Advanced Optical Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Dec. 16, 2024
Abstract
Cr
3+
‐doped
near‐infrared
(NIR)
phosphors
have
attracted
significant
attention
in
recent
years.
Despite
this,
achieving
high‐performance
NIR
with
broadband
emission
and
excellent
thermal
stability
remains
a
considerable
challenge.
This
study
presents
Lu
3
Ga
5
O
12
:Cr
,
which
demonstrates
tunable
peak
ranging
from
705
to
759
nm
an
increased
full‐width
at
half‐peak
maximum
(FWHM)
46
139
by
substituting
the
[Mg
2+
‐Ge
4+
]
chemical
unit
for
[Ga
‐Ga
unit.
Additionally,
MgGa
GeO
Yb
energy
transfer
channel
(Cr
‐Yb
)
is
constructed.
Under
blue
light
excitation,
characteristic
peaks
of
(600–900
nm)
(900–1100
are
observed
simultaneously.
However,
band
between
850
900
relatively
weak,
resulting
discontinuous
spectrum.
To
address
Nd
proposed,
exhibit
continuous
FWHM
253
internal
quantum
efficiency
47.3%.
The
luminescence
intensity
retains
81%
its
room
temperature
value
even
423
K.
Combining
this
new
phosphor
LED
chip
results
portable
source
potential
applications
non‐destructive
detection,
information
encryption,
bio‐imaging,
remote
control.
work
offers
novel
perspective
developing
phosphors.
Inorganic Chemistry,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Feb. 12, 2025
The
research
on
near-infrared
(NIR)
phosphors
has
become
a
trending
topic,
as
their
optical
properties
directly
impact
the
performance
of
NIR
phosphor-converted
light-emitting
diode
(pc-LED).
pc-LED
emerged
multifunctional
light
source
across
various
fields
due
to
its
unique
advantages
high
penetration
and
invisibility.
Herein,
peculiar
broadband
NIR-emitting
phosphor
is
presented,
RbAl3P6O20:
Cr3+
(RAPO:
Cr3+),
with
an
emission
range
from
650
1000
nm
peaking
at
∼785
full-width
half-maximum
(fwhm)
∼1900
cm–1.
Gaussian
fitting
analysis
reveals
that
originates
Cr3+,
occupying
two
different
octahedral
sites
in
host.
optimized
RAPO:
0.08Cr3+
exhibits
internal
quantum
efficiency
60%
excellent
thermal
stability
(90%
423
K).
application
devices
was
evaluated
by
assembling
InGaN-based
LED
(450
nm),
achieving
remarkable
output
power
27.9
mW
120
mA.
results
demonstrate
optimistic
for
photoelectron
(pc-LED)
sources.
Lanthanide
doping
has
been
instrumental
in
tuning
the
emissions
of
double
perovskite
halides
(DPHs)
into
near-infrared
(NIR)
region.
However,
limited
penetration
depth
UV
excitation
and
typically
low
photoluminescence
quantum
yield
(PLQY)
these
materials
restrict
their
utility
biomedical
applications.
In
this
paper,
Cr3+-doped
lead-free
DPHs
(Cs2NaScCl6:Cr3+)
have
explored,
featuring
a
broadband
NIR
emission
spanning
800–1300
nm
an
impressive
PLQY
76.9%.
Oriented
toward
biological
applications,
we
employ
Yb3+
as
codopant
to
be
introduced
Cs2NaScCl6:Cr3+.
The
novel
Cs2NaScCl6:Cr3+,Yb3+
crystal
powder
displays
red-shifted
(peaking
at
995
nm)
with
remarkably
narrower
full
width
half-maximum
(fwhm)
51
nm.
Importantly,
efficient
energy
transfer
between
Cr3+
enables
maintain
46.1%
upon
780
excitation.
Leveraging
its
NIR-I
excitable
NIR-II
emissive
properties,
presents
great
potential
biodetection
bioimaging
Its
superior
efficiency,
high
PLQY,
favorable
spectral
characteristics
position
material
promising
candidate
for
advanced
techniques
requiring
deep
tissue
imaging
contrast.
Inorganic Chemistry Frontiers,
Journal Year:
2024,
Volume and Issue:
11(20), P. 6898 - 6908
Published: Jan. 1, 2024
The
anti-thermal
quenching
of
Cr
3+
is
determined
by
the
attribution
defect
level,
which
originates
from
coupling
between
doped
ion
and
V
O
.
NIR
pc-LED
achieves
an
output
power
59.67
mW
with
working
current
150
mA.
