Advanced Optical Materials,
Journal Year:
2024,
Volume and Issue:
12(21)
Published: May 31, 2024
Abstract
Recently,
the
potential
circularly
polarized
luminescence
(CPL)
property
of
chiral
2D
organic–inorganic
hybrid
perovskites
has
garnered
attention
due
to
their
strong
stability.
However,
photoluminescence
(PL)
intensity
perovskite
is
generally
low,
which
undoubtedly
limits
its
development.
Therefore,
improving
PL
and
CPL
become
an
important
focal
point.
To
overcome
this
problem,
a
series
Mn
2+
‐doped
R/S‐(MPEA)
2
PbBr
4
thin
films
successfully
synthesized.
The
can
produce
orange
emission
under
UV
excitation
with
highest
quantum
yield
(PLQY)
37.37%,
high
value
among
reported
perovskites.
Moreover,
all
Mn:
(R/S‐MPEA)
show
symmetric
signals.
flexible
regulation
meaningful
for
applications,
lacking
in
current
studies.
Here,
it
found
that
strength
be
effectively
regulated
by
doping
guanidine
(Gua),
maximum
g
lum
1.4
×
10
−2
PLQY
51.31%
achieved,
are
This
work
provides
new
idea
development
CPL‐active
materials
lays
foundation
spin
devices
based
on
perovskite.
Journal of the American Chemical Society,
Journal Year:
2024,
Volume and Issue:
146(20), P. 14157 - 14165
Published: May 10, 2024
Introducing
molecular
chirality
into
perovskite
crystal
structures
has
enabled
the
control
of
carrier
spin
states,
giving
rise
to
circularly
polarized
luminescence
(CPL)
in
thin
films
and
electroluminescence
(CPEL)
LEDs.
Spin-LEDs
can
be
fabricated
either
through
a
spin-filtering
layer
by
chiral-induced
selectivity
or
chiral
emissive
layer.
The
former
requires
high
degree
polarization
compatible
spinterface
for
efficient
injection,
which
might
not
easily
integrated
Alternatively,
also
generate
electroluminescence,
but
efficiency
remains
low
fundamental
mechanism
is
elusive.
In
this
work,
we
report
an
green
LED
based
on
quasi-two-dimensional
(quasi-2D)
perovskites
as
emitting
(EML),
where
CPEL
directly
produced
without
separate
injection.
optimized
exhibited
strong
CPL
at
535
nm
with
photoluminescence
quantum
yield
(PLQY)
91%
dissymmetry
factor
(glum)
8.6
×
10–2.
Efficient
spin-LEDs
were
successfully
demonstrated,
large
EL
(gEL)
7.8
10–2
maximum
external
(EQE)
13.5%
room
temperature.
Ultrafast
transient
absorption
(TA)
spectroscopic
study
shows
that
generated
from
rapid
energy
transfer
accompanied
2D
3D
perovskites.
Our
only
demonstrates
reliable
approach
achieve
performance
reveals
ACS Energy Letters,
Journal Year:
2025,
Volume and Issue:
unknown, P. 815 - 821
Published: Jan. 15, 2025
Spin-polarized
light-emitting
diodes
(spin-LEDs)
hold
promise
for
next-generation
technologies
across
optical
communication,
biological
imaging,
and
quantum
information
processing.
Chiral
metal
halide
perovskites,
which
combine
advantageous
optoelectronic
properties
with
chirality,
are
promising
materials
high-performance
spin-LEDs.
However,
such
spin-LEDs
still
suffer
from
low
efficiency
limited
brightness,
as
they
often
rely
on
low-dimensional
chiral
perovskites
rather
inferior
charge-transport
spin
filter
layers.
Herein,
we
demonstrate
bright
efficient
green
based
perovskite
nanocrystals
emitters.
We
employed
an
in
situ
ligand
modification
using
R-/S-1-(4-bromophenyl)-ethylammonium
bromide
to
imprint
chirality
onto
CsPbBr3
nanocrystals,
exhibited
both
a
high
photoluminescence
yield
of
89%
improved
relaxation
lifetime.
