Advanced Materials,
Journal Year:
2024,
Volume and Issue:
36(30)
Published: May 11, 2024
Abstract
The
spotlight
has
shifted
to
near‐infrared
(NIR)
luminescent
materials
emitting
beyond
1000
nm,
with
growing
interest
due
their
unique
characteristics.
ability
of
NIR‐II
emission
(1000–1700
nm)
penetrate
deeply
and
transmit
independently
positions
these
NIR
for
applications
in
optical‐communication
devices,
bioimaging,
photodetectors.
combination
rare
earth
metals/transition
metals
a
variety
matrix
provides
new
platform
creating
chemical
physical
properties
science
device
applications.
In
this
review,
the
recent
advancements
activated
by
transition
metal
ions
are
summarized
role
spanning
sensing,
optoelectronics
is
illustrated.
It
started
various
synthesis
techniques
explored
how
earths/transition
can
be
skillfully
incorporated
into
matrixes,
thereby
endowing
them
discussion
strategies
enhancing
excitation
absorption
efficiency,
spotlighting
innovations
like
dye
sensitization
surface
plasmon
resonance
effects
then
extended.
Subsequently,
significant
focus
placed
on
functionalization
Finally,
comprehensive
analysis
challenges
proposed
earth/transition
ion‐doped
materials,
summarizing
insights
each
section
provided.
Abstract
Broadband
near-infrared
(NIR)-emitting
phosphors
are
key
for
next-generation
smart
NIR
light
sources
based
on
blue
LEDs.
To
achieve
excellent
phosphors,
we
propose
a
strategy
of
enhancing
the
crystallinity,
modifying
micromorphology,
and
maintaining
valence
state
Cr
3+
in
Ca
3
Sc
2
Si
O
12
garnet
(CSSG).
By
adding
fluxes
sintering
reducing
atmosphere,
internal
quantum
efficiency
(IQE)
is
greatly
enhanced
to
92.3%.
The
optimized
CSSG:6%Cr
exhibits
thermal
stability.
At
150
°C,
97.4%
emission
at
room
temperature
can
be
maintained.
fabricated
NIR-LED
device
emits
high
optical
power
109.9
mW
520
mA.
performances
both
achieved
phosphor
almost
best
results
until
now.
mechanism
optimization
investigated.
An
application
source
demonstrated.
Abstract
Cr
3+
/Cr
4+
‐activated
near‐infrared
(NIR)
luminescent
materials
have
attracted
extensive
attention
owing
to
their
tunable
emission
wavelength
and
widespread
applications
in
plant
growth,
food
analysis,
biomedical
imaging,
night
vision,
so
on.
Plenty
of
excellent
NIR
are
developed
by
introducing
ion
various
inorganic
hosts.
Herein,
the
effect
crystal
field
on
luminescence
combining
Tanabe–Sugano
energy
level
diagram
configuration
coordinate
model
is
discussed.
Research
progress
‐doped
materials,
including
phosphors
designed
from
structural
models
with
octahedral,
tetrahedral,
other
coordination
types,
then
outlined.
The
properties
more
than
200
kinds
summarized.
In
particular,
several
strategies
for
tuning
wavelength,
broadening
band,
enhancing
efficiency,
improving
thermal
stability,
listed.
Finally,
current
challenges
future
prospects
research
presented.
This
review
will
contribute
a
deeper
understanding
not
only
mechanism
but
also
chromium‐doped
as
develop
better
performance
explore
applications.
ACS Applied Materials & Interfaces,
Journal Year:
2021,
Volume and Issue:
13(15), P. 18274 - 18282
Published: April 8, 2021
Recently,
trivalent
chromium
ion
doped
phosphors
have
exhibited
significant
application
potential
in
broadband
near-infrared
(NIR)
phosphor-converted
light-emitting
diodes
(pc-LEDs).
However,
developing
an
NIR
phosphor
with
both
broad
emission
bandwidth
and
excellent
luminescence
thermal
stability
is
still
a
great
challenge.
Here,
we
demonstrate
phosphor,
ScF3:Cr3+,
which
can
fulfill
conditions
simultaneously.
