Advanced Optical Materials,
Год журнала:
2024,
Номер
12(22)
Опубликована: Июнь 25, 2024
Abstract
Broadband
near‐infrared
(NIR)
emitting
materials
have
gained
considerable
attention
for
their
applications
in
lighting,
displays,
sensing,
bio‐imaging,
and
optical
amplification.
Recently,
numerous
excellent
broadband
NIR
are
developed
by
introducing
Cr
3+
,
Bi
+
or
Ni
2+
ions
to
various
hosts.
However,
there
is
a
notable
absence
of
reports
on
ultra‐broadband
emitters
spanning
the
entire
telecommunication
window
as
well
NIR‐I
(700–1000
nm)
NIR‐II
(1000–1700
biological
windows
activated
vanadium
ions.
Herein,
study
presents,
first
time
best
knowledge,
emission
ranging
from
850
1600
nm
(peaking
at
≈1000
room
temperature
vanadium‐doped
phosphate
glass.
Detailed
spectra
microscopic
structure
analysis
reveal
that
two
V
‐emitting
centers
predominantly
contribute
emission,
corresponding
3
T
2
(
F)→
A
F)
spin‐allowed
1
E(
D)
spin‐forbidden
electron
transitions
tetrahedrally
coordinated
Notably,
tunability
peak
demonstrated
adjusting
local
glass
doping
content.
Moreover,
glass‐converted
light‐emitting
diodes
(gc‐LEDs)
fabricated
glass,
potential
demonstrated.
The
work
opens
new
avenues
design
fabrication
NIR‐emitting
opto‐electronic
devices.
Inorganic Chemistry,
Год журнала:
2024,
Номер
63(14), С. 6555 - 6563
Опубликована: Март 26, 2024
Near-infrared
(NIR)
phosphor
conversion
light-emitting
diodes
(pc-LEDs)
have
great
application
potential
as
NIR
light
sources
in
many
fields
such
food
analysis,
night
vision
illumination,
and
bioimaging
for
noninvasive
medical
diagnosis.
In
general,
phosphors
synthesized
by
a
high-temperature
solid-phase
method
large
particle
sizes
to
be
processed
fine
powders
grinding
process,
which
may
introduce
surface
defects
lower
the
luminous
efficiency.
Here,
we
report
sol–gel
sintering
with
ammonium
nitrate
citric
acid
sacrificing
agents
synthesize
high
purity,
nanosized
(less
than
50
nm)
Zr4+/Ni2+
codoped
MgAl2O4
spinel
phosphors,
is
matrix,
Ni2+
center,
Zr4+
acts
charge
compensator.
We
systematically
characterized
crystal
structures
luminescence
properties
of
Ni2+-doped
MgAl2O4.
Under
390
nm
excitation,
emission
spectrum
covers
900–1600
nm,
half-peak
width
251
peak
position
located
at
1230
nm.
demonstrated
that
incorporating
small
amounts
compensator,
intensity
was
doubled
over
phosphor.
The
optimal
content
compensator
2
mol
%.
More
importantly,
inclusion
led
improved
thermal
stability
properties,
measured
100
°C
33.83%
room
temperature
(20
°C).
This
study
demonstrates
nanomaterials
high-purity
enhanced
optical
can
designed
through
compensation
strategy
method.
Dalton Transactions,
Год журнала:
2024,
Номер
53(9), С. 4214 - 4221
Опубликована: Янв. 1, 2024
Cr
3+
and
Ni
2+
codoped
Mg
0.5
Zn
Ga
2
O
4
SWIR
phosphor
exhibits
a
broadband
emission
centered
at
1304
nm
with
FWHM
of
250
nm,
achieving
near-unity
internal
quantum
efficiency
(IQE
=
97.7%)
good
thermal
stability
(70.7%@423
K).
Laser & Photonics Review,
Год журнала:
2024,
Номер
unknown
Опубликована: Июнь 11, 2024
Abstract
Near‐infrared
(NIR)
phosphor‐converted
light‐emitting
diode
(pc‐LED)
light
sources
in
the
second
NIR
window
(NIR‐II,
1000–1700
nm)
have
sparked
great
interest
for
their
emerging
applications
non‐destructive
detection
and
medical
diagnostics
fields.
However,
development
of
efficient
NIR‐II
phosphors
that
can
be
excited
by
commercial
blue
LED
chips
remains
a
significant
challenge,
thus
impeding
pc‐LED.
Herein,
blue‐light‐excitable
broadband
luminescence
Ni
2+
is
achieved
upon
incorporating
Cr
3+
into
Ca
3
Ga
2
Ge
O
12
(CGGO)
host
simultaneously.
Through
energy
transfer
from
to
,
CGGO:Cr
,Ni
phosphor
presents
improved
emission
peaking
at
1470
nm
under
460
excitation.
The
internal/external
quantum
efficiency
values
are
significantly
13.8%/3.3%
24.6%/13.3%
along
with
enhanced
thermal
stability.
Finally,
pc‐LED
fabricated
combining
450
chip,
its
potential
examination
biomedical
imaging
fields
been
demonstrated.
strategy
co‐doping
solves
problem
cannot
effectively
provides
design
insights
exploit
more
ultra‐broadband
pc‐LEDs
based
on
chips.
ACS Materials Letters,
Год журнала:
2024,
Номер
6(10), С. 4555 - 4563
Опубликована: Сен. 3, 2024
Presently,
there
are
very
limited
options
for
a
broad-band
long-wavelength
near-infrared
phosphor-converted
light-emitting
diode
(LWNIR
pc-LED)
with
wavelengths
above
∼1500
nm,
and
most
LWNIR
phosphors
have
low
luminescence
quantum
efficiency.
Here,
Ni2+-doped
MgIn2O4
antispinel
were
prepared
by
high-temperature
solid-state
reaction
method.
Under
365
nm
excitation,
they
exhibited
emission
in
the
range
of
1200–2100
an
peak
∼1490
full
width
at
half-maximum
∼313
indicating
weak
crystal
field
environment
high
electron
polarization
around
center
[MgO6]
octahedron.
The
IQE
EQE
MgIn2O4:Ni2+
∼47.93%
∼34.66%,
respectively.
optimized
phosphor
was
encapsulated
LED
chip
to
obtain
pc-LED
device
night
vision
lighting,
nonvisual
detection,
biological
imaging.
Our
results
confirmed
that
lighting
based
imaging
technology
showed
clear
safety
advantages
over
traditional
high-energy
ray
Inorganic Chemistry Frontiers,
Год журнала:
2024,
Номер
unknown
Опубликована: Янв. 1, 2024
We
developed
a
Cr
3+
-doped
Cs
2
NaLuCl
6
by
grinding–sintering
method,
which
exhibited
emission
peaked
at
around
960
nm,
with
FWHM
of
∼182
and
the
IQE
EQE
optimized
phosphor
were
as
high
∼92.9%
∼60.75%,
respectively.
