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 Functional Materials,
Год журнала:
2023,
Номер
34(7)
Опубликована: Ноя. 1, 2023
Abstract
All‐inorganic
lead
halide
perovskite
nanocrystals
(NCs)
have
great
optoelectronic
properties
with
promising
applications
in
light‐emitting
diodes
(LEDs),
lasers,
photodetectors,
solar
cells,
and
photocatalysis.
However,
the
intrinsic
toxicity
of
Pb
instability
NCs
impede
their
broad
applications.
Shell‐coating
is
an
effective
method
for
enhanced
environmental
stability
while
reducing
by
choosing
non‐toxic
shell
materials
such
as
metal
oxides,
polymers,
silica,
etc.
multiple
can
be
encapsulated
within
material
a
uniform
epitaxial‐type
growth
well‐isolated
still
challenging.
In
this
work,
lead‐free
vacancy‐ordered
double
Cs
2
SnX
6
(X
=
Cl,
Br,
I)
shells
are
epitaxially
grown
on
surface
CsPbX
3
hot‐injection
method.
The
effectiveness
protection
demonstrated
phase
against
UV
illumination
water.
addition,
photoluminescence
quantum
yields
(PL
QYs)
increase
CsPbCl
CsPbBr
after
shelling
because
type
I
band
alignment
core/shell
materials,
charge
transport
obtained
from
CsPbI
/Cs
SnI
due
to
efficient
separation
II
alignment.
Halide
perovskites
have
potential
for
use
in
next-generation
low-cost,
high-efficiency,
and
highly
color-pure
light-emitting
diodes
(LED)
that
can
be
used
various
applications,
such
as
flat
flexible
displays
solid-state
lighting.
However,
they
still
lag
behind
other
mature
technologies,
organic
LEDs
inorganic
LEDs,
terms
of
performance,
particularly
brightness.
This
is
partly
due
to
the
insulating
nature
long-chain
ligands
control
perovskite-film
morphology.
Herein,
a
1-butyl-3-methylimidazolium
tetrafluoroborate
ionic
liquid
(IL)
incorporated
additive
with
CsPbBr3
perovskite
precursors,
which
results
super-bright
green
light
emitting
diode
(PeLED)
achieving
peak
luminance
3.28
×
105
cd
m-2
only
at
bias
voltage
6
V,
external
quantum
efficiency
13.75%.
achievement
outcome
multirole
support
from
IL
simultaneously
enables
superior
over
morphology,
passivates
defects,
modifies
band
energy
levels,
prevents
ion
migration.
Hence,
this
work
demonstrates
novel
alternative
outperform
conventional
high-performance
PeLED
device
fabrication.
Advanced Functional Materials,
Год журнала:
2024,
Номер
34(27)
Опубликована: Март 4, 2024
Abstract
As
a
fundamental
thermodynamic
parameter,
pressure
serves
as
an
effective
tool
to
control
the
structures
and
properties
of
functional
materials.
To
date,
numerous
pressure‐engineering
methods
have
been
introduced
enhance
perovskite
devices.
This
paper
comprehensively
reviews
advances
in
understanding
effects
on
materials
devices,
encompassing
both
low
high‐pressure
influences.
These
are
categorized
into
six
distinct
groups
based
their
underlying
mechanisms,
detailing
evolution
from
macroscopic
microscopic
levels,
exploring
interplay
between
these
characteristics.
Finally,
current
challenges
offer
insights
future
prospects
for
harnessing
further
develop
structures,
properties,
devices
assessed.
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.
