ACS Applied Nano Materials,
Journal Year:
2023,
Volume and Issue:
6(16), P. 15247 - 15254
Published: Aug. 14, 2023
Lead-free
double-perovskite
nanocrystals
(NCs)
have
emerged
as
a
promising
material
to
address
the
issues
of
instability
and
toxicity
associated
with
lead-based
materials.
Metal
ion
doping
or
alloying
strategies
been
widely
used
tailor
optimize
optical
electrical
properties
semiconductor
In
this
study,
we
prepared
monodisperse
Cs2AgBiBr6
NCs
uniform
morphology
(8
±
1
nm)
excellent
crystallinity
using
thermal
injection
method.
Compared
photoluminescence
quantum
yield
(PLQY)
(∼0.4%),
highest
PLQY
Cs2Ag0.64K0.36BiBr6
reached
6.82%,
an
extended
exciton
lifetime
from
2.08
10.64
ns,
which
is
approximately
5.1
times
longer.
The
binding
energy
(Eb)
longitudinal
phonon
(ℏωop)
were
measured
be
197.9
31.7
meV,
respectively.
For
NCs,
values
Eb
ℏωop
determined
317.6
53.1
These
results
indicate
that
nonradiative
recombination
in
weaker
compared
resulting
improved
PLQY.
K+-alloyed
exhibit
potential
for
application
light-emitting
diodes.
The Journal of Chemical Physics,
Journal Year:
2025,
Volume and Issue:
162(16)
Published: April 22, 2025
All-inorganic
halide
double
perovskites
have
attracted
extensive
attention
as
new
luminescent
materials
owing
to
their
high
luminous
efficiency
and
wide
emission
spectrum.
In
this
work,
blue-red
bicolor
Cs2NaGdCl6
(CNGC)
perovskite
nanocrystals
doped
with
Sb3+/Ho3+
were
prepared
using
a
hydrothermal
method.
The
incorporation
of
Sb3+
significantly
enhanced
the
intrinsic
“self-trapped
excitons
(STEs)”
wide-band
bright
blue
centered
at
470
nm.
On
basis,
different
concentrations
Ho3+
introduced
achieve
color
tunable
from
red
region,
extremely
quantum
efficiencies
96.53%
92.17%,
respectively.
By
use
diverse
methods,
including
spectroscopic
analysis
fluorescence
lifetime,
mechanism
efficient
luminescence
related
dopant
was
comprehensively
explored.
Results
show
that
not
only
can
enhance
STEs
CNGC
but
also
has
an
activation
effect
on
rare
earth
ion
Ho3+,
because
it
plays
role
bridge
for
two
energy
transfer
channels
between
centers,
details
investigated.
Thermal
stabilities
studied
over
temperature
range
303–473
K
good
performances
demonstrated
fact
PL
intensities
CNGC:1%Sb3+
CNGC:1%Sb3+/10%Ho3+
423
75.1%
70.1%
compared
those
303
K,
With
CNGC:1%Sb3+/10Ho3+
used,
UV
light-emitting
diode
activated
devices
fabricated
characterized.
emissions
suggest
materials’
prominent
potential
in
application
plant
lighting.
Finally,
white-light
sole
matrix,
strategy
tri-doping
Tb3+
proposed
based
principle
three
primary
colors.
device
fabrication
CNGC:1%Sb3+/10%Ho3+/2.5%Tb3+
sample
characterization
processes
prove
its
feasibility
then
provide
valuable
insights
design
Sb
ion-doped
lead-free
toward
easily
which
be
applied
various
fields.
ACS Applied Nano Materials,
Journal Year:
2023,
Volume and Issue:
6(16), P. 15247 - 15254
Published: Aug. 14, 2023
Lead-free
double-perovskite
nanocrystals
(NCs)
have
emerged
as
a
promising
material
to
address
the
issues
of
instability
and
toxicity
associated
with
lead-based
materials.
Metal
ion
doping
or
alloying
strategies
been
widely
used
tailor
optimize
optical
electrical
properties
semiconductor
In
this
study,
we
prepared
monodisperse
Cs2AgBiBr6
NCs
uniform
morphology
(8
±
1
nm)
excellent
crystallinity
using
thermal
injection
method.
Compared
photoluminescence
quantum
yield
(PLQY)
(∼0.4%),
highest
PLQY
Cs2Ag0.64K0.36BiBr6
reached
6.82%,
an
extended
exciton
lifetime
from
2.08
10.64
ns,
which
is
approximately
5.1
times
longer.
The
binding
energy
(Eb)
longitudinal
phonon
(ℏωop)
were
measured
be
197.9
31.7
meV,
respectively.
For
NCs,
values
Eb
ℏωop
determined
317.6
53.1
These
results
indicate
that
nonradiative
recombination
in
weaker
compared
resulting
improved
PLQY.
K+-alloyed
exhibit
potential
for
application
light-emitting
diodes.
