Zero-dimensional
lead
halide
perovskite
nanocrystals
(NCs)
exhibit
size-dependent
bandgap
and
carrier
confinement
compared
to
bulk
counterparts
due
the
quantum
effect,
making
them
essential
for
achieving
wide-color-gamut
displays,
studying
excitonic
spin
relaxation,
constructing
superlattices.
Despite
their
promising
potential,
they
face
a
variety
of
technical
bottlenecks,
such
as
insufficient
color
reproducibility,
limited
large-scale
production,
low
stability,
toxicity.
An
outline
research
roadmap
is
provided
in
review,
which
highlights
key
challenges
developing
NCs
commercial
applications.
Advanced Materials,
Год журнала:
2024,
Номер
36(25)
Опубликована: Апрель 4, 2024
Suppressing
trap-assisted
nonradiative
losses
through
passivators
is
a
prerequisite
for
efficient
perovskite
light-emitting
diodes
(PeLEDs).
However,
the
complex
bonding
between
and
perovskites
severely
suppresses
passivation
process,
which
still
lacks
comprehensive
understanding.
Herein,
number,
category,
degree
of
bonds
different
functional
groups
are
quantitatively
assessed
to
study
dynamics.
Functional
with
high
electrostatic
potential
large
steric
hindrance
prioritize
strong
organic
cations
halides
on
perfect
surface,
leading
suppressed
coordination
bulky
defects.
By
modulating
binding
priorities
capacity,
from
intense
interaction
significantly
reduced,
more
direct
process.
Consequently,
near-infrared
PeLED
without
external
light
out-coupling
demonstrates
record
quantum
efficiency
24.3%
at
current
density
42
mA
cm
Nanoscale,
Год журнала:
2024,
Номер
16(8), С. 3838 - 3880
Опубликована: Янв. 1, 2024
This
review
summarizes
the
significance,
behaviors,
and
passivation
strategies
of
defects
under
electric
field
in
perovskite
materials
optoelectronic
devices.
Perovskite
films
feature
unique
optoelectronic
properties,
rendering
them
promising
for
electronic
devices.
The
properties
depend
on
the
morphology
a
broad
range
of
length
scales
from
nanometers
to
millimeters,
influenced
by
variety
factors.
However,
controlling
is
challenging.
A
tailored
supramolecular
additive,
N,
N'-bis(2-aminoethyl)
terephthalamide
developed
control
intermediate
and
perovskite
crystallization
methyl
ammonium
lead
iodide
(MAPbI3)
enhance
thermal
moisture
stability
in
final
film.
Reversible
coordinative
interactions
carbonyl
groups
with
Pb2+
ions
via
Lewis
acid-base
adduct
subsequent
ion-ion
peripheral
grain
boundaries
are
combined
which
stabilized
strong
hydrogen
bonding
pattern
formed
between
amide
moieties
additive
molecules.
Adding
low
amounts
this
precursor
solution
significantly
decelerates
structure
formation
systematically
reduces
crystallite
size.
Slower
growth
phases
incorporation
boundary
observed
multiple
time-resolved
techniques.
Evidence
single-molecule
interlayers
MAPbI3
crystals
presence
directed
interaction
molecules
shown.
Transferability
approach
other
perovskites
anticipated,
paving
way
improved
processing
stability.
Journal of Semiconductors,
Год журнала:
2025,
Номер
46(4), С. 042103 - 042103
Опубликована: Апрель 1, 2025
Abstract
The
quantum
confinement
effect
fundamentally
alters
the
optical
and
electronic
properties
of
dots
(QDs),
making
them
versatile
building
blocks
for
next-generation
light-emitting
diodes
(LEDs).
This
study
investigates
how
governs
charge
transport,
exciton
dynamics,
emission
efficiency
in
QD-LEDs,
using
CsPbI
3
QDs
as
a
model
system.
By
systematically
varying
QD
sizes,
we
reveal
size-dependent
trade-offs
LED
performance,
such
enhanced
smaller
but
increased
brightness
stability
larger
under
high
current
densities.
Our
findings
offer
critical
insights
into
design
high-performance
paving
way
scalable
energy-efficient
optoelectronic
devices.
Nano Letters,
Год журнала:
2023,
Номер
24(1), С. 417 - 423
Опубликована: Дек. 27, 2023
Spectrally
stable
pure-red
perovskite
quantum
dots
(QDs)
with
low
lead
content
are
essential
for
high-definition
displays
but
difficult
to
synthesize
due
QD
self-purification.
