We
demonstrate
band-edge,
multicolor,
electrochemiluminescence
(ECL)
of
colloidal
silicon
quantum
dots
(SiQDs)
in
a
thin-layer
transparent
two-electrode
cell
configuration.
SiQDs
with
different
size
distributions
are
prepared
by
low-temperature
thermal
cracking
porous
and
subsequent
separation
using
the
gel
permeation
chromatography
technique.
The
consisting
an
organic
solution-dispersed
SiQD
layer
between
two
thin
electrodes
exhibits
orange
to
red
luminescence
at
voltage
∼3
V
depending
on
distribution
SiQDs.
electrochemical
analysis
cyclic
voltammetry
technique
theoretical
calculations
confirm
formation
electric
double
layer,
revealing
that
electron–hole
pair
excitation
cores
occurs
association
collisions
electrically
generated
cations
anions
cell.
Radiative
recombination
excited
pairs
band-edges
size-dependent
electronic
energy
gap
enables
multicolor
ECL
from
Advanced Materials,
Journal Year:
2024,
Volume and Issue:
36(27)
Published: April 17, 2024
Abstract
Perovskite
quantum
dot‐based
light‐emitting
diodes
(QLEDs)
have
been
considered
a
promising
display
technology
due
to
their
wide
color
gamut
for
authentic
expression.
Currently,
the
external
efficiency
(EQE)
state‐of‐the‐art
blue
perovskite
QLEDs
is
about
15%,
which
still
lags
behind
its
green
and
red
counterparts
(>25%)
film‐based
LEDs.
Here,
that
achieve
an
EQE
of
23.5%
at
490
nm
presented,
best
knowledge,
highest
value
reported
among
perovskite‐based
LED
fields.
This
impressive
achieved
through
combination
dot
(QD)
passivation
optimal
device
design.
First,
mixed
halide
CsPbCl
3−
x
Br
QDs
passivated
by
trifluoroacetate
exhibit
excellent
exciton
recombination
behavior
with
photoluminescence
yield
84%
reducing
uncoordinated
Pb
surface
defects.
Furthermore,
designed
introducing
hole‐transport
layer
(M‐HTL)
increase
hole
injection
transportation
capacity
improve
carrier
balance.
It
further
found
M‐HTL
can
decrease
leakage
radiative
in
device,
evidenced
visual
electroluminescence
spectrum
2.0
V.
The
work
breaks
gap
20%
significantly
promotes
commercialization
process.
Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
34(36)
Published: March 5, 2024
Abstract
The
“Nobel
Prize
in
Chemistry
2023”
is
awarded
to
Moungi
G.
Bawendi,
Louis
E.
Brus,
and
Alexey
I.
Yekimov
for
discovering
synthesizing
Quantum
Dots
(QDs).
Colloidal
QDs
possess
fascinating
size‐,
morphological‐,
composition‐,
assembly‐tunable
electronic
optical
properties,
which
makes
them
star
materials
various
optoelectronic
applications,
especially
as
luminescent
next‐generation
wide
color
gamut
ultra‐high‐definition
displays.
Perovskite
(PQDs)
have
gained
widespread
attention
recent
years.
In
less
than
ten
years,
research
on
perovskite‐related
devices
has
basically
been
perfected
terms
of
quantum
yield
external
efficiency
(EQE).
However,
the
eve
its
industrial
application,
some
key
technical
indicators
processes
need
be
met
resolved.
development
transformation
QD
then
focuses
progress
luminescence
linewidth
EQE
PQD
light‐emitting
diode.
Finally,
several
application
avenues
are
reviewed
PQDs,
challenges
opportunities
field
proposed.
ACS Energy Letters,
Journal Year:
2024,
Volume and Issue:
9(3), P. 1133 - 1140
Published: Feb. 23, 2024
Perovskite
light-emitting
diodes
(PeLEDs)
have
recently
achieved
a
great
breakthrough
in
external
quantum
efficiency
(EQE).
However,
the
operational
stability
of
pure
primary
color
PeLEDs
lags
far
behind
because
serious
ion
migration.
Herein,
self-stabilized
quasi-2D
perovskite
is
constructed
with
strategically
synthesized
ion-migration-inhibition
ligand
(IMIligand)
to
realize
highly
stable
and
efficient
green
approaching
standard
light
Rec.
2020.
The
IMIligand
takes
role
not
only
eliminate
migration
pathways
anchor
halide
ions
suppress
but
also
further
enhance
crystalline
orientation
energy
transfer
perovskites.
Meanwhile,
overcomes
degradation
electrical
performance
caused
by
conventional
exogenous
passivation
additives.
Ultimately,
figure
merit
at
least
double
that
previous
works.
devices
achieve
an
EQE
26.2%
920
min
initial
luminance
1000
cd
m–2.
ACS Energy Letters,
Journal Year:
2024,
Volume and Issue:
9(3), P. 1210 - 1218
Published: Feb. 26, 2024
Mixed
Br/Cl-perovskite
nanocrystals
(Pe-NCs)
CsPbBrxCl3–x,
synthesized
at
room
temperature
(RT),
offer
several
advantages
for
use
in
light-emitting
diodes
(LEDs),
including
cost-effective
processing
and
a
narrow
luminescence
peak.
However,
achieving
efficient
pure
blue
LEDs
using
CsPbBrxCl3–x
NCs
has
been
proven
to
be
challenging
due
significant
number
of
chlorine
defects.
