Advanced Optical Materials,
Год журнала:
2022,
Номер
11(4)
Опубликована: Дек. 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,
Год журнала:
2022,
Номер
14(46), С. 52124 - 52133
Опубликована: Ноя. 9, 2022
High-efficiency
long-wavelength
emission
near-infrared
(NIR)
phosphors
are
the
key
to
next-generation
LED
light
sources.
However,
high-efficiency
usually
exhibit
narrow-band
at
shorter
wavelengths
due
crystal
field
intensity.
In
this
paper,
we
utilize
multi-objective
optimization
discover
NIR
phosphor
Gd3Mg0.5Al1.5Ga2.5Ge0.5O12:0.04Cr3+.
It
exhibits
a
broadband
from
650
1100
nm
peaking
763
nm,
with
full
width
half
maximum
(FWHM)
of
150
an
internal
quantum
efficiency
(IQE)/external
(EQE)
90%/53.1%,
and
good
thermal
stability
(85.3%
@
°C).
The
packaging
results
show
that
∼53.2
mW
output
power
is
achieved
915
input
power,
which
suggests
promising
applications
for
pc-LED.
Our
approach
based
on
data
wavelength
(WL)
IQE
garnet:Cr
construct
machine
learning
models.
An
active
strategy
used
make
tradeoffs
between
WL
IQE,
able
find
targeted
after
only
four
iterations
synthesis
characterization.
Advanced Optical Materials,
Год журнала:
2022,
Номер
11(3)
Опубликована: Дек. 3, 2022
Abstract
Near‐infrared
(NIR)
spectroscopy
based
on
phosphor‐converted
light‐emitting‐diode
(pc‐LED)
has
promising
applications
in
food
quality
analysis,
security
monitoring,
medical
diagnosis,
and
bioimaging
fields,
stimulating
the
demand
of
developing
NIR
phosphors
with
high‐performance.
Herein,
a
highly
efficient
thermally
robust
Ca
3
MgHfGe
O
12
:Cr
3+
phosphor
is
discovered,
which
exhibits
broadband
emission
(λ
em
=
800
nm)
covering
700
to
1100
nm
region
an
internal
quantum
efficiency
as
high
90.7%
when
excited
by
460
blue
light.
Moreover,
intensity
at
423
K
retains
84.5%
that
room
temperature.
The
luminescence
this
material
mainly
ascribed
ultrawide
bandgap
host,
extremely
weak
electron–photon
coupling
effect,
defect‐free,
structural
rigidity.
pc‐LED
device
fabricated
using
optimized
Mg
0.97
Hf
Ge
:0.06Cr
combined
455
LED
chip
produces
excellent
output
power
49.5
mW
@
11.5%
under
driving
current
150
mA,
indicates
superiority
well‐known
ScBO
same
condition.
Therefore,
work
not
only
provides
material,
but
also
highlights
design
rules
for
searching
high‐performance
materials
toward
applications.
Advanced Optical Materials,
Год журнала:
2022,
Номер
11(4)
Опубликована: Дек. 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.