Here,
we
make
use
of
entropy-driven
quantum-confined
QDs
fabricate
light-emitting
diodes
(LEDs)
that
have
toxicity
and
efficient
spectrum-stable.
Based
on
experimental
data
first-principles
calculations,
multiple
element
alloying
results
in
a
60%
reduction
while
improving
entropy
promote
crystal
stability.
Entropy-driven
exhibit
photoluminescence
100%
yields
single-exponential
decay
lifetimes
without
alteration
their
morphology
or
structure.
The
LEDs
utilizing
spectrally
electroluminescence,
achieving
brightness
4932
cd/m2,
maximum
external
efficiency
over
20%,
15-fold
longer
operational
lifetime
than
the
CsPbI3
QD-based
LEDs.
These
achievements
demonstrate
can
mitigate
local
compositional
heterogeneity
ion
migration.
National Science Open,
Год журнала:
2023,
Номер
2(3), С. 20220065 - 20220065
Опубликована: Фев. 27, 2023
Due
to
the
advantages
of
adjustable
structure,
high
porosity
and
rich
active
centers,
metal-organic
frameworks
(MOFs)
have
received
extensive
attention.
Meanwhile,
perovskite
has
attracted
researchers’
interest
due
its
unique
emission
quantum
yield
excellent
optoelectronic
properties.
However,
instability
under
certain
conditions
hinders
more
comprehensive
development.
Fortunately,
a
novel
strategy
is
encapsulate
in
pores
MOFs
protect
it
from
external
interference
increase
thus
improving
performance
perovskite@MOF
composites.
In
this
review,
latest
research
progress
synthesis
strategy,
function
application
composites
are
systematically
summarized.
Additionally,
challenges
further
developing
discussed.
Hopefully,
review
will
provide
some
creative
inspiration
advance
future
studies
on
emerging
field.
Advanced Optical Materials,
Год журнала:
2023,
Номер
11(14)
Опубликована: Апрель 21, 2023
Abstract
Performance
of
blue
solution‐processed
perovskite
light‐emitting
diodes
(LEDs)
is
limited
by
availability
materials.
Herein,
4‐(trifluoromethyl)benzoyl
ammonium
bromide
(4‐TMBABr)
used
with
abundant
NH
and
CO
groups
to
passivate
the
defects
produce
highly
stable
PEA
x
PA
2‐x
(CsPbBr
3
)
n‐1
PbBr
4
perovskites
for
LED
applications.
The
group
in
4‐TMBABr
suppresses
Br‐ion
mismatch
through
hydrogen
bonds
(N‐H···Br)
coordinates
unsaturated
lead
dangling
(CO:Pb).
effective
defect
passivation
reduces
nonradiative
recombination
films,
hence
enhancing
its
optical
performance.
In
structure,
sodium
bis(trifluoromethanesulfonyl)imide
(SBTI)
modified
NiO
films
are
improve
hole
transport
inhibit
fluorescence
quenching
layer.
dual‐defect
manipulation
strategy
advantageous
producing
efficient
spectrally
LEDs,
authors
demonstrate
an
maximum
luminance
1094
cd
m
−2
external
quantum
efficiency
10.3%.
This
work
can
inform
underpin
future
development
LEDs
stabile
Metal-halide
perovskite
nanocrystals
(NCs)
have
emerged
as
suitable
light-emitting
materials
for
diodes
(LEDs)
and
other
practical
applications.
However,
LEDs
with
NCs
undergo
environment-induced
ion-migration-induced
structural
degradation
during
operation;
therefore,
novel
NC
design
concepts,
such
hermetic
sealing
of
the
NCs,
are
required.
Thus
far,
viable
synthetic
conditions
to
form
a
robust
semiconducting
shell
on
been
rarely
reported
LED
applications
because
difficulties
in
delicate
engineering
encapsulation
techniques.
Herein,
highly
bright
durable
deep-blue
(PeLED)
formed
by
hermetically
epitaxial
ZnS
shells
is
reported.
This
protects
from
environment,
facilitates
charge
injection/transport,
effectively
suppresses
interparticle
ion
migration
operation,
resulting
exceptional
brightness
(2916
cd
m-2
)
at
451
nm
high
external
quantum
efficiency
1.32%.
Furthermore,
even
unencapsulated
state,
shows
long
operational
lifetime
(T50
1192
s
(≈20
min)
air.
These
results
demonstrate
that
powerful
strategy
fabricating
high-performance
deep-blue-emitting
PeLEDs.