In
this
work,
we
propose
passivation
strategy
utilizing
hydrazine
cations
(Hz2+)
eliminate
defects
RT-synthesized
Pe-NCs.
Our
investigation
reveals
that
Hz2+
can
capture
the
isolated
anion
(Cl–)
form
Hz–Cl–Cs
bridge
on
Pe-NC
surface,
thereby
effectively
inhibiting
formation
vacancies.
This
approach
significantly
enhances
both
photoluminescence
efficiency
lifetime
Consequently,
fabricated
Hz2+-passivated
Pe-NCs
achieve
an
outstanding
external
quantum
(EQE)
7.82%
475
nm.
findings
highlight
effective
mitigates
Pe-NCs,
advancing
development
LEDs.
Advanced Materials,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 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.
Abstract
Quantum-confined
CsPbBr
3
perovskites
are
promising
blue
emitters
for
ultra-high-definition
displays,
but
their
soft
lattice
caused
by
highly
ionic
nature
has
a
limited
stability.
Here,
we
endow
nanoplatelets
(NPLs)
with
atomic
crystal-like
structural
rigidity
through
proper
surface
engineering,
using
strongly
bound
N-dodecylbenzene
sulfonic
acid
(DBSA).
A
stable,
rigid
crystal
structure,
as
well
uniform,
orderly-arranged
of
these
NPLs
is
achieved
optimizing
intermediate
reaction
stage,
switching
from
molecular
clusters
to
mono-octahedra,
while
interaction
DBSA
resulted
in
formation
Cs
x
O
monolayer
shell
capping
the
NPL
surface.
As
result,
both
and
optical
stability
enhanced
strong
covalent
bonding
DBSA,
which
inhibits
undesired
phase
transitions
decomposition
perovskite
potentially
ligand
desorption.
Moreover,
rather
small
amount
ligands
at
results
short
inter-NPL
spacing
closely-packed
films,
facilitates
efficient
charge
injection
transport.
Blue
photoluminescence
produced
bright
(nearly
unity
emission
quantum
yield)
peaks
457
nm
an
extremely
narrow
bandwidth
3.7
80
K,
electroluminescence
(peaked
460
nm)
also
reaches
record-narrow
value
15
room
temperature.
This
corresponds
CIE
coordinates
(0.141,
0.062),
meets
Rec.
2020
standards
displays.
Nano Letters,
Journal Year:
2024,
Volume and Issue:
24(15), P. 4571 - 4579
Published: April 2, 2024
Efficient
pure-red
emission
light-emitting
diodes
(LEDs)
are
essential
for
high-definition
displays,
yet
achieving
is
hindered
by
challenges
like
phase
segregation
and
spectral
instability
when
using
halide
mixing.
Additionally,
strongly
confined
quantum
dots
(QDs)
produced
through
traditional
hot-injection
methods
face
byproduct
contamination
due
to
poor
solubility
of
metal
salts
in
the
solvent
octadecene
(ODE)
at
low
temperatures.
Herein,
we
introduced
a
novel
method
benzene-series
electrostatic
potential
instead
ODE
prevent
PbI2
intermediates
promote
their
dissolution
into
[PbI3]−.
Increasing
methyl
groups
on
benzene
yields
precisely
sized
(4.4
±
0.1
nm)
CsPbI3
QDs
with
exceptional
properties:
narrow
630
nm
PL
peak
photoluminescence
yield
(PLQY)
97%.
Sequential
ligand
post-treatment
optimizes
optical
electrical
performance
QDs.
PeLEDs
based
optimized
achieve
EL
(CIE:
0.700,
0.290)
approaching
Rec.
2020
standards,
an
EQE
25.2%
T50
120
min
initial
luminance
107
cd/m2.
Advanced Materials,
Journal Year:
2024,
Volume and Issue:
36(29)
Published: May 6, 2024
Abstract
The
power
conversion
efficiencies
(PCEs)
of
polycrystalline
perovskite
(PVK)
solar
cells
(SCs)
(PC‐PeSCs)
have
rapidly
increased.
However,
PC‐PeSCs
are
intrinsically
unstable
without
encapsulation,
and
their
efficiency
drops
during
large‐scale
production;
these
problems
hinder
the
commercial
viability
PeSCs.
Stability
can
be
increased
by
using
colloidal
PVK
nanocrystals
(c‐PeNCs),
which
high
surface
strains,
low
defect
density,
exceptional
crystal
quality.
use
c‐PeNCs
separates
crystallization
process
from
film
formation
process,
is
preponderant
in
fabrication.
Consequently,
has
substantial
potential
to
overcome
challenges
encountered
when
fabricating
PC‐PeSCs.
Research
on
nanocrystal‐based
SCs
(NC‐PeSCs)
PCEs
a
level
greater
than
those
other
quantum‐dot
SCs,
but
not
reached
PC‐PeSCs;
this
inferiority
significantly
impedes
widespread
application
NC‐PeSCs.
This
review
first
introduces
distinctive
properties
c‐PeNCs,
then
strategies
that
been
used
achieve
high‐efficiency
Then
it
discusses
detail
persisting
domain.
Specifically,
major
solutions
for
NC‐PeSCs
related
short‐circuit
current
density
J
sc
covered.
Last,
article
presents
perspective
future
research
directions
applications
realm
