Due
to
intrinsic
defects
in
blue-light-emitting
perovskite
materials,
the
charge
carriers
are
prone
being
trapped
by
trap
states.
Therefore,
preparation
of
efficient
materials
remains
a
significant
challenge.
Herein,
CsPb(Cl/Br)3
nanocrystal
(NCs)@SiO2
structures
were
fabricated
through
hydrolyzing
(3-aminopropyl)-triethoxysilane
(APTS).
SiO2
can
passivate
surface
states
NCs,
suppress
nonradiative
recombination
pathways
and
effectively
stabilize
NCs.
NCs@SiO2
exhibits
higher
photoluminescence
(PL)
intensity
lifetime
compared
those
pure
The
enhancement
exciton
binding
energy
(Eb)
leads
increased
PL
NCs
@SiO2,
as
demonstrated
temperature-dependent
spectra.
Subsequently,
0.3
mm
film
NCs@SiO2/poly(methyl
methacrylate)
(PMMA)
was
optimizing
casting
method.
effective
protection
provided
PMMA,
NCs@SiO2/PMMA
excellent
thermal,
water,
air
stability.
Moreover,
also
good
flexibility,
maintaining
unchanged
under
bending
conditions.
Importantly,
lead
be
well
encapsulated
preventing
from
leaking
into
environment.
This
research
demonstrates
potential
for
applications
friendly
environmental
field
optoelectronics,
including
light-emitting
diodes
(LEDs)
flexible
displays.
Light-emitting
colloidal
lead
halide
perovskite
nanocrystals
(PeNCs)
are
considered
promising
candidates
for
next-generation
vivid
displays.
However,
the
operational
stability
of
light-emitting
diodes
(LEDs)
based
on
PeNCs
is
still
lower
than
those
polycrystalline
films,
which
requires
an
understanding
defect
formation
in
PeNCs,
both
inside
crystal
lattice
("bulk")
and
at
surface.
Meanwhile,
uncontrollable
ion
redistribution
electrochemical
reactions
under
LED
operation
can
be
severe,
also
related
to
bulk
surface
quality
a
well-designed
device
architecture
boost
carrier
injection
balance
radiative
recombination.
In
this
review,
we
consider
reconstruction
by
enhancing
rigidity
rationally
selecting
ligands.
Degradation
pathways
applied
voltage
discussed,
strategies
avoid
undesirable
migration
PeNC
films.
Subsequently,
other
critical
issues
hindering
commercial
application
LEDs
including
toxicity
Pb
perovskites,
scale-up
deposition
design
active-matrix
prototypes
high-resolution
modules.
Colloidal
quantum
dots
(QDs)
have
illuminated
computer
monitors
and
television
screens
due
to
their
fascinating
color-tunable
properties
depending
on
the
size.
Here,
electroluminescence
(EL)
wavelength
of
perovskite
LEDs
was
tuned
via
atomic
layer
number
(ALN)
nanoplates
(NPs)
instead
"size"
in
conventional
QDs.
We
demonstrated
efficient
with
controllably
tailored
emission
from
n
=
3,
4,
5,
≥7
ALN
NPs
specific
discrete
major
peaks
at
607,
638,
669,
728
nanometers.
These
peak
external
efficiency
(EQE)
26.8%
high
reproducibility
less
than
1
2
nm
difference
between
batches.
High
color
stability
without
observable
EL
spectral
change
operating
best
T50
267
minutes
1.0
milliampere
per
square
centimeter
also
achieved.
This
work
demonstrates
a
concept
tailoring
fixed
wavelengths,
shedding
light
efficient,
emission-discrete,
color-stable
for
next-generation
display.
Mixed-halide
perovskite
plays
important
role
in
wide-color
gamut
displays
as
a
vital
material
for
three
primary
colors.
However,
halide
segregation
and
caused
unstable
spectra
are
the
intrinsic
problem
mixed-halide
light-emitting
diodes
(PeLEDs)
originating
from
lattice
strain
resulting
defects
quantum
dots
(PQDs).
Here,
smaller
transition
metal
cations
applied
to
replace
Pb2+
release
strain,
which
avoids
halogen
escaping/halide
vacancies
forming
ensure
high
photoluminescence
yield
(PLQY)
stable
spectra.
actual
doping
amount
is
limited
by
ionic
size
chemical
environment,
will
affect
improvement
of
optoelectronic
performance.
Thus,
this
study
proposes
strategy
introducing
tri-n-octylphosphine
coordinate
strongly
with
catch
them
participate
nucleation-growth
process.
Through
effectively,
CsPb(BrI)3
PQDs
show
PLQY
(92%)
long
lifetime
(107.83
ns).
Further,
highly
efficient
pure-red
PeLEDs
highest
external
efficiency
16.86%
fabricated
spectrum
can
be
stabilized
at
630
nm
only
1
red-shift
under
bias,
showing
promising
potential
next-generation
display.
