Journal of Materials Chemistry C,
Год журнала:
2022,
Номер
10(27), С. 10047 - 10057
Опубликована: Янв. 1, 2022
A
novel
near-infrared
phosphor
Mg
2
InSbO
6
:Cr
3+
with
high
quantum
efficiency
and
considerable
persistent
luminescence
duration
is
successfully
prepared.
Laser & Photonics Review,
Год журнала:
2022,
Номер
16(11)
Опубликована: Авг. 7, 2022
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.
The Journal of Physical Chemistry Letters,
Год журнала:
2022,
Номер
13(22), С. 5001 - 5008
Опубликована: Июнь 1, 2022
Broadband
near-infrared
(NIR)
light
sources
based
on
phosphor-converted
light-emitting
diodes
(pc-LEDs)
are
desirable
for
various
photonics
applications,
while
developing
thermally
stable
NIR
phosphors
remains
a
great
challenge.
Increasing
the
temperature
accelerates
severe
nonradiative
relaxation
process
gorverned
by
intrinsic
energy
gap
law,
which
further
suspends
efficient
low-energy
emission
of
Cr3+
emitters
in
inorganic
lattice.
To
address
this
rule,
several
state-of-the-art
strategies
have
been
put
forward
perspective
to
modulate
critical
law
from
viewpoints
(1)
crystal
structure
design,
(2)
defect
engineering,
(3)
strengthened
rigidity,
and
(4)
transfer.
This
suggests
avenues
exploring
novel
broadband
with
high
thermal
stability
will
also
stimulate
studies
spectroscopy
high-power
applications.
Chemistry of Materials,
Год журнала:
2022,
Номер
34(18), С. 8418 - 8426
Опубликована: Сен. 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.
Chemistry of Materials,
Год журнала:
2022,
Номер
34(7), С. 3006 - 3012
Опубликована: Март 29, 2022
Lead-free
halide
perovskite
nanocrystals
(NCs)
have
attracted
more
attention
and
demonstrated
versatile
potential
in
optoelectronic
applications.
However,
achieving
broadband
near-infrared
(NIR)
emission
such
materials
remains
a
challenge.
Herein,
we
successfully
obtained
Cr3+-doped
Cs2AgInCl6
NCs
via
hot-injection
synthesis,
which
exhibits
NIR
with
large
full
width
at
half-maximum
of
193
nm.
Furthermore,
tunable
from
998
to
958
nm
along
an
enhanced
photoluminescence
quantum
yield
19.7%
is
realized
by
gradually
substituting
Ag+
Na+,
the
blue
shift
luminescence
behavior
attributed
strengthened
crystal
field
around
Cr3+.
The
excellent
chemical
moisture
stability
together
as-fabricated
Cs2NaInCl6:Cr3+
NC
film
made
screen
printing
showcases
its
application
high-resolution
images
fluorescent
signs.
This
work
proves
possibility
realizing
lead-free
provides
guidance
for
expanding
their
region.
Advanced Materials,
Год журнала:
2023,
Номер
36(9)
Опубликована: Ноя. 8, 2023
Abstract
There
is
strong
demand
for
ultraefficient
near‐infrared
(NIR)
phosphors
with
adjustable
emission
properties
next‐generation
intelligent
NIR
light
sources.
Designing
large
full‐width
at
half‐maximum
(FWHM)
variations
challenging.
In
this
study,
novel
near‐ultraviolet
light‐emitting
diode
(LED)‐excited
phosphors,
MgAlGa
0.7
B
0.3
O
4
:Cr
3+
(MAGBO:Cr
),
three
centers
achieve
ultra‐narrowband
(FWHM
=
29
nm)
to
ultra‐broadband
260
increasing
Cr
concentration.
Gaussian
fitting
and
decay
time
analysis
reveal
the
alteration
in
FWHM,
which
attributed
energy
transfer
occurring
between
centers.
The
distinct
thermal
quenching
behaviors
of
are
revealed
through
temperature‐dependent
times.
phosphor
MAGBO:0.05Cr
exhibits
high
stability
(85%,
425
K)
exceptional
external
quantum
efficiency
68.5%.
