Advanced Optical Materials,
Год журнала:
2024,
Номер
12(30)
Опубликована: Авг. 13, 2024
Abstract
Recently,
all‐inorganic
halide
double
perovskites
(DPs)
with
a
chemical
formula
of
Cs
2
B
I
III
X
6
have
been
emerging
as
shinning
star
to
be
used
in
modern
optoelectronic
devices,
due
their
unique
advantages
such
environmentally
friendly,
high
absorption
coefficient,
low
trap
densities,
tunable
bandgap,
variable
constituent
elements
and
valences
states
through
or
sites
engineering.
In
this
review,
first,
the
impact
cation
doping
on
electronic
structure
optical
properties
DPs
are
systematically
overviewed,
which
cover
several
key
issues
including
interconversion
between
direct
indirect
band
gaps,
enhancement
light
absorption,
promotion
exciton
localization,
elucidation
energy
transfer
mechanisms,
regulation
defect
density
improvement
both
stability
luminescence
efficiency.
Subsequently,
state‐of‐the‐art
research
activities
regarding
interesting
device
applications
discussed,
light‐emitting
diodes,
anticounterfeiting
encryption,
X‐ray
scintillators,
thermometry.
Finally,
existing
difficulties,
prospects,
directions
field
proposed.
Most
lead-free
halide
double
perovskite
materials
display
low
photoluminescence
quantum
yield
(PLQY)
due
to
the
indirect
bandgap
or
forbidden
transition.
Doping
is
an
effective
strategy
tailor
optical
properties
of
materials.
Herein,
efficient
blue-emitting
Sb3+
-doped
Cs2
NaInCl6
nanocrystals
(NCs)
are
selected
as
host,
rare-earth
(RE)
ions
(Sm3+
,
Eu3+
Tb3+
and
Dy3+
)
incorporated
into
excellent
PLQY
80.1%
obtained.
Femtosecond
transient
absorption
measurement
found
that
RE
not
only
served
activator
but
also
filled
deep
vacancy
defects.
Anti-counterfeiting,
thermometry,
white-light-emitting
diodes
(WLEDs)
exhibited
using
these
ions-doped
NCs.
For
thermometry
based
on
Sm3+
:Sb3+
NCs,
maximum
relative
sensitivity
0.753%
K-1
which
higher
than
those
most
temperature-sensing
Moreover,
WLED
fabricated
by
NCs@PMMA
displays
CIE
color
coordinates
(0.30,
0.28),
a
luminous
efficiency
37.5
lm
W-1
CCT
8035
K,
CRI
over
80,
indicate
NCs
promising
single-component
phosphors
for
next-generation
lighting
technologies.
Abstract
The
smart
materials
with
multi‐color
and
stimuli‐responsive
luminescence
are
very
promising
for
next
generation
of
optical
information
encryption
anti‐counterfeiting,
but
these
still
scarce.
Herein,
a
multi‐level
strategy
is
developed
based
on
the
polychromatic
emission
Sb‐doped
double
perovskite
powders
(SDPPs).
Cs
2
NaInCl
6
:Sb,
KInCl
AgInCl
:Sb
synthesized
through
coprecipitation
methods
exhibit
broadband
emissions
bright
blue,
cyan,
orange
colors,
respectively.
transmitted
by
specific
SDPP
encrypted
when
different
SDPPs
mixed.
confidential
can
be
decrypted
selecting
corresponding
narrowband
filter.
Then,
an
quick
response
(QR)
code
improved
security
demonstrated
this
multi‐channel
selection
strategy.
Moreover,
three
types
water‐triggered
switching
behaviors.
represented
erased/recovered
simple
water
spray/drying.
Whereas,
collected
from
green
channel
permanently
erased
moisture,
which
fundamentally
avoids
leakage.
Therefore,
schemes
designed
to
meet
variety
requirements.
multicolor
greatly
enrich
flexibility
encryption,
leaps
level
confidentiality.