A
remarkable
spin-polarization
88%
was
observed
the
nanocrystal
films.
Consequently,
our
without
commonly
used
layer
simultaneously
achieved
maximum
brightness
12,800
cd
m–2,
record-high
peak
external
15.4%,
circularly
polarized
electroluminescence
dissymmetry
factor
2.16
×
10–3
at
room
temperature,
setting
new
benchmarks
perovskite-based
Nano Letters,
Journal Year:
2024,
Volume and Issue:
24(20), P. 6084 - 6091
Published: May 8, 2024
Chiral
perovskites
play
a
pivotal
role
in
spintronics
and
optoelectronic
systems
attributed
to
their
chiral-induced
spin
selectivity
(CISS)
effect.
Specifically,
they
allow
for
spin-polarized
charge
transport
light-emitting
diodes
(LEDs),
yielding
circularly
polarized
electroluminescence
at
room
temperature
without
external
magnetic
fields.
However,
chiral
lead
bromide-based
have
yet
achieve
high-performance
green
emissive
spin-LEDs,
owing
limited
CISS
effects
transport.
Herein,
we
employ
dimensional
regulation
Sn2+-doping
optimize
perovskite
architecture
spin-LEDs.
The
optimized
(PEA)x(S/R-PRDA)2–xSn0.1Pb0.9Br4
film
exhibits
an
enhanced
effect,
higher
hole
mobility,
better
energy
level
alignment
with
the
layer.
These
improvements
us
fabricate
spin-LEDs
quantum
efficiency
(EQE)
of
5.7%
asymmetry
factor
|gCP-EL|
1.1
×
10–3.
This
work
highlights
importance
tailored
architectures
doping
strategies
advancing
applications.
Materials Horizons,
Journal Year:
2024,
Volume and Issue:
11(12), P. 2906 - 2913
Published: Jan. 1, 2024
We
developed
new
quasi-2D
perovskites
with
chiral
and
achiral
organic
cations
as
co-ligands
demonstrated
their
effective
application
in
spin-LEDs
at
room
temperature
based
on
the
chiral-induced
spin
selectivity
(CISS)
effect.
Advanced Materials,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 29, 2025
Abstract
Spin
light‐emitting
diodes
(spin‐LEDs)
are
important
for
spin‐based
electronic
circuits
as
they
convert
the
carrier
spin
information
to
optical
polarization.
Recently,
chiral‐induced
selectivity
(CISS)
has
emerged
a
new
paradigm
enable
spin‐LED
it
does
not
require
any
magnetic
components
and
operates
at
room
temperature.
However,
CISS‐enabled
with
tunable
wavelengths
ranging
from
red
near‐infrared
(NIR)
yet
be
demonstrated.
Here,
chiral
quasi‐2D
perovskites
developed
fabricate
efficient
spin‐LEDs
NIR
region
by
tuning
halide
composition.
The
optimized
perovskite
films
exhibit
circularly
polarized
luminescence
675
788
nm,
photoluminescence
quantum
yield
(PLQY)
exceeding
86%
dissymmetry
factor
(
g
lum
)
8.5
×
10
−3
2.6
−2
.
More
importantly,
direct
electroluminescence
(CPEL)
is
achieved
temperature
in
spin‐LEDs.
This
work
demonstrated
highest
external
efficiency
(EQE)
reaching
12.4%
(EL)
factors
EL
3.7
1.48
composition‐dependent
CPEL
performance
further
attributed
prolonged
lifetime
revealed
ultrafast
transient
absorption
spectroscopy.
Nature Communications,
Journal Year:
2025,
Volume and Issue:
16(1)
Published: March 5, 2025
Realizing
high
electroluminescence
dissymmetric
factor
and
external
quantum
efficiency
at
the
same
time
is
challenging
in
light-emitting
diodes
with
direct
circularly
polarized
emission.
Here,
we
show
that
can
be
simultaneously
achieved
based
on
chiral
perovskite
dots.
Specifically,
dots
chiral-induced
spin
selectivity
concurrently
serve
as
localized
radiative
recombination
centers
of
spin-polarized
carriers
for
emission,
thereby
suppressing
relaxation
spins,
Meanwhile,
improving
ligand
exchange
found
to
synergistically
promote
their
optoelectronic
properties
so
chiroptoelectronic
performance
resulting
devices
facilitated.