An
phosphor‐converted
LED
(pc‐LED)
fabricated
using
phosphor,
exhibiting
a
remarkable
output
power
136
mW
600
mA
pc‐LEDs.
This
study
describes
preparation
highly
efficient
provides
further
understanding
tunable
vital
high‐performance
versatile
applications.
Advanced Optical Materials,
Год журнала:
2023,
Номер
11(24)
Опубликована: Окт. 11, 2023
Abstract
Transition
metal
chromium
(Cr)
ion‐doped
inorganic
materials
exhibit
distinct
tunable
broadband
near‐infrared
luminescence,
and
they
have
promising
applications
including
nondestructive
composition
analysis,
night
vision,
biomedicine,
plant
illumination,
afterglow
anticounterfeiting.
Currently,
the
most
critical
issue
is
to
optimize
their
full
width
at
half
maxima,
thermal
stability,
internal/external
quantum
efficiency.
This
review
systematically
summarizes
strategies
effectively
improve
photoluminescence
performance
of
near‐infrared‐emitting
with
transition
ions.
Key
examples
design
preparation
Cr
luminescence
different
modes,
a
detailed
discussion
properties
luminescent
materials,
summary
generic
help
explore
novel
efficient
Cr‐doped
phosphor
are
provided.
Next,
latest
developments
trends
in
these
presented
for
variety
application
scenarios.
Finally,
future
research
directions
new
challenges
faced
also
discussed.
ACS Applied Materials & Interfaces,
Год журнала:
2024,
Номер
16(23), С. 30185 - 30195
Опубликована: Май 31, 2024
Broadband
near-infrared
(NIR)
phosphor-converted
light-emitting
diodes
(pc-LEDs)
hold
promising
potential
as
next-generation
compact,
portable,
and
intelligent
NIR
light
sources.
Nonetheless,
the
lack
of
high-performance
broadband
phosphors
with
an
emission
peak
beyond
900
nm
has
severely
hindered
development
widespread
application
pc-LEDs.
This
study
presents
a
strategy
for
precise
control
energy-state
coupling
in
spinel
solid
solutions
composed
MgxZn1–xGa2O4
to
tune
emissions
Cr3+
activators.
By
combining
crystal
field
engineering
heavy
doping,
Cr3+–Cr3+
ion
pair
from
4T2
state
is
unlocked,
giving
rise
unusual
spanning
650
1400
maximum
913
full
width
at
half-maximum
(fwhm)
213
nm.
Under
optimal
Mg/Zn
ratio
4:1,
sample
achieves
record-breaking
performance,
including
high
internal
external
quantum
efficiency
(IQE
=
83.9%
EQE
35.7%)
excellent
thermal
stability
(I423
K/I298
K
75.8%).
Encapsulating
as-obtained
into
prototype
pc-LEDs
yields
overwhelming
output
power
124.2
mW
driving
current
840
mA
photoelectric
conversion
(PCE)
10.5%
30
mA,
rendering
performance
imaging
applications.
Inorganic Chemistry,
Год журнала:
2022,
Номер
61(23), С. 8815 - 8822
Опубликована: Июнь 1, 2022
Broadband
near-infrared
(NIR)
phosphor-converted
light-emitting
diodes
(pc-LEDs)
are
essential
to
integrate
spectrometers
into
mobile
devices
for
the
rapid
and
noninvasive
detection
of
biological
components.
However,
efficient
broadband
NIR
phosphors
with
a
peak
emission
wavelength
longer
than
800
nm
deficient.
In
this
study,
CaMgGe2O6:Cr3+
phosphor
was
prepared
by
high-temperature
solid-state
reaction.
The
doped
0.02Cr3+
showed
an
band
at
845
broad
bandwidth
160
high
quantum
yield
84%
under
450
excitation.
pc-LED
fabricated
using
CaMgGe2O6:0.02Cr3+
based
on
blue
diode
(LED)
chip.
A
photoelectric
efficiency
27.2%
@
10
mA
output
power
57.98
mW
100
were
achieved,
which
highest
values
reported
yet
pc-LEDs
nm.
Using
as
light
source,
characteristic
absorption
spectra
some
substances
obtained.
All
results
indicated
that
has
considerable
potential
in
spectroscopic
applications.