The
prepared
show
the
range
of
700
to
1100
nm,
full
width
at
half-maximum
(FWHM)
140
nm
peaking
853
nm.
These
also
(the
intensity
ScF3:Cr3+
keeps
85.5%
150
°C
compared
value
room
temperature).
An
pc-LED
based
on
blue
LED
chips
was
fabricated
tested.
results
that
yield
strong
emission.
This
work
not
only
provides
promising
for
pc-LEDs
but
has
important
guiding
significance
effect
synthesis
properties
Cr3+-doped
fluorides.
Advanced Functional Materials,
Journal Year:
2021,
Volume and Issue:
32(1)
Published: Sept. 29, 2021
Abstract
Near‐infrared
(NIR)
light‐emitting
diodes
(LEDs)
light
sources
are
desirable
in
photonic,
optoelectronic,
and
biological
applications.
However,
developing
broadband
red
NIR‐emitting
phosphors
with
good
thermal
stability
is
always
a
challenge.
Herein,
the
synthesis
of
Eu
2+
‐activated
SrY
2
O
4
phosphor
high
photoluminescence
quantum
efficiency
broad
emission
band
ranging
from
540
to
770
nm
peaking
at
620
under
450
excitation
designed.
Sr/Ba
substitution
:Eu
has
been
further
utilized
achieve
tunable
by
modifying
local
environment,
which
facilitates
giant
red‐shifted
773
while
maintaining
outstanding
.
The
NIR
attributed
enhanced
Stokes
shift
crystal
field
strength
originated
structural
distortions
[Y1/Eu1O
6
]
[Y2/Eu2O
].
investigation
charge
distribution
around
Y/Eu
provides
additional
insight
into
increasing
covalency
tune
toward
region.
As‐fabricated
phosphor‐converted
LEDs
demonstration
shows
its
potential
night‐vision
technologies.
This
study
reveals
luminescence
mechanism
oxide‐based
hosts
design
principle
for
exploiting
‐doped
stability.
Abstract
Broadband
near‐infrared
(NIR)
phosphor‐converted
(pc)
LED
is
promising
next‐generation
tiny
light
source
for
smart
and
broadband
NIR
spectroscopy
technology.
However,
phosphors
suffer
from
challenges
in
terms
of
low
quantum
efficiency
bandwidth.
By
selecting
a
host
that
has
big
bandgap
weakening
coupling
effect
among
Cr
3+
,
novel
LiGaP
2
O
7
:Cr
(LGAP:Cr
)
phosphor
high
external
(28.3%)
discovered.
Under
≈450
nm
excitation,
LGAP:Cr
shows
broad
emission
700
to
1100
with
bandwidth
≈170
nm.
Importantly,
the
fabricated
pcLED
demonstrates
bright
an
excellent
performance
night
vision.
The
results
promise
use
high‐performance
employs
only
one
blue
chip.
Chemistry of Materials,
Journal Year:
2022,
Volume and Issue:
34(3), P. 1376 - 1384
Published: Jan. 19, 2022
Broadband
near-infrared
(NIR)
light
sources
based
on
phosphor-converted
light-emitting
diodes
(pc-LEDs)
are
desirable
for
biochemical
analysis
and
medical
diagnosis
applications;
however,
the
development
of
target
NIR
phosphor
is
still
a
challenge.
Herein,
broadband
phosphors,
Cr3+-activated
CaSc1–xAl1+xSiO6
(λem
=
950
nm),
designed
optimized
by
chemical
substitution
toward
enhanced
quantum
efficiency
thermal
stability.
Structural
spectral
analyses
along
with
density
functional
theory
calculations
reveal
that
Sc3+/Al3+
contributes
to
enhancing
structural
rigidity
local
symmetry
[Sc/AlO6]
octahedron
so
nonradiative
relaxation
Cr3+
emission
centers
suppressed
significantly.
The
as-fabricated
phosphor-in-glass-based
LED
source
demonstrates
great
potential
in
detection
alcohol
concentration.
This
study
provides
structure
design
principle
exploring
phosphors
stability
will
also
stimulate
further
studies
material
discovery
quantitative
spectroscopy.
