Nature Communications,
Год журнала:
2019,
Номер
10(1)
Опубликована: Окт. 17, 2019
Abstract
Two-dimensional
molecular
crystals,
consisting
of
zero-dimensional
molecules,
are
very
appealing
due
to
their
novel
physical
properties.
However,
they
mostly
limited
organic
molecules.
The
synthesis
inorganic
version
two-dimensional
crystals
is
still
a
challenge
the
difficulties
in
controlling
crystal
phase
and
growth
plane.
Here,
we
design
passivator-assisted
vapor
deposition
method
for
Sb
2
O
3
as
thin
monolayer.
passivator
can
prevent
heterophase
nucleation
suppress
low-energy
planes,
enable
molecule-by-molecule
lateral
along
high-energy
planes.
Using
Raman
spectroscopy
situ
transmission
electron
microscopy,
show
that
insulating
α-phase
flakes
be
transformed
into
semiconducting
β-phase
under
heat
electron-beam
irradiation.
Our
findings
extended
controlled
other
open
up
opportunities
potential
electronic
devices.
The Journal of Physical Chemistry Letters,
Год журнала:
2018,
Номер
9(18), С. 5490 - 5495
Опубликована: Сен. 5, 2018
Zero-dimensional
(0D)
perovskites
have
recently
opened
a
new
frontier
in
device
engineering
for
light
conversion
technologies
due
to
their
unprecedented
high
photoluminescence
quantum
yield
as
solids.
Although
many
experimental
and
theoretical
efforts
been
made
understand
optical
behavior,
the
origin
of
green
emission
is
still
opaque.
Here,
we
develop
complete
picture
point
defects
Cs-Pb-Br
demonstrate
that
bromide
vacancies
(VBr)
prototype
0D
perovskite
Cs4PbBr6
low
formation
energy
relevant
defect
level
contribute
midgap
radiative
state.
Moreover,
state-of-the-art
characterizations
including
atomic-resolution
electron
imaging
not
only
confirm
purity
phase
Br-deficient
green-emissive
nanocrystals
(NCs)
but
also
exclude
presence
CsPbBr3
NCs
impurities.
Our
findings
provide
robust
evidence
defect-induced
luminescence
NCs,
which
helps
extend
scope
utility
these
bulk
materials
optoelectronic
applications.
The Journal of Physical Chemistry Letters,
Год журнала:
2018,
Номер
9(14), С. 4131 - 4138
Опубликована: Июнь 28, 2018
To
break
free
of
the
limitations
imposed
by
three-dimensional
(3D)
perovskites,
such
as
their
lackluster
stability,
researchers
have
opened
new
frontiers
into
lower-dimensional
perovskite
derivatives.
Thanks
to
advances
in
solvent-based
synthesis
methods,
zero-dimensional
(0D)
inorganic
mainly
Cs4PbBr6,
recently
reemerged
various
forms
(from
single
crystals
nanocrystals)
materials
with
properties
that
bridge
organic
molecules
and
semiconductors.
These
include
intrinsic
Pb2+
ion
emission,
large
exciton
binding
energy,
small
polaron
formation
upon
photoexcitation,
addition
anomalous
green
photoluminescence
improved
stability
high
quantum
yield.
Moreover,
demonstration
Cs4PbBr6-based
light-emitting
diode
(LED)
devices
highlights
accelerating
efforts
toward
applications
motivates
further
investigations
these
emerging
materials.
This
Perspective
summarizes
progress
field
Cs4PbBr6
focusing
on
molecular-electronic
hotly
debated
photoluminescence.
We
conclude
presenting
implications
unique
findings
suggesting
opportunities
for
future
development
0D
perovskites.
Advanced Optical Materials,
Год журнала:
2020,
Номер
8(8)
Опубликована: Фев. 11, 2020
Abstract
Lead‐free
0D
metal
halide
perovskites
are
emerging
environmentally
friendly
materials
exhibiting
large
exciton
binding
energy,
which
have
recently
attracted
great
attention
for
their
excellent
light
emission
properties
and
favorable
stability.
Herein,
solvent
evaporation
crystallization
at
room
temperature
is
adopted
to
fabricate
Cs
3
Cu
2
I
5
perovskite
millimeter‐sized
crystals,
show
strong
blue
photoluminescence
(PL)
with
quantum
yield
of
up
89%,
a
Stockes
shift
long
(microsecond)
PL
lifetime,
originating
from
self‐trapped
excitons.
UV
pumped
light‐emitting
diodes
demonstrated
by
using
powder
as
solid‐state
phosphor,
the
precursor
solution
these
crystals
used
fluorescent
ink.
Furthermore,
blue‐emitting
composite
/polyvinylidene
fluoride
films
produced
spin
coating
through
followed
patterning
direct
laser
writing
technology,
potentially
useful
displays.
Finally,
method
expanded
yellow
emissive
CsCu
changing
chemical
molar
ratio
precursor.
Chemistry of Materials,
Год журнала:
2019,
Номер
31(21), С. 9003 - 9011
Опубликована: Окт. 14, 2019
Inorganic
metal
halide
perovskite
nanocrystals
(NCs)
are
promising
materials
for
emission-based
applications;
however,
the
inclusion
of
toxic
lead
may
limit
their
commercial
viability.
This
paper
describes
two
cesium
cupriferous
iodides
as
nontoxic
alternatives
to
containing
perovskites.
These
were
synthesized
with
tailored
composition
and
morphology
by
a
hot-injection
colloidal
route
produce
hexagonal
nanoplates
(NPs)
blue-emitting
Cs3Cu2I5
nanorods
(NRs)
yellow-emitting
CsCu2I3.
Phase
purity
was
confirmed
Rietveld
refinement
X-ray
powder
diffraction
patterns
solid
state
133Cs
MAS
NMR
both
compounds
exhibiting
high
thermal
stability
suitable
optoelectronic
technologies.
mixing
allows
linear
tuning
Commission
Internationale
de
l'Eclairage
(CIE)
coordinates
from
(0.145,
0.055)
(0.418,
0.541)
such
that
1:8
molar
ratio
NPs
CsCu2I3
NRs
yields
white
emission,
while
demonstrates
these
photophysical
effects
not
attributed
any
changes
in
Cu
oxidation
state.
Nature Communications,
Год журнала:
2019,
Номер
10(1)
Опубликована: Окт. 17, 2019
Abstract
Two-dimensional
molecular
crystals,
consisting
of
zero-dimensional
molecules,
are
very
appealing
due
to
their
novel
physical
properties.
However,
they
mostly
limited
organic
molecules.
The
synthesis
inorganic
version
two-dimensional
crystals
is
still
a
challenge
the
difficulties
in
controlling
crystal
phase
and
growth
plane.
Here,
we
design
passivator-assisted
vapor
deposition
method
for
Sb
2
O
3
as
thin
monolayer.
passivator
can
prevent
heterophase
nucleation
suppress
low-energy
planes,
enable
molecule-by-molecule
lateral
along
high-energy
planes.
Using
Raman
spectroscopy
situ
transmission
electron
microscopy,
show
that
insulating
α-phase
flakes
be
transformed
into
semiconducting
β-phase
under
heat
electron-beam
irradiation.
Our
findings
extended
controlled
other
open
up
opportunities
potential
electronic
devices.