Advanced Functional Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Апрель 16, 2024
Abstract
Self‐trapped
excitons
(STEs)
of
lead‐free
perovskites
have
aroused
tremendous
interest
in
remote
optical
thermometry
due
to
strong
exciton–phonon
coupling
and
large
Stokes
shifts.
Herein,
a
bright
multimodal
multiplexed
thermometer
is
constructed
with
high
sensitivity
(
S
r
)
self‐calibrating
ability
based
on
Cs
2
NaInCl
6
:Er
3+
double
perovskite,
allowing
for
fast
simplified
reading
via
mobile
devices.
Intriguingly,
Er
doping
not
only
shows
the
characteristic
green
emissions
but
also
introduces
nanoelectronic
domains
through
new
localized
valance
band
maximum
breaks
symmetry
In
site,
which
facilitates
generation
more
STEs.
The
temperature‐sensitive
blue
emission
STEs
temperature‐insensitive
endow
including
time‐resolved
ratiometric
readout
schemes
3.8%
K
−1
,
where
an
upconversion
primary
serves
as
reference
calibrate
other
modes.
Meanwhile,
designed
thermometers
show
robust
photostability,
repeatability,
structural
stability
long‐time
working
storage.
addition,
remarkable
thermochromic
phenomenon
from
enables
quick
color‐multiplexed
thermography
smartphone,
utilized
capture
real‐time
2D
thermal
imaging
microelectronic
This
work
demonstrates
great
potential
perovskite
low‐cost
portable
thermometry.
Advanced Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 29, 2025
Abstract
Light‐emitting
diodes
(LEDs)
based
on
halide
perovskite
nanocrystals
have
attracted
extensive
attention
due
to
their
considerable
luminescence
efficiency,
wide
color
gamut,
high
purity,
and
facile
material
synthesis.
Since
the
first
demonstration
of
LEDs
MAPbBr
3
was
reported
in
2014,
community
has
witnessed
a
rapid
development
performances.
In
this
review,
historical
perspective
is
provided
then
comprehensive
survey
current
strategies
for
high‐efficiency
lead‐based
LEDs,
including
synthesis
optimization,
ion
doping/alloying,
shell
coating
presented.
Then
basic
characteristics
emission
mechanisms
lead‐free
perovskite‐related
emitters
environmentally
friendly
from
standpoint
different
colors
are
reviewed.
Finally,
progress
LED
applications
covered
an
outlook
opportunities
challenges
future
developments
field
provided.
Advanced Functional Materials,
Год журнала:
2024,
Номер
34(45)
Опубликована: Авг. 8, 2024
Abstract
The
study
on
phosphors‐converted
white
light‐emitting
diodes
(pc‐WLEDs)
using
lead‐free
double
perovskites
(DPs)
as
single‐component
phosphors
is
widely
concerned.
However,
the
photoluminescence
quantum
yields
(PLQY)
of
luminescence
and
color
rendering
index
(CRI)
WLED
are
not
satisfactory.
Herein,
a
new
Sb/Ho:
Cs
2
Na
0.9
Ag
0.1
(In/Bi)Cl
6
phosphor
with
highest
PLQY
93%
record
CRI
97.4
reported.
Experimental
data
theoretical
calculations
evidence
that
in
addition
to
broadband
yellow
emission
self‐trapped
exciton
(STE)
recombination,
material
also
exhibits
blue
from
Sb
3+
:
3
P
1
→
S
0
transition
red
one
assigned
Ho
5
F
I
8
transition.
Steady‐state
time‐resolved
PL
spectra
verify
existence
two
energy
transfer
channels
both
STE
dopants.
As
demo,
(In/Bi)
Cl6‐based
constructed,
showing
excellent
comprehensive
optical
performance
specially
improved
saturation
R9
R12.
This
work
provides
novel
rare‐earth
doped
DP
for
high
full‐spectrum
solid‐state
lighting.
