Fabrication of blue-emitting CH3NH3PbBr3 nanocrystals: Effects of dipole moment and oxygen functional groups in precipitation solvents on the crystal growth and optical properties of CH3NH3PbBr3 nanocrystals
Journal of Colloid and Interface Science,
Год журнала:
2025,
Номер
unknown, С. 137530 - 137530
Опубликована: Апрель 1, 2025
Язык: Английский
Sb3+-Doped Rb2HfCl6 Perovskites as High-Performance Thermally Stable Single-Component Phosphors for White Light-Emitting Diodes
Materials,
Год журнала:
2025,
Номер
18(9), С. 1896 - 1896
Опубликована: Апрель 22, 2025
Stable
and
efficient
inorganic
lead-free
double
perovskites
are
crucial
for
high-reliability
optoelectronic
devices.
However,
dual-doped
perovskite
phosphors
often
suffer
from
poor
color
stability
due
to
differences
in
thermal
activation
energies
electron–phonon
interactions
between
the
doped
ions.
To
address
this,
single-doped
Sb3+-incorporated
Rb2HfCl6
crystals
were
synthesized
via
a
co-precipitation
method.
Under
UV
excitation,
Rb2HfCl6:Sb
exhibits
broad
dual
emission
bands,
attributed
singlet
triplet
self-trapped
exciton
radiative
transitions
induced
by
Jahn–Teller
distortion
[SbCl6]3−
octahedra.
This
endows
material
with
high
sensitivity
excitation
wavelengths,
enabling
tunable
luminescence
cyan
orange-red
across
400–800
nm.
Utilizing
this
emission,
white
LED
was
fabricated,
showcasing
rendering
index
excellent
long-term
stability.
Remarkably,
breakthrough
stability,
maintaining
more
than
90%
of
its
intensity
at
100
°C,
while
also
exhibiting
remarkable
resistance
humidity
oxygen
exposure.
Compared
co-doped
phosphors,
offers
advantages
such
as
environmental
friendliness,
simple
fabrication,
stable
performance,
making
it
an
ideal
candidate
WLEDs.
study
demonstrates
notable
progress
developing
thermally
reliable
Язык: Английский
Efficient Rec. 2020 Compliant Pure‐Green Mixed‐Cation Perovskite Light‐Emitting Diodes With Multifunctional Co‐Additives
Advanced Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Май 13, 2025
Abstract
Perovskite
light‐emitting
diodes
(PeLEDs)
compliant
with
Rec.
2020
standards
have
raised
increasing
attention
for
next‐generation
displays.
As
a
class
of
pure‐green
emitters,
the
mixed‐cation
FA
x
Cs
1‐x
PbBr
3
perovskites
exhibit
compatible
band
emission,
but
suffer
from
inferior
luminescence
performance.
The
approach
to
tackling
this
issue
is
hindered
by
lack
in‐depth
understanding
their
crystallization
manipulating
mechanism.
This
work
unveils
process
0.7
0.45
GA
0.1
perovskites,
demonstrating
fast
spontaneous
growth
readily
induces
severe
crystal
defects
accompanied
poor
charge
confinement.
motivates
us
introduce
additional
kinetic
barriers
manipulate
perovskite
via
synergistic
co‐additives
3‐((2‐(methacryloyloxy)ethyldimethyl)ammonio)‐propane‐1‐sulfonate
(DMAPS)
and
1,4,7,10,13,16‐hexaoxacyclooctadecane
(crown).
multifunctional
groups
in
afford
robust
chemical
affinities
diverse
organic
inorganic
precursor
ions
simultaneously,
which
enable
decent
nanograin
effective
defect
healing
Ultimately,
high
photoluminescence
quantum
yield
96%
are
achieved.
resultant
PeLEDs
compliance
champion
external
efficiency
(EQE)
31.89%,
average
EQE
29.5%,
maximum
luminance
2
×
10
5
cd
m
−2
operational
half‐lifetime
3.2
h
at
an
initial
7000
(extrapolated:
≈3500
100
).
Язык: Английский
Ag Doping Triggered Electronic Structural Engineering in Halide Quadruple Perovskite Toward Near‐Unity Luminescence Quantum Yield
Laser & Photonics Review,
Год журнала:
2025,
Номер
unknown
Опубликована: Май 19, 2025
Abstract
Ion
doping
is
an
effective
strategy
to
regulate
the
optical
performance
in
metal
halide
perovskites
for
desirable
light
emission
manipulations.
In
this
work,
a
Mn
2+
and
Ag
+
co‐doping
utilized
improve
luminescence
Cs
4
CdBi
2
Cl
12
quadruple
perovskite.
ions
are
proven
be
incorporated
into
lattice.
occupy
Cd
sites
or
vacancies.
The
alloyed
bring
efficient
orange‐red
attributed
energy
transfer
process
from
host
ions.
A
small
amount
of
can
optimize
band
structure
increase
exciton
binding
energy,
thus
promoting
radiative
recombination
d–d
transition
boosting
PLQY
up
94.6%.
Furthermore,
0.75
0.25
Bi
:1.5%Ag
show
good
phase
stability
ambient
environment
employed
white
light‐emitting
diodes
with
commercial
blue
green
phosphors
on
near‐ultraviolet
LED
chip.
This
work
provides
insights
understanding
composition‐structure‐property
relationship
vacancy‐ordered
designing
highly
luminescent
lead‐free
halides
solid‐state
emitting
applications.
Язык: Английский
Development of Eu2+‐Doped UCr4C4‐Type Phosphors Toward Advanced Display Applications
Laser & Photonics Review,
Год журнала:
2025,
Номер
unknown
Опубликована: Июнь 2, 2025
Abstract
Display
technology
is
an
indispensable
cornerstone
of
the
modern
information
era,
where
phosphors
have
been
playing
important
role
in
display
application.
Eu
2+
‐doped
UCr
4
C
‐type
are
transformative
materials
for
next‐generation
displays,
offering
narrow
emission
bands,
high
quantum
efficiency,
and
thermal
stability.
Their
rigid
crystal
structure,
derived
from
mineral
framework,
optimizes
2
⁺
luminescence.
Over
past
decade,
substantial
advancements
achieved
developing
nitride,
oxide,
oxynitride
variants
with
tunable
emissions
across
visible
spectrum.
Solid‐solution
approaches
enable
precise
spectral
control
to
meet
diverse
application
demands.
However,
poor
moisture
resistance
limits
practical
use
due
rapid
degradation
humid
conditions.
Encapsulation
methods,
including
hydrophobic
coatings,
inorganic
layers,
hybrid
“Soft
+
Hard”
systems,
along
intrinsic
material
modifications
(composition
substitution)
explored
enhance
stability
without
compromising
luminescent
performance.
These
show
exceptional
potential
high‐resolution,
low‐power,
high‐brightness
displays.
This
review
summarizes
their
development,
structural
characteristics,
spectral‐tuning
strategies,
moisture‐resistance
improvements,
applications,
while
outlining
future
research
directions
bridge
fundamental
studies
implementation
advanced
technologies.
Язык: Английский