ACS Energy Letters,
Journal Year:
2024,
Volume and Issue:
9(3), P. 1125 - 1132
Published: Feb. 22, 2024
High-performance
pure-red
perovskite
light-emitting
diodes
(PeLEDs)
with
luminescence
peaks
around
630
nm
are
desirable
for
displays,
yet
the
brightness
and
operational
stability
remain
critical
factors
limiting
their
applications.
Here,
we
report
high-luminance
long-life
PeLEDs
achieved
by
4-fluorobenzenesulfonamide
(4-FBSA)
anchored
CsPb(Br/I)3
nanocrystals
(NCs).
Theoretical
simulation
experimental
results
confirm
p-π
conjugated
moiety,
electronegative
atoms
weaken
capability
of
nitrogen
to
accept
foreign
protons,
allowing
4-FBSA
act
as
an
L-type
ligand
under
acid-amine
circumstance
strongly
coordinate
NC
surface.
The
firmly
bonded
not
only
passivates
surface
defects
but
also
enhances
NCs.
resultant
device
exhibits
a
remarkable
luminance
21
590
cd
m–2,
peak
efficiency
21.8%,
extended
half-lifetime
11.7
h
negligible
spectral
shifting
broadening
during
operation,
signifying
advancement
Rec.2020
mix-halide
emitters
toward
display
Nano Letters,
Journal Year:
2024,
Volume and Issue:
24(12), P. 3719 - 3726
Published: March 14, 2024
Mixed-halide
CsPb(Br/I)3
perovskite
quantum
dots
(QDs)
are
regarded
as
one
of
the
most
promising
candidates
for
pure-red
light-emitting
diodes
(PeLEDs)
due
to
their
precise
spectral
tuning
property.
However,
lead-rich
surface
these
QDs
usually
results
in
halide
ion
migration
and
nonradiative
recombination
loss,
which
remains
a
great
challenge
high-performance
PeLEDs.
To
solve
above
issues,
we
employ
chelating
agent
1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic
acid
hydrate
(DOTA)
polish
meanwhile
introduce
new
ligand
2,3-dimercaptosuccinic
(DMSA)
passivate
defects
QDs.
This
synchronous
post-treatment
strategy
high-quality
with
suppressed
an
improved
photoluminescence
yield,
enables
us
fabricate
spectrally
stable
PeLEDs
peak
external
efficiency
23.2%,
representing
best
performance
based
on
mixed-halide
reported
date.
Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
34(13)
Published: Feb. 16, 2024
Abstract
To
elevate
the
performance
and
durability
of
perovskite
solar
cells,
a
holistic
approach
to
mitigating
defects
throughout
device
is
essential.
While
advancements
in
refining
top
interfaces
have
been
significant,
potential
stabilizing
buried
grain
boundaries
has
not
fully
tapped.
The
research
underscores
transformative
impact
guanidine
phosphate
(GP),
chemical
agent
that
converts
surplus
PbI
2
into
low‐dimensional
perovskite,
thus
reinforcing
stability
both
boundaries.
Employing
GP
on
quantum
dot
tin
dioxide
(QD‐SnO
)
surfaces
revealed
an
exceptional
wrapping
effect
at
these
critical
junctures,
as
by
high‐resolution
transmission
electron
microscopy.
This
novel
enveloping
strategy
only
passivates
but
also
delays
cooling
hot
carriers,
thereby
diminishing
charge
carrier
recombination.
exhibits
enhanced
power
conversion
efficiency,
rising
from
23.16%
24.55%.
Moreover,
modified
sustains
over
90%
their
initial
efficiency
after
1000
h
maximum
point
tracking
under
one
sun
illumination
maintain
1400
moderate
humidity,
all
achieved
without
encapsulation.
breakthrough
points
robust
method
for
augmenting
cell,
promising
more
durable,
efficient
energy.
ACS Energy Letters,
Journal Year:
2024,
Volume and Issue:
9(3), P. 1125 - 1132
Published: Feb. 22, 2024
High-performance
pure-red
perovskite
light-emitting
diodes
(PeLEDs)
with
luminescence
peaks
around
630
nm
are
desirable
for
displays,
yet
the
brightness
and
operational
stability
remain
critical
factors
limiting
their
applications.
Here,
we
report
high-luminance
long-life
PeLEDs
achieved
by
4-fluorobenzenesulfonamide
(4-FBSA)
anchored
CsPb(Br/I)3
nanocrystals
(NCs).
Theoretical
simulation
experimental
results
confirm
p-π
conjugated
moiety,
electronegative
atoms
weaken
capability
of
nitrogen
to
accept
foreign
protons,
allowing
4-FBSA
act
as
an
L-type
ligand
under
acid-amine
circumstance
strongly
coordinate
NC
surface.
The
firmly
bonded
not
only
passivates
surface
defects
but
also
enhances
NCs.
resultant
device
exhibits
a
remarkable
luminance
21
590
cd
m–2,
peak
efficiency
21.8%,
extended
half-lifetime
11.7
h
negligible
spectral
shifting
broadening
during
operation,
signifying
advancement
Rec.2020
mix-halide
emitters
toward
display
