
basis
density
functional
calculations
multiple
local
structures
as
generated
by
Ba/La
occupation
disorder
host
material.
applications
pc‐LED
devices
demonstrated,
showing
potential
night‐vision
nondestructive
examination.
results
indicate
BLMAO:Cr
promising
highly
efficient
thermally
stable
LED
Inorganic Chemistry Frontiers,
Journal Year:
2024,
Volume and Issue:
11(9), P. 2718 - 2725
Published: Jan. 1, 2024
A
comparative
investigation
of
broadband
near-infrared
luminescence
from
two
different
occupation
sites
in
Rb
2
LiAlF
6
:Cr
3+
with
high
efficiency
and
excellent
thermal
stability.
Advanced Optical Materials,
Journal Year:
2024,
Volume and Issue:
12(17)
Published: Feb. 25, 2024
Abstract
Far‐red
(FR)
region
(beyond
700
nm)
lighting
sources
possess
special
potential
for
plant
lighting.
However,
it
remains
a
challenge
to
obtain
high‐performance
Cr
3+
‐doped
FR
phosphors.
This
study
developed
phosphor,
Ca
1.8
Mg
1.2
Al
2
Ge
3
O
12
:Cr
(CMAGG:
),
using
the
cation
substitution
strategy.
Under
438
nm
blue
light
excitation,
phosphors
display
emission
centered
at
720
with
full
width
half
maximum
(FWHM)
of
91
nm.
Benefit
from
favorable
match
phytochrome
(P
fr
phosphor
is
combined
InGaN
chips
create
phosphor‐converted
light‐emitting
diode
(pc‐LED),
which
used
in
Italian
lettuce
growth
experiments
and
results
shown
15%
increase
fresh
weight
6.5%
dry
weight.
Notably,
supplemental
modulated
its
morphology.
The
this
will
be
useful
further
research
on
novel
meet
precise
spectral
requirements
growth.
Advanced Optical Materials,
Journal Year:
2024,
Volume and Issue:
12(16)
Published: March 1, 2024
Abstract
Near‐infrared
(NIR)
phosphors
converted
light‐emitting
diodes
(NIR
pc‐LEDs)
are
ideal
NIR
sources
for
versatile
applications,
which
imply
the
practical
significance
in
tailoring
emission
of
to
enhance
performance
specific
application.
Herein,
a
paradigm
emissions
series
Cr
3+
‐doped
match
applications
lighting,
detection,
and
short‐wave
infrared
through
combinatorial
management
crystal‐field
energy
transfer
is
presented.
The
band
largely
increases
from
84
190
nm
when
introduction
[MgO6]‐[GeO4]
into
Y
3
Ga
5
O
12
:0.08Cr
forms
Mg
x
5‐2
Ge
substitution
[GaO6]‐[GaO4].
Such
large
increase
width
makes
it
suitable
near‐infrared
lighting
detection.
Moreover,
Yb
,
Nd
Er
doped
construct
with
broadening
region
enhanced
thermal
stability.
An
optimized
dominates
:0.4Cr
,Yb
phosphor
has
excellent
stability
(129%@423
K)
high‐power
sources.
presented
work
not
only
provides
well‐performed
phosphors,
but
lights
up
avenue
designing
