Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Dec. 12, 2024
Abstract
Room
temperature
phosphorescence
(RTP)
materials
are
of
significant
attentions
due
to
their
unique
optical
properties
and
potential
applications
in
anti‐counterfeiting
information
security.
However,
single
spatial
resolution
decryption
methods
fail
meet
high‐level
security
demands.
A
novel
dual‐mode
encryption
strategy
based
on
self‐trapped
exciton
(STE)
fluorescence
is
proposed.
By
introducing
ns
2
metal
ions
into
the
zero‐dimensional
organic–inorganic
hybrid
halide
(Ph
3
S)
SnCl
6
,
energy
transfer
pathways
from
S
1
T
n
levels
STEs
constructed,
enabling
precise
control
performance.
This
material
exhibited
STE
fluorescence‐phosphorescence
with
different
afterglow
time,
which
can
be
utilized
develop
high‐performance
time‐resolved
cryptographic
systems.
Femtosecond
transient
absorption
experiments
indicated
that
rate
significantly
affected
characteristics
long
materials.
The
this
systems
demonstrated,
enhancing
through
multi‐level
providing
a
new
avenue
for
advanced
Angewandte Chemie International Edition,
Journal Year:
2024,
Volume and Issue:
64(1)
Published: Sept. 12, 2024
Exploring
structural
phase
transitions
and
luminescence
mechanisms
in
zero-dimensional
(0D)
metal
halides
poses
significant
challenges,
that
are
crucial
for
unlocking
the
full
potential
of
tunable
optical
properties
diversifying
their
functional
capabilities.
Herein,
we
have
designed
two
inter-transformable
0D
Cu(I)-based
halides,
namely
(C
The Journal of Physical Chemistry Letters,
Journal Year:
2025,
Volume and Issue:
16(2), P. 544 - 552
Published: Jan. 6, 2025
Lead-free
halide
double
perovskites
(DPs)
have
become
a
research
hotspot
in
the
field
of
photoelectrons
due
to
their
unique
optical
properties
and
flexible
compositional
tuning.
However,
luminescence
DPs
exhibits
thermal
quenching
at
high
temperatures,
which
severely
affects
further
application.
Herein,
we
synthesized
rare
earth
Dy3+
transition
metal
Mn2+
codoped
Cs2NaYCl6
characterized
using
temperature-dependent
photoluminescence
spectra
time-resolved
decay
profiles
different
temperatures.
The
Mn2+-Dy3+:Cs2NaYCl6
exhibit
stronger
with
increasing
temperature,
attributed
antithermal
quenching.
successful
incorporation
Mn
dopants
lattice
results
suppression
nonradiative
recombination,
more
efficient
energy
transfer
(ET)
Dy3+,
reduced
distortion.
These
kinds
near-infrared
promising
prospects
applications
such
as
night
vision,
radiation
detection,
solid-state
lighting,
temperature
measurement.
Abstract
Co‐doping
of
rare
earth
(RE)
and
ns
2
metal
ions
with
in
double
perovskites
shows
great
promise
for
applications
anti‐counterfeiting,
display,
radiation
detection.
However,
the
intrinsic
physical
nature
enhanced
photoluminescence
remains
unclear.
Herein,
we
use
gadolinium‐based
perovskite
as
model
propose
an
effective
strategy
co‐doping
RE3+
Sb3+
(5s
)
to
modulate
energy
transfer.
The
incorporation
Sb
3+
increases
absorption
cross
section,
thereby
overcoming
limitation
4f–4f
narrowband
transitions.
Furthermore,
acts
a
bridge
transfer,
significantly
facilitating
this
process.
Density
functional
theory
calculations
reveal
that
introduction
disrupts
symmetry
[RECl
6
]
3–
octahedra,
leading
increased
distortion.
Additionally,
electrons
octahedra
exhibit
stronger
localization
/RE
co‐doped
system,
which
enhances
Cl
–
–RE
charge
transfer
process,
increasing
radiative
transition
rates
resulting
high
quantum
yield.
Our
research
elucidates
essence
luminescence
RE‐based
from
both
experimental
theoretical
perspectives,
providing
valuable
insights
into
modulation
luminescent
properties
understanding
underlying
mechanisms
RE
doped
materials.
The Journal of Physical Chemistry Letters,
Journal Year:
2024,
Volume and Issue:
15(33), P. 8451 - 8458
Published: Aug. 9, 2024
Room-temperature
phosphorescent
(RTP)
materials
play
a
crucial
role
in
optical
anticounterfeiting
science
and
information
security
technologies.
Ionically
bonded
organic
metal
halides
have
emerged
as
promising
RTP
material
systems
due
to
their
excellent
self-assembly
unique
photophysical
property,
but
intrinsic
instability
largely
hinders
advanced
practical
applications.
