Chemistry of Materials,
Journal Year:
2022,
Volume and Issue:
34(18), P. 8418 - 8426
Published: Sept. 15, 2022
Broadband
near-infrared
(NIR)
light
source
based
on
phosphor-converted
light-emitting-diode
(pc-LED)
is
crucial
for
applications
in
medical
diagnosis,
food
quality
analysis,
and
night
vision
fields,
motivating
the
development
of
highly
efficient
thermal
robust
NIR
phosphor
materials.
Herein,
a
novel
Cr3+-doped
garnet
Y3In2Ga3O12:Cr3+
emerges
from
fundamental
study
Ln3In2Ga3O12
(Ln
=
La,
Gd,
Y,
Lu)
family.
Upon
450
nm
excitation,
this
material
presents
broadband
emission
covering
650–1100
with
peak
located
at
760
full
width
half
maximum
125
nm.
This
also
possesses
an
ultrahigh
internal
quantum
efficiency
(IQE
91.6%)
absorption
(AE
46.6%),
resulting
external
as
high
42.7%.
Moreover,
intensity
150
°C
maintains
100%
initial
intensity,
showing
rare
zero-thermal-quenching
property.
Fabricating
pc-LED
device
by
using
material,
excellent
output
power
68.4
mW
photoelectric
15.9%
under
mA
driving
current
can
be
obtained,
which
exhibits
much
better
performance
than
devices
fabricated
some
reported
Therefore,
work
not
only
provides
ultraefficient
thermally
spectroscopy
application
but
contributes
to
foundation
design
rules
materials
performance.
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.
Advanced Functional Materials,
Journal Year:
2021,
Volume and Issue:
31(40)
Published: July 10, 2021
Abstract
Luminescent
metal
halide
materials
with
flexible
crystallography/electronic
structures
and
tunable
emission
have
demonstrated
broad
application
prospects
in
the
visible
light
region.
However,
designing
near‐infrared
(NIR)
light‐emitting
halides
remains
a
challenge.
Here,
an
enlightening
prototype
is
proposed
to
explore
high‐efficiency
broadband
NIR
systems
by
incorporating
Sb
3+
into
Cs
2
ZnCl
4
matrix.
Combined
experimental
analysis
density
functional
theory
calculations
reveal
modified
self‐trapped
excitons
model
elaborate
emission.
The
high
photoluminescence
quantum
yield
of
69.9%
peaking
at
745
nm
large
full
width
half
maximum
175
nm,
along
excellent
air/thermal
stability,
show
unique
advantages
lead‐free
:Sb
as
source.
substitution
Cl
−
Br
further
enables
red‐shift
peak
from
823
nm.
diode
device
based
on
demonstrates
potential
non‐visible
source
night
vision.
This
study
puts
forward
effective
strategy
design
novel
eco‐friendly
emissive
provides
guidance
for
expanding
scope
luminescent
halides.
Angewandte Chemie International Edition,
Journal Year:
2020,
Volume and Issue:
60(21), P. 11592 - 11603
Published: Oct. 21, 2020
Lead-free
halide
perovskites
have
drawn
wide
attention
as
alternatives
to
their
toxic
and
poorly
stable
lead-based
counterparts.
Among
them,
double
with
Cs2
AgInCl6
composition,
often
doped
various
elements,
been
in
the
spotlight
owing
intriguing
optical
properties,
namely,
self-trapped
exciton
(STEs)
emission
dopant-induced
photoluminescence.
This
interest
has
sparked
different
synthesis
approaches
towards
both
crystals
nanocrystals,
exploration
of
many
alloy
compositions
mono-
trivalent
cations
other
than
Ag+
In3+
.
In
this
Minireview
we
describe
recent
developments
on
bulk
strategies,
intrinsic
tunable
photoluminescence
originating
from
alloying
doping
effects.
We
also
discuss
progress
computational
studies
aimed
at
understanding
thermodynamic
stability,
role
defects,
origin
relation
STEs
direct
band
gap
character.
Inorganic Chemistry Frontiers,
Journal Year:
2020,
Volume and Issue:
7(6), P. 1467 - 1473
Published: Jan. 1, 2020
LaMgGa11O19:Cr3+
phosphor
was
synthesized
successfully,
showing
broadband
NIR
emission
centered
at
∼770
nm,
high
efficiency
and
excellent
thermal
quenching
resistance
for
pc-LEDs.
Abstract
The
development
of
highly
efficient
and
thermally
stable
broadband
near‐infrared
(NIR)
luminescence
materials
is
a
great
challenge
to
advance
the
next‐generation
smart
NIR
light
source.
Benefitting
from
low
phonon
energy
relatively
weak
electron
coupling
effect
fluoride,
K
2
NaScF
6
:Cr
3+
phosphor
designed
obtained,
which
demonstrates
full
width
at
half
maximum
100
nm
peaking
≈765
nm.
Upon
blue
excitation,
exhibits
high
quantum
efficiency
74%
its
emission
intensity
150
°C
can
keep
89.6%
initial
value
25
°C.
An
output
power
159.72
mW
(input
electric
power,
1094
mW)
with
photoelectric
conversion
≈14.60%,
light‐emitting
diode
(LED)
device
presented
based
on
this
phosphor.
Furthermore,
applying
high‐power
phosphor‐converted
LED
as
lighting
source,
clear
quick
veins
imaging
recognition
in
fingers,
palm,
wrist,
arm
human
hand
are
first
realized,
suggesting
has
promise
practical
applications.
Journal of Materials Chemistry C,
Journal Year:
2020,
Volume and Issue:
9(1), P. 164 - 172
Published: Nov. 10, 2020
GdAl3(BO3)4:Cr3+is
used
to
fabricate
a
NIR-pc-LED
that
shows
promise
for
plant
lighting
and
applications
in
the
nondestructive
analysis
of
agricultural
products.
