The Journal of Physical Chemistry Letters,
Год журнала:
2024,
Номер
unknown, С. 12171 - 12180
Опубликована: Дек. 2, 2024
Near-infrared
(NIR)
spectroscopy
has
diverse
applications
across
various
fields,
such
as
the
detection
of
food
components
and
pesticide
residues,
early
diagnosis,
treatment
cancer.
In
this
work,
a
series
optimized
LiAl5–xGaxO8:0.1Ni2+
(x
=
0–5)
ultrabroadband
NIR-II
luminescent
systems
are
developed.
The
density
functional
theory
(DFT)
calculations,
time-resolved
photoluminescence
(TRPL)
spectroscopy,
77
K
PL
spectra
demonstrate
that
substitution
Ga3+
for
Al3+
creates
more
favorable
sites
Ni2+
luminescence
enhances
structural
orderliness
while
reducing
number
centers.
This
leads
to
red
shift
in
emission
peak
from
1177
1252
nm
with
14-fold
increase
intensity.
At
375
K,
thermal
stability
increases
81%
0)
90%
5)
compared
300
K.
Subsequent
co-doping
Cr3+
results
an
excitation
into
blue-violet
region
(420
nm),
accompanied
by
notable
enhancement
absorption
efficiency
(AE)
external
quantum
(EQE)
4%
62%.
Finally,
potential
application
prepared
phosphors
both
qualitative
quantitative
analysis
organic
compounds
is
demonstrated,
which
will
offer
new
insights
design
synthesis
light
sources.
Advanced Functional Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 10, 2025
Abstract
Tin
(Sn)‐based
perovskites
show
significant
potential
in
lead‐free
perovskite
optoelectronics.
Currently,
the
spin‐coating
method
combining
DMSO
co‐solvent
and
antisolvent‐dropping
has
been
adopted
to
produce
Sn‐based
films.
However,
intrinsically
oxidizes
Sn
2+
while
fast
causes
serious
coupling
between
crystal
nucleation
growth,
leading
easy
formation
of
defects
poor
stability
Herein,
hydrazine
acetate
(HAAc)
ionic
salt,
possessing
strong
coordination
ability
with
,
is
developed
stabilize
decouple
crystallization
by
promoting
pre‐formed
crystals
(PFCs)
precursor
solution
enabling
self‐assembly
PFCs
during
spin‐coating.
The
HA
x
FA
1‐x
SnI
3
films
fabricated
this
technique
tunable
bandgap,
low
defect
density,
oriented
crystals,
producing
optoelectronic
devices
decent
photovoltaic
electroluminescence
performance.
DMSO‐free
one‐step
film‐forming
enabled
HAAc‐assisted
decoupling
can
open
up
new
avenues
for
facile
low‐cost
manufacturing
efficient
stable
adopting
Advanced Materials Technologies,
Год журнала:
2025,
Номер
unknown
Опубликована: Апрель 9, 2025
Abstract
Lead‐free
double
perovskites
(LFDP)
have
attracted
considerable
attention
due
to
their
remarkable
optoelectronic
characteristics,
which
include
tunable
bandgaps
spanning
the
entire
visible
spectrum,
high
photoluminescence
quantum
yields
(PLQY),
and
wide
emission
bandwidths.
The
incorporation
of
transition
metal
ions
into
lead‐free
perovskites,
as
an
efficient
method
for
tailoring
optical
properties,
is
crucial
both
foundational
research
practical
applications
in
devices
such
light‐emitting
diodes
(LEDs),
anti‐counterfeiting,
temperature
sensors,
X‐ray
scintillators.
In
this
review,
recent
progress
design
ion‐doped
summarized,
briefly
introduce
strategies
effective
doping
several
representative
perovskites.
manipulation
properties
through
ion
doping,
focusing
on
enhanced
stability,
increased
luminescent
efficiency,
tuning
bands,
luminescence
lifetimes
are
highlighted.
conclusion,
challenges
perspectives
dynamic
area
addressed.
Crystals,
Год журнала:
2025,
Номер
15(5), С. 395 - 395
Опубликована: Апрель 24, 2025
The
current
work
determines
the
physical
properties
of
Cs2HfCl6
photovoltaic
compounds
including
their
structural,
electronic,
and
optical
behavior,
utilizing
DFT
approach.
simulated
lattice
constants,
cell
volumes,
bond
lengths
decrease
as
pressure
increases
from
0
to
20
GPa.
band
structure
analysis
reveals
that
calculated
under-pressure
(0–20
GPa)
is
semiconducting
with
a
flexible
indirect
bandgap
(5.44,
2.76,
2.02,
1.45,
0.99)
eV.
electronic
diminishes
GPa),
transitioning
compound
UV
visible
spectra.
This
alteration
improves
transition
VBM
CBM,
hence
augmenting
effectiveness.
Concurrently,
dielectric
function
escalates,
enhancing
absorption
conductivity,
causing
red
shift
in
spectra,
while
diminishing
reflection
Our
findings
on
hydraulic
electrical
indicate
may
be
utilized
development
next-generation
solar
cells,
LEDs,
sensors,
high-pressure
instruments.
Organic–inorganic
metal
halides
(OIMHs)
exhibiting
superior
optoelectronic
properties
have
shown
broad
applications
in
sensing,
photovoltaic
devices,
information
storage,
and
biological
imaging.
Compared
with
pure
inorganic
or
organic
materials,
OIMHs
are
distinguished
by
their
hybrid
feature,
processability
of
components
robustness
units,
as
well
plentiful
luminescent
sources
derived
from
ligands,
self‐trapped
excitons
(STEs)
lattices,
the
energy
transfer
between
species.
Thereinto,
chemical
composition
tunability
component,
ions,
halogen
provides
multiple
adjustable
sites
to
tailor
structures
physicochemical
properties.
However,
how
realizing
effective
tunable
luminescence
for
desired
through
rational
regulation
has
become
a
challenge.
In
this
review,
starting
structurally
OIMHs,
feasible
methods
regulating
summarized,
which
include
change
components,
dimensionality
configurations
species,
heterometal
systematic
multisite
fine‐tuning
based
on
specific
matrix.
Finally,
challenges
synthesize
promising
performance
discussed.
