Advanced Optical Materials,
Journal Year:
2024,
Volume and Issue:
12(22)
Published: June 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.
Abstract
Near‐infrared
(NIR)
phosphor‐converted
light‐emitting
diodes
(pc‐LEDs)
are
considered
as
promising
next‐generation
light
sources
for
optoelectronic
and
biomedical
applications.
Nevertheless,
NIR
phosphors
with
large
bandwidths,
long
emission
peaks,
high
external
quantum
efficiencies
(EQEs)
valuable
thermal
stabilities
challenging
to
develop.
Herein,
this
study
reports
a
novel
gallium
germanate
host,
Ga
3
Al
Ge
2
O
13
(GAGO),
bandgap
rigid
host
lattice
Cr
3+
ion
doping.
The
blue
LED
excitable
GAGO:0.012Cr
phosphor
can
produce
broadband
maximum
intensity
at
816
nm
full‐width
half‐maximum
(FWHM)
of
187
nm.
Notably,
the
also
exhibits
an
excellent
EQE
35.8%
perfect
stability
(I
423
K
/I
298
=
67.4%).
Moreover,
attractive
afterglow
duration
more
than
24
h
is
achieved
in
GAGO:0.004Cr
phosphor.
type
origin
traps
discussed,
possible
persistent
luminescent
(LPL)
mechanism
proposed.
Finally,
pc‐LED
based
on
fabricated.
results
demonstrate
that
obtained
show
great
potential
use
night
vision,
nondestructive
detection,
bioimaging
information
encryption.
This
provides
new
insight
into
development
materials
efficiency,
good
extraordinary
performance.
Abstract
Eu
3+
‐activated
red‐emitting
inorganic
phosphors
have
been
favored
highly
for
their
classical
5
D
0
→
7
F
J
(J
=
0,
1,
2,
3,
4)
emissions.
However,
the
fatal
drawbacks
of
poor
luminous
efficacy
and
weak
4
transition
persist,
resulting
in
ongoing
challenge
achieving
far‐red
emission.
This
research
reports
series
efficient
LnTeBO
(Ln
La
,
Y
Gd
):Eu
with
anomalously
strong
transition,
from
distorted
square
antiprism
[Ln/EuO
8
].
Both
thermal
stability
can
be
greatly
enhanced
via
simple
composition
variation.
]
antiprism‐triggered
2,4
transitions
are
elucidated
depth,
acquiring
ultra‐high
(IQE
95%,
EQE
40%,
AE
42%)
near‐zero
quenching
(99%@150°C
98%@200°C).
Subsequently,
versatile
utilizations
indoor
lighting,
plant
growth
security
ink
illustrated.
finding
establishes
a
deep
understanding
constructing
high‐quality
‐centered
structural
units
antiprism.
Journal of Materials Chemistry C,
Journal Year:
2024,
Volume and Issue:
12(31), P. 11907 - 11915
Published: Jan. 1, 2024
In
this
work,
we
have
successfully
synthesized
a
long-term
stable
and
highly
efficient
blue-emitting
SMAO:Eu
2+
phosphor
with
double
luminescence
center,
which
does
not
significantly
disrupt
melatonin
production
in
human-centric
WLED
lighting.
Inorganic Chemistry,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 10, 2025
In
this
work,
Ca3WO6
(CWO)
phosphors
were
successfully
synthesized
using
a
high-temperature
solid-state
method,
exhibiting
an
anomalous
far-red/near-infrared
(FR-NIR)
emission
centered
at
685
nm.
The
origin
of
FR-NIR
is
confirmed
through
Raman
spectroscopy,
X-ray
photoelectron
spectroscopy
(XPS),
density
functional
theory
(DFT)
calculations,
and
heterovalent
cationic
substitution
(Y3+/Na+
→
Ca2+).
These
analyses
indicate
that
interstitial
oxygen
(Oi)
defects
within
the
lattice
are
primarily
responsible
for
emission.
Y3+
Ca2+
increases
concentration
Oi,
significantly
enhancing
intensity.
This
results
in
increase
internal
quantum
efficiency
(IQE)
increasing
from
12.8
to
90.9%,
realizing
efficient
self-activated
phosphors.
Furthermore,
CWO
demonstrate
unique
dual-band
characterized
by
blue
435
nm
endows
with
multifunctional
applications
plant
growth
lighting,
nondestructive
testing,
night
vision
fields.
Abstract
Cr
3+
‐activated
near‐infrared
(NIR)
emitting
phosphors
are
considered
as
one
of
the
most
potential
light‐conversion
materials
for
NIR
phosphor
converted
light‐emitting
diodes
(NIR
pc‐LEDs).
However,
it
is
still
a
challenge
single
ion
to
achieve
flat
ultra‐broadband
emission
toward
multi‐functional
spectroscopy
applications.
Herein,
chemical
unit
co‐substituting
strategy
utilized
regulate
crystallographic
occupancy
ions,
and
successfully
realized
with
record
wavelength
915
nm
in
garnet‐type
Ca
3
Sc
2‐
x
Hf
Al
Si
3‐
O
12
:
y
(0
≤
1,
0.02
0.06),
together
large
full
width
at
half
maximum
(FWHM)
regulation
from
130
250
nm.
The
relation
between
site
occupation
ions
disordered
[CaO
8
],
[(Sc,
Hf)O
6
]
[(Si,
Al)O
4
polyhedrons
corresponding
clarified
by
carefully
evaluating
structural
evolution,
Raman
spectra,
electron
paramagnetic
resonance
time‐resolved
lifetime
spectra
ions.
crystal
field
strength
investigated
further
clarify
multi‐sites
induced
broadband
emission.
Finally,
blue
light
pumped
pc‐LED
fabricated
total
output
power
37.58
mW
photoelectric
conversion
efficiency
(PCE)
13.67%@100
mA,
which
realizes
applications
night
vision
imaging,
non‐destructive
detection
palmprint
vein
recognition
assistant
medical
treatment.