Our
device
exhibits
(R:
0.285
S:
0.251)
16.8%
16%),
demonstrating
potential
constructing
high-performance
light
sources.
Advanced Functional Materials,
Journal Year:
2025,
Volume and Issue:
unknown
Published: March 3, 2025
Abstract
In
chiral
hybrid
perovskites
(CHPs),
the
generation
of
polarized
spin
current
and
manipulation
exciton
recombination
are
expected
to
produce
circularly
electroluminescence
(CP‐EL)
through
chiral‐induced
selectivity
(CISS).
It
opens
a
new
avenue
for
developing
single
junction
light‐emitting
diodes
(spin‐LEDs).
The
recent
challenge
lies
primarily
in
balancing
device
performance
CP‐EL
polarization.
Beyond
this,
blue
spin‐LEDs
have
not
been
fully
realized.
lacks
studies
interior
spin‐chiroptical
properties.
Herein,
promising
chirality
transfer
methodology
is
initiated
fabricating
sky‐blue
(≈491
nm)
using
synthesized
ionic
liquids
(CILs).
They
on
one
side
yield
material
passivation,
giving
rise
chiroptical
(EL)
An
optimal
external
quantum
efficiency
(EQE)
13.0%
with
dissymmetry
factor
0.158
obtained.
Importantly,
this
method
leads
elevation
orbit
coupling
(CISOC)
strength
up
0.9717
eV
A,
long
decay
lifetime
over
1
ns
A
large
approximately
75%
achieved
ambient
conditions.
This
work
unlocks
spin‐LEDs,
further
construction
spin‐chiroptics
relationship.
Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Aug. 7, 2024
Abstract
This
study
presents
the
development
of
mixed‐ligand
quasi‐2D
perovskites
((2‐PEA)
x
(
R/S
‐2‐BA)
2
MA
1
Cs
Pb
3
Br
10+
,
=
0.8,
1.6,
2.4)
for
circularly
polarized
light‐emitting
diodes
(CP‐LEDs).
By
utilizing
strong
confinement
effect
2‐phenylethylammonium
(2‐PEA)
and
chirality
R
/
S
‐2‐butylammonium
‐2‐BA),
room‐temperature
luminescence
(CPL)
across
green
to
deep
blue
spectrum
is
achieved.
The
CPL
attributes
transfer
spin‐polarized
excitons
while
originates
from
direct
excitation
luminescent
phases
with
intrinsic
chirality.
Finally,
CP‐LEDs
under
ambient
are
realized.
Notably,
standard
CP‐EL
achieved
based
on
0.8PEA/(
‐2‐BA)‐
1.2PEA/(
‐2‐BA)‐films
impressive
electroluminescent
asymmetry
factors
(0.122
0.175),
highlighting
potential
chiral
in
opening
avenues
full‐color
display.
Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Oct. 21, 2024
Abstract
Low
temperature
solution‐processible
chiral
metal
halide
perovskites,
which
posse
the
innately
chiral‐induced
spin
orbit
coupling
(CISOC),
are
valuable
for
realization
of
room
single
junctions‐based
spin‐light‐emitting
diodes
(spin‐LEDs),
without
involving
integrated
optics
and
ferromagnetic
electrodes.
The
current
challenging
primarily
lies
on
development
high‐performance
spin‐LEDs
demonstration
selectivity
(CISS).
Herein,
organic
cation
based
quasi‐2D
perovskite
films
with
prominently
circularly
polarized
luminescence
bright
emissions
fabricated
application
room‐temperature
spin‐LEDs.
A
remarkable
external
quantum
efficiency
(EQE)
15.42%
electroluminescence
(CP‐EL)
4.98%
well
achieved
in
ambient
condition.
With
studies
spin‐related
exciton
states
magneto‐photoluminescence
(magneto‐PL),
spin‐lifetime
(τ
s
)
is
estimated
to
be
20
ps.
This
work
has
greatly
promoted
present
growth
perovskites