Angewandte Chemie International Edition,
Год журнала:
2024,
Номер
63(29)
Опубликована: Май 6, 2024
Abstract
Hybrid
metal
halides
are
an
extraordinary
class
of
optoelectronic
materials
with
extensive
applications.
To
further
diversify
and
study
the
in‐depth
structure‐property
relations,
we
report
here
a
new
family
21
zero‐dimensional
hybrid
bimetallic
chlorides
general
formula
A
(
L
)
n
[
B
Cl
m
]
=rare
earth
RE
),
alkaline
metals
Mn;
=solvent
ligand;
=Sb,
Bi
Te).
The
(DMSO)
8
6
=La,
Ce,
Sm,
Eu,
Tb,
Dy;
DMSO=dimethyl
sulfoxide)
series
shows
broadband
emission
attributed
to
triplet
radiative
recombination
from
Sb
Bi,
incorporating
characteristic
metals,
where
Eu(DMSO)
[BiCl
staggering
PL
quantum
yield
94
%.
pseudo‐octahedral
[SbCl
5
vacancy
in
II
=Mg,
Ca
Mn)
square
pyramidal
(TMSO)
(TMSO=tetramethylene
enhance
stereoactive
expression
s
2
lone
pairs
3+
,
giving
rise
observation
dual‐band
singlet
emission,
respectively.
Te(IV)
analogues
have
been
characterized,
showing
blue‐light‐excitable
single‐band
emission.
This
work
expands
space
for
emphasis
on
harnessing
elements,
provides
important
insights
into
designing
emitters
regulating
their
properties.
ACS Applied Materials & Interfaces,
Год журнала:
2024,
Номер
16(24), С. 31332 - 31340
Опубликована: Июнь 4, 2024
Lead-free
halide
double
perovskites
(DPs)
have
become
a
research
hotspot
in
the
field
of
photoelectrons
due
to
their
unique
optical
properties
and
flexible
compositional
tuning.
However,
reports
on
DPs
primarily
concentrate
room
temperature
state
only
exhibit
single
emission
band.
Here,
we
synthesized
Cs2NaYCl6:Sb3+,
Dy3+
by
solvothermal
method
realize
white
light
with
photoluminescence
(PL)
quantum
yield
as
high
70.7%.
The
energy-transfer
process
from
self-trapped
excitons
(STEs)
ions
was
revealed
characterization
theoretical
simulation
calculations.
Interestingly,
observed
double-emission
low-energy
STE
Sb3+
at
low
temperatures,
is
consistent
asymmetric
doublet
feature
3P1
→
1S0
transition
split
into
two
minima.
PL
spectra
further
showed
that
fluorescence
intensity
ratios
580
680
nm
were
strongly
temperature-dependent,
relative
sensitivity
up
1.79%
K–1
360
K.
Moreover,
near-infrared
radiation
luminescence
indicated
also
good
prospects
for
night
vision
detection,
well
great
potential
applications
solid-state
illumination
measurement.
Abstract
Rare‐earth
halide
double
perovskites
(DPs)
have
attracted
extensive
attention
due
to
their
excellent
optoelectronic
performance.
However,
the
correlation
between
luminescence
performance,
crystal
structure,
and
temperature,
as
well
inherent
energy
transfer
mechanism,
is
not
understood.
Herein,
Lanthanide
ions
(Ln
3+
:
Nd
or
Dy
)
co‐dopants
are
incorporated
into
Sb
doped
Cs
2
NaYbCl
6
DPs
construct
(ET)
models
reveal
effects
of
temperature
levels
rare
earth
on
ET.
The
different
excited
state
structures
‐Ln
at
temperatures
relative
positions
synergistically
determine
physical
processes
luminescence.
These
multi‐mode
luminescent
materials
exhibit
good
performance
in
anti‐counterfeiting,
NIR
imaging,
sensing.
This
work
provides
new
insights
mechanism
related
photophysical
process.
