Enhancement of Photoluminescence Quantum Yield of Silver Clusters by Heavy Atom Effect
Small,
Год журнала:
2025,
Номер
unknown
Опубликована: Март 3, 2025
Abstract
Many
ligand‐protected
metal
clusters
exhibit
phosphorescence
at
room
temperature.
However,
strategies
for
improving
their
quantum
yield,
a
critical
parameter
of
performance,
remain
poorly
developed.
In
contrast,
fluorescent
dyes
are
commonly
modified
by
introducing
heavy
atoms,
such
as
iodine
(I),
to
enhance
intersystem
crossing
in
the
excited
state,
thereby
harnessing
atom
effect
increase
efficiency.
this
study,
pair
silver
(Ag)
is
successfully
synthesized
with
internal
cavities
encapsulating
anions
(X
z
−
),
namely
sulfide
ions
(S
2−
)
or
iodide
(I
which
significantly
differ
atomic
number
each
other.
Single‐crystal
X‐ray
diffraction
and
nuclear
magnetic
resonance
spectroscopy
revealed
that
resulting
Ag
composed
X@Ag
54
S
20
(thiolate)
(sulfonate)
m
,
where
(X,
=
(S,
12)
(I,
11).
photoelectron
atoms
these
compounds
mixed‐valence
state.
Furthermore,
experiments
on
photoluminescence
central
anion
induced
an
heavy‐atom
similar
observed
organic
dyes.
As
result,
yield
became
16
times
higher
when
replaced
I
atom.
Язык: Английский
Recent Advances in Understanding Triplet States in Metal Nanoclusters: Their Formation, Energy Transfer, and Applications in Photon Upconversion
The Journal of Physical Chemistry Letters,
Год журнала:
2024,
Номер
unknown, С. 12257 - 12268
Опубликована: Дек. 5, 2024
Recent
experimental
findings,
rapidly
accumulating
over
the
past
few
years,
has
revealed
that
in
electronic
excited
states
of
metal
nanoclusters
(MNCs)
composed
noble
atoms
(e.g.,
Cu,
Ag,
or
Au),
triplet
are
generated
with
remarkably
high
efficiency,
exerting
a
pivotal
influence
photophysical
properties
MNCs,
notably
their
photoluminescence
characteristics.
As
result,
MNCs
increasingly
recognized
as
promising
luminescent
nanomaterials
exhibit
room-temperature
phosphorescence
and
thermally
activated
delayed
fluorescence.
Furthermore,
significance
triplet-state-mediated
energy
transfer
charge
intermolecular
processes
is
gaining
increasing
recognition,
particularly
applications
photosensitizers
for
singlet
oxygen
organic
molecular
triplets.
This
Perspective
focuses
on
recent
advances
understanding
formation
photophysics
MNCs.
Additionally,
brief
overview
provided
series
studies
exploring
use
sensitizers
photon
upconversion
via
triplet-triplet
annihilation,
future
prospects
this
emerging
application
discussed.
Язык: Английский