Acta Physica Sinica,
Год журнала:
2024,
Номер
73(15), С. 157803 - 157803
Опубликована: Янв. 1, 2024
Phosphors-converted
near-infrared
LED
(pc-NIR
LED)
possesses
applications
in
various
fields
including
food
quality
analysis,
night
vision,
biomedical
imaging,
and
biomedicine.
The
design
development
of
broadband
(NIR)
phosphors
with
the
required
properties
are
decisive
significance
for
pc-NIR
devices.
Cr<sup>3+</sup>
doped
considered
to
be
most
promising
materials
commercialization.
Broadband
NIR
luminescent
have
attracted
more
attention
due
their
potential
light
sources.
However,
emission
wavelength
phosphor
is
generally
located
I
region
less
than
850
nm,
realizing
II
still
a
challenge.
In
this
work,
series
Na<sub>3</sub>YSi<sub>3</sub>O<sub>9</sub>
new
silicate
prepared
by
solid-state
method
N<sub>2</sub>
atmosphere
at
1150
℃
8
h.
We
take
advantages
nature
multi
octahedral
sites
suitable
studied
redshift
broaden
spectrum.
phase,
crystal
structure,
microstructure,
photoluminescence,
main
peak
decay
thermal
stability
samples
systematically
studied.
results
show
that
pure
phases,
uneven
morphology,
slight
agglomeration,
sizes
micrometer
range.
weak
field
environment
lattice,
<i>Dq</i>/<i>B</i>
value
2.29.
Under
excitation
blue
485
strongest
peaks
Na<sub>3</sub>Y<sub>1–<i>x</i></sub>
Si<sub>3</sub>O<sub>9</sub>:<i>x</i>
984
nm
(NIR
region),
which
longer
those
activated
phosphors.
Due
multi-site
occupation
full
width
half
maximum
(FWHM)
spectrum
as
high
183
nm.
optimal
doping
concentration
3%,
quenching
mechanism
dipole-dipole
interaction
between
ions.
Fluorescence
curves
luminescence
lifetime
Na<sub>3</sub>Y<sub>0.97</sub>Si<sub>3</sub>O<sub>9</sub>:0.03Cr<sup>3+</sup>
sample
gradually
decreases
increase
temperature.
temperature-dependent
spectra
intensity
temperature
range
from
298
K
423
K,
activation
energy
Δ<i>E</i>
0.157
eV.
Dalton Transactions,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 1, 2025
This
review
covers
NIR
luminescent
materials
doped
with
RE,
TM,
and
main-group
ions,
focusing
on
their
optical
properties,
mechanisms,
applications
in
bioimaging,
LEDs,
sensors,
strategies
to
improve
efficiency
thermal
stability.
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.
Dalton Transactions,
Год журнала:
2023,
Номер
52(19), С. 6569 - 6577
Опубликована: Янв. 1, 2023
The
Cr3+-doped
near-infrared
(NIR)
phosphors
have
been
extensively
investigated
owing
to
their
promising
applications
in
biomedicine,
food
safety
detection,
and
night
vision
surveillance.
However,
achieving
broadband
(FWHM
>
160
nm)
NIR
emission
is
still
challenging.
In
this
paper,
novel
Y2Mg2Ga2-xSi2O12:xCr3+
(YMGS:xCr3+,
x
=
0.005-0.08)
were
prepared
by
a
high-temperature
solid-state
reaction.
crystal
structure,
photoluminescence
properties
of
the
phosphor,
device
performance
pc-LED
researched
detail.
When
excited
at
440
nm,
YMGS:0.04Cr3+
phosphor
exhibited
range
650-1000
peaking
790
nm
with
full
width
half-maximum
(FWHM)
up
180
nm.
wide
FWHM
YMGS:Cr3+
conducive
its
extensive
application
spectroscopic
technology.
addition,
could
maintain
70%
initial
intensity
373
K.
By
combining
commercial
blue
chip
resulting
demonstrated
output
power
14
mW
photoelectric
conversion
efficiency
5%
drive
current
100
mA.
This
work
provides
option
for
devices.
