Nano Letters,
Journal Year:
2023,
Volume and Issue:
24(1), P. 417 - 423
Published: Dec. 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.
ACS Applied Materials & Interfaces,
Journal Year:
2024,
Volume and Issue:
16(19), P. 24908 - 24919
Published: May 6, 2024
Perovskite
nanocrystal
(PeNC)
arrays
are
showing
a
promising
future
in
the
next
generation
of
micro-light-emitting-diode
(micro-LED)
displays
due
to
narrow
emission
linewidth
and
adjustable
peak
wavelength.
Electrohydrodynamic
(EHD)
inkjet
printing,
with
merits
high
resolution,
uniformity,
versatility,
cost-effectiveness,
is
among
competent
candidates
for
constructing
PeNC
arrays.
However,
fabrication
red
light-emitting
CsPbBrxI(3–x)
micro-LED
still
faces
challenges,
such
as
low
brightness
poor
stability.
This
work
proposes
design
colloidal
ink
that
specialized
EHD
printing
three-dimensional
enhanced
luminescence
stability
well
being
adaptable
both
rigid
flexible
substrates.
Made
mixture
PeNCs,
polymer
polystyrene
(PS),
nonpolar
xylene
solvent,
enables
precise
control
array
sizes
shapes,
which
facilitates
on-demand
micropillar
construction.
Additionally,
inclusion
PS
significantly
increases
environmental
By
adopting
this
ink,
printer
successfully
fabricated
full-color
3D
spatial
resolution
over
2500
ppi.
It
shows
potential
strategy
high-resolution
robust
color
conversion
layers
displays.
Advanced Optical Materials,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 28, 2025
Abstract
Perovskite
light‐emitting
diodes
(PeLEDs)
have
demonstrated
significant
potential
in
the
display
sector,
attributed
to
their
wide
color
gamut,
narrow
emission
spectra,
and
cost‐effectiveness.
Despite
rapid
advancements
red
green
PeLEDs,
attainment
of
high
brightness
external
quantum
efficiency
(EQE)
for
blue
PeLEDs
remains
a
considerable
challenge,
which
substantially
limits
practical
applications
white
lighting
optical
communication.
In
this
study,
method
passivation
quasi‐2D
perovskites
using
hydrazide
derivatives
with
varying
alkyl
chain
lengths
is
presented.
Density
functional
theory
analysis
indicates
that
can
effectively
adsorb
onto
halogen
vacancies,
thereby
reducing
charge
trapping
states
associated
undercoordinated
Pb
2+
.
Experimental
results
demonstrate
optimal
derivative
better
eliminate
non‐radiative
recombination
loss,
suppress
ions
migration,
regulate
phase
distribution,
facilitating
smoother
energy
transfer.
Through
approach,
stable
sky‐blue
are
achieved
an
EQE
14.5%
maximum
luminance
2659
cd
m
−2
This
work
offers
systematic
understanding
additive
design,
will
further
enhance
performance
stability
PeLEDs.
ACS Nano,
Journal Year:
2025,
Volume and Issue:
unknown
Published: March 7, 2025
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.
Nano Letters,
Journal Year:
2023,
Volume and Issue:
24(1), P. 417 - 423
Published: Dec. 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.
