Advanced Optical Materials,
Journal Year:
2024,
Volume and Issue:
12(13)
Published: Feb. 5, 2024
Abstract
In
next
generation
semiconductors,
metal
halide
perovskite
materials
would
replace
traditional
light‐emitting
since
their
exceptional
photoelectronic
characteristics.
The
future
development
of
diodes
have
generated
challenges
such
as
abundant
surface
or
interfacial
defects
and
exciton
quenching.
To
overcome
these
challenges,
the
layer
is
modified
utilizing
benzimidazole/phosphine
oxide
hybrid
1,3,5‐tris(1‐(4‐(diphenylphenylphosphoryl)phenyl)‐1H‐benzo[d]imidazol‐2‐yl)benzene
(TPOB)
1,3,5‐tris(diphenylphosphoryl)benzene
(TPO)
with
high
triple
energy
state.
It
demonstrated
by
X‐ray
photoelectron
spectroscopy
results
that
oxygen
atoms
in
P
=
O
functional
group
TPOB
TPO
provided
lone
electron
pairs
coordinate
to
unsaturated
Pb
2+
turn
led
a
decrease
cloud
density
Br‐,
which
can
suppress
defects.
Additionally,
this
technique
improved
morphology
film,
reduced
roughness,
facilitated
carrier
transport,
all
are
crucial
for
achieving
high‐emission
efficiency.
As
result,
optimal
devices
has
EQEs
16.20
20.48%
(TPO),
respectively.
Furthermore,
excellent
reproducibility.
Excitingly,
champion
EQE
value
device
22.64%.
Simultaneously,
it
increase
stability
lifetimes
increased
from
1231
s
(Pristine)
5421
5631
(TPO).
Advanced Science,
Journal Year:
2025,
Volume and Issue:
unknown
Published: March 9, 2025
The
evolution
of
display
technology
toward
ultrahigh
resolution,
high
color
purity,
and
cost-effectiveness
has
generated
interest
in
metal
halide
perovskites,
particularly
colloidal
perovskite
nanocrystals
(PeNCs).
PeNCs
exhibit
narrow
emission
spectra,
photoluminescence
quantum
yields,
wide
gamuts,
rendering
them
promising
candidates
for
next-generation
displays.
Despite
significant
advancements
light-emitting
diode
(PeLED)
technology,
challenges
remain
regarding
the
efficiencies
PeNC-based
blue
LEDs.
Addressing
these
challenges,
including
both
inherent
external
instabilities
operational
devices,
is
important
as
they
collectively
impede
broader
acceptance
utilization
PeNCs.
Herein,
a
comprehensive
overview
syntheses
dimension-
composition-controlled
critical
factors
influencing
performances
LEDs
provided.
Moreover,
associated
with
application
are
explored,
potentials
displays
emphasized.
This
review
highlights
path
forward
future
development
Advanced Materials,
Journal Year:
2025,
Volume and Issue:
unknown
Published: May 15, 2025
Abstract
The
development
of
ultrabroadband
light
sources
spanning
the
visible
(Vis)
to
near‐infrared
(NIR)
range
is
fundamental
importance
for
cutting‐edge
applications
in
communication,
metrology,
and
quantum
technologies.
Although
phosphor‐converted
LEDs
have
extended
emission,
they
still
suffer
from
spectral
gaps,
inadequate
color
rendering,
constrained
NIR
output.
Here,
a
promising
approach
introduced
by
tailoring
multi‐exciton
energy
transfer
pathways
realize
Vis‐to‐NIR
emission
Sb
3
⁺/Ln
⁺
co‐doped
vacancy‐ordered
Cs₂HfCl₆
perovskite
nanocrystals.
By
systematically
optimizing
Ln
doping
concentrations,
excitation
wavelengths,
lanthanide
ion
selection,
between
singlet
triplet
self‐trapped
exciton
(STE)
states
levels
are
modulated.
This
design
facilitates
broad
tunability
through
distribution
control
among
centers,
improves
radiative
efficiency
reducing
losses
during
processes,
promotes
stable
performance
mitigating
excessive
accumulation.
resulting
single‐component
LED
based
on
⁺/Pr
NCs
delivers
broadband
extending
≈1200
nm,
high
quality
(CRI
∼
98.1,
R9
98),
strong
visible/NIR
PLQY
(≈80%),
steady
operation
over
50
h.
findings
provide
insight
into
engineering
low‐dimensional
perovskites
offer
viable
route
toward
emerging
solid‐state
sources.
Coatings,
Journal Year:
2024,
Volume and Issue:
14(1), P. 83 - 83
Published: Jan. 7, 2024
Metal
halide
perovskites
have
shown
excellent
optoelectronic
properties,
including
high
photoluminescence
quantum
yield,
tunable
emission
wavelengths,
narrow
full-width
at
half-maximums
and
a
low-cost,
solution-processed
fabrication,
which
make
it
exhibit
great
potential
as
emission-layer
materials
of
light-emitting
diodes.
With
the
joint
efforts
researchers
from
different
disciplines,
there
has
been
significant
progress
in
improvement
external
efficiency
(EQE)
stability
perovskite
diodes
(PeLEDs)
recent
years,
especially
green
PeLEDs
with
EQEs
over
30%.
However,
their
operational
lags
behind
other
commercial
organic
chalcogenide
dot
emitters,
limiting
practical
application.
In
this
review,
we
first
introduce
basic
device
structure
PeLEDs,
well
factors
influencing
EQE
PeLEDs.
Secondly,
development
lead-based
lead-free
are
summarized
systematically.
Thirdly,
challenges
discussed
detail,
low
blue
poor
roll-off.
Finally,
some
suggestions
perspectives
for
future
research
directions
proposed.
Advanced Optical Materials,
Journal Year:
2024,
Volume and Issue:
12(13)
Published: Feb. 5, 2024
Abstract
In
next
generation
semiconductors,
metal
halide
perovskite
materials
would
replace
traditional
light‐emitting
since
their
exceptional
photoelectronic
characteristics.
The
future
development
of
diodes
have
generated
challenges
such
as
abundant
surface
or
interfacial
defects
and
exciton
quenching.
To
overcome
these
challenges,
the
layer
is
modified
utilizing
benzimidazole/phosphine
oxide
hybrid
1,3,5‐tris(1‐(4‐(diphenylphenylphosphoryl)phenyl)‐1H‐benzo[d]imidazol‐2‐yl)benzene
(TPOB)
1,3,5‐tris(diphenylphosphoryl)benzene
(TPO)
with
high
triple
energy
state.
It
demonstrated
by
X‐ray
photoelectron
spectroscopy
results
that
oxygen
atoms
in
P
=
O
functional
group
TPOB
TPO
provided
lone
electron
pairs
coordinate
to
unsaturated
Pb
2+
turn
led
a
decrease
cloud
density
Br‐,
which
can
suppress
defects.
Additionally,
this
technique
improved
morphology
film,
reduced
roughness,
facilitated
carrier
transport,
all
are
crucial
for
achieving
high‐emission
efficiency.
As
result,
optimal
devices
has
EQEs
16.20
20.48%
(TPO),
respectively.
Furthermore,
excellent
reproducibility.
Excitingly,
champion
EQE
value
device
22.64%.
Simultaneously,
it
increase
stability
lifetimes
increased
from
1231
s
(Pristine)
5421
5631
(TPO).