Herein,
we
employ
coordination-driven
synthetic
strategy
utilizing
organocarboxylates
for
the
synthesis
of
two
isostructural
layered
lead
halide
frameworks.
The
frameworks
adopt
new
mixed-layered
topology,
consisting
alternating
[Pb
Small,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Oct. 27, 2024
Abstract
Doping
of
ns
2
metal
ions
as
an
energy
transfer
(ET)
bridge
can
significantly
elevate
the
photoluminescence
properties.
Nonetheless,
fundamental
influence
on
local
lattice
structures
remains
unclear,
hindering
advancement
functional
materials.
Herein,
Sb
3+
doped
rare
earth
double
perovskites
is
employed
a
typical
case
to
demonstrate
this
issue.
It
found
that
isoelectronic
doping
not
only
enhances
ET
efficiency
but
also
changes
their
localized
electronic
and
structures.
Both
density
theory
(DFT)
Judd–Ofelt
(J–O)
calculations
provide
unambiguous
evidence
enables
more
charge
in
[LnCl
6
]
3−
(Ln:
Lanthanide)
octahedron
reduces
symmetry
environment
around
Ln
,
facilitating
radiative
transition
rates
while
enhancing
efficiency.
Compared
with
Cs
NaScCl
:Ln
:Sb
/Ln
enhanced
by
1.5‐fold,
reaching
up
98.3%.
To
best
available
knowledge,
work
first
unravel
intrinsic
mechanism
process
enabled
via
DFT
J–O
theory.
This
research
sheds
light
understanding
photophysics
rational
design
perovskite
Angewandte Chemie,
Journal Year:
2024,
Volume and Issue:
137(1)
Published: Sept. 12, 2024
Abstract
Exploring
structural
phase
transitions
and
luminescence
mechanisms
in
zero‐dimensional
(0D)
metal
halides
poses
significant
challenges,
that
are
crucial
for
unlocking
the
full
potential
of
tunable
optical
properties
diversifying
their
functional
capabilities.
Herein,
we
have
designed
two
inter‐transformable
0D
Cu(I)‐based
halides,
namely
(C
19
H
18
P)
2
CuI
3
Cu
4
I
6
,
through
distinct
synthesis
conditions
utilizing
identical
reactants.
Their
were
systematically
elucidated
by
experiments
combined
with
density
theory
calculations.
The
bright
cyan‐fluorescent
high
photoluminescence
quantum
yield
(PLQY)
77
%
is
attributed
to
self‐trapped
exciton
emission.
Differently,
broad
yellow‐orange
fluorescence
displays
a
remarkable
PLQY
83
%.
Its
mechanism
mainly
effects
metal/halide‐to‐ligand
charge
transfer
cluster‐centered
transfer,
which
stem
from
strong
Cu−Cu
bonding
interactions
(Cu
)
2−
clusters.
Moreover,
exhibit
reversible
transitions.
elucidation
has
paved
way
an
unforgeable
anti‐counterfeiting
system.
This
system
dynamically
shifts
between
cyan
fluorescence,
triggered
transitions,
bolstering
security
authenticity.
work
enriches
offering
novel
strategies
property
modulation
fostering
applications.
ACS Applied Nano Materials,
Journal Year:
2024,
Volume and Issue:
7(22), P. 25751 - 25758
Published: Nov. 5, 2024
The
near-infrared
(NIR)
luminescent
scintillators
are
integrated
into
high
quantum
efficiency
silicon-based
photodetectors,
making
them
a
promising
solution
for
highly
efficient
radiation
detection
applications.
Halide
perovskites
scintillator
materials
due
to
their
excellent
X-ray
absorption
capacity.
However,
it
remains
challenging
realize
NIR-emitting
in
these
materials.
Fortunately,
Cs2WCl6
vacancy-ordered
double
have
shown
great
potential
as
an
NIR
emission.
currently
common
synthesis
methods
require
longer
period
or
involve
impurity
phases,
the
process
less
and
yielding
products
of
lower
purity.
In
this
study,
we
report
improved
coprecipitation
method
that
can
easily
prepare
perovskite,
offering
more
facile
process.
composition,
morphology,
phase
prepared
characterized
by
energy
dispersive
spectroscopy
(EDS),
field
emission
scanning
electron
microscopy
(FESEM),
diffraction
(XRD),
confirming
acquisition
pure-phase
perovskite
terms
luminescence,
shows
broadband
asymmetric
from
800
1250
nm
with
large
Stokes
shift
(∼560
nm).
Combined
long
excited-state
lifetime
7.34
μs,
intense
is
considered
originate
self-trapped
excitons
(STEs).
Temperature-dependent
PL
spectra
demonstrate
strong
electron–phonon
coupling,
which
induces
significant
lattice
distortion
order
produce
STEs.
Importantly,
nanocrystal
films
exhibit
radioluminescence
under
irradiation.
These
results
may
stimulate
research
application
prototype
spatial
resolution
imaging.