ACS Applied Materials & Interfaces,
Год журнала:
2025,
Номер
unknown
Опубликована: Март 24, 2025
Producing
nanostructures
on
a
perovskite
film
through
crystallization
modulation
is
essential
to
improving
the
light
outcoupling
efficiency
and
performance
of
blue
light-emitting
diodes
(PeLEDs).
However,
challenge
achieving
films
still
remains.
Herein,
we
demonstrate
that
homogeneous
nano
holes
are
formed
pure-bromide
quasi-2D
because
kinetics
significantly
modulated
by
underneath
mesoporous
buffer
layer
triptycene-like
pyridine
with
biphenyl
substituents
(TPC-LB).
This
nonplanar
rigid
stereoscopic
molecular
structure
TPC-LB
provides
ion
channels
in
intermolecular
intramolecular
cavities
effectively
confine
components
perovskite.
The
enhance
PeLEDs.
champion
device
shows
maximum
luminance
2004
cd
m-2
peak
external
quantum
12.08%,
which
locates
top
rank
similar
devices
three
times
higher
than
control
device.
work
demonstrates
an
effective
strategy
improve
PeLEDs,
significance
for
promoting
development
Iodide-based
perovskites
are
severely
limited
in
practical
applications
due
to
their
low
photoluminescence
quantum
yield
(PLQY),
tendency
undergo
phase
separation,
and
severe
PL
quenching
the
solid
state.
Herein,
a
bilayer
core-shell
structured
perovskite
nanocomposite
containing
Br
I
(BINC),
based
on
Förster
resonance
energy
transfer
(FRET),
is
prepared.
In
BINC
structure,
embedded
silica
titanium
dioxide
define
Si-BINC
Ti-BINC
structures,
respectively,
serving
as
barrier
between
donor
(CsPbBr3)
acceptor
(CsPbI3),
which
prevents
migration
of
halide
ions.
Additionally,
TiO2
acts
electron
transport
layer,
facilitating
electrons
from
CsPbBr3
TiO2,
then
CsPbI3.
The
outermost
layer
SiO2
enhances
environmental
stability
structure.
Both
intensity
lifetime
at
687
nm
structures
increase
compared
with
those
improvement
these
optical
properties
primarily
attributed
FRET
effect.
transient
absorption
(TA)
spectra
structure
shows
faster
ground
state
bleaching
(GSB,
∼669
nm)
signal
decay
rate
than
that
Ti-BINC.
rapid
photogenerated
carriers
indicates
it
suitable
for
high-efficiency
fast-response
LEDs
photodetectors.
displays
stronger
GSB
slower
Si-BINC.
This
more
stable
optoelectronic
conversion
devices,
such
solar
cells
photocatalysis.
investigation
reveals
exhibit
unique
properties,
providing
insights
design
efficient
composite
devices.
ACS Applied Materials & Interfaces,
Год журнала:
2025,
Номер
unknown
Опубликована: Июнь 3, 2025
High-performance
pure-red
perovskite
light-emitting
diodes
(PeLEDs)
are
promising
candidates
for
optoelectronic
applications
due
to
their
remarkable
photophysical
properties.
However,
the
unstable
surface
and
insulating
long-chain
capping
ligands
of
quantum
dots
(QDs)
pose
challenges
commercialization
by
compromising
stability
performance.
Here,
a
simple
but
effective
approach
was
demonstrated
synthesize
highly
stable
red
CsPbI3
QDs
introducing
multifunctional
molecule,
phenformin
hydrochloride
(PhenHCl),
as
an
additive
ligand.
While
biguanide
functional
group
in
PhenHCl
formed
multiple
hydrogen-bond
interactions
with
lead
halide
octahedron,
excess
Cl-
anions
compensated
iodine
vacancies
eliminated
trap
states
QDs.
The
synergistic
effect
halogen
compensation
significantly
passivated
defects
QDs,
yielding
photoluminescence
(PL)
yield
98.6%
excellent
ambient
90%
PL
intensity
retention
over
80
days.
resulting
PeLEDs
based
on
PhenHCl-treated
were
show
enhancement
electroluminescence
performance
at
around
649
nm,
external
efficiency
13.38%,
maximum
luminance
2159
cd
m-2.
Our
findings
this
work
provide
avenue
modulating
chemistry
enhance
PeLEDs.
Journal of Materials Chemistry C,
Год журнала:
2024,
Номер
unknown
Опубликована: Янв. 1, 2024
This
work
presents
green-emitting
CsPbI
3
nanorods
decorated
Cs
4
PbI
6
and
CsPb
2
I
5
nanoclusters
with
a
color-tuning
approach
via
multiple-phase
combinations
without
changing
elements.
These
materials
have
stable
emission
color
purity.
