Angewandte Chemie,
Год журнала:
2023,
Номер
135(25)
Опубликована: Март 8, 2023
Abstract
Ultraviolet
(UV,
λ
<400
nm)
light
is
essential
for
various
photochemical
reactions,
but
its
intensity
in
the
solar
spectrum
very
low,
and
sources
that
artificially
generate
high‐energy
UV
are
inefficient
environmentally
unfriendly.
A
solution
to
this
problem
photon
upconversion
(UC)
from
visible
(vis,
>400
light.
Among
several
mechanisms,
UC
based
on
triplet‐triplet
annihilation
(TTA‐UC)
particular
has
made
remarkable
progress
recent
years.
The
development
of
new
chromophores
enabled
highly
efficient
conversion
low‐intensity
into
In
review,
we
summarize
visible‐to‐UV
TTA‐UC,
their
production
films
application
processes
such
as
catalysis,
bond
activation
polymerization.
Finally,
challenges
opportunities
future
material
applications
will
be
discussed.
The Journal of Physical Chemistry Letters,
Год журнала:
2024,
Номер
15(17), С. 4647 - 4654
Опубликована: Апрель 22, 2024
Ultraviolet
(UV)
light
plays
a
crucial
role
in
various
applications,
but
currently,
the
efficiency
of
generating
artificial
UV
is
low.
The
visible-to-ultraviolet
(Vis-to-UV)
system
based
on
triplet–triplet
annihilation
upconversion
(TTA-UC)
mechanism
can
be
viable
solution.
Metal-free
multiple
resonance
thermally
activated
delayed
fluorescence
(MR-TADF)
materials
are
ideal
photosensitizers
(PSs)
apart
from
drawback
high
photoluminescence
quantum
yields
(PLQYs).
Herein,
we
systematically
investigated
impact
heavy-atom
effect
(HAE)
MR-TADF
sensitizers.
BNCzBr
was
then
synthesized
by
incorporating
bromine
atom
into
skeleton
precursor
BNCz.
Impressively,
internal
HAE
(iHAE)
leads
to
significantly
decreased
PLQY
and
remarkably
increased
intersystem
crossing
yield
(ΦISC).
Consequently,
higher
12.5%
realized.
While
external
(eHAE)
harms
UC
performance.
This
work
guides
further
development
sensitizers
for
high-performance
Vis-to-UV
TTA-UC
systems.
Journal of Materials Chemistry C,
Год журнала:
2022,
Номер
10(35), С. 12853 - 12862
Опубликована: Янв. 1, 2022
A
multi-mode
luminescent
system
combining
triplet–triplet
annihilation
upconversion
with
afterglow
phosphors
through
energy
transfer
is
demonstrated
and
applied
for
multi-dimensional
anti-counterfeiting
encoding
applications.
Angewandte Chemie International Edition,
Год журнала:
2023,
Номер
63(10)
Опубликована: Окт. 27, 2023
Ruthenium(II)
complexes
with
chelating
polypyridine
ligands
are
among
the
most
frequently
investigated
compounds
in
photophysics
and
photochemistry,
owing
to
their
favorable
luminescence
photoredox
properties.
Equally
good
photoluminescence
performance
attractive
photocatalytic
behavior
is
now
achievable
isoelectronic
molybdenum(0)
complexes.
The
zero-valent
oxidation
state
of
molybdenum
stabilized
by
carbonyl
or
isocyanide
ligands,
metal-to-ligand
charge
transfer
(MLCT)
excited
states
analogous
those
ruthenium(II)
can
be
established.
Microsecond
MLCT
excited-state
lifetimes
quantum
yields
up
0.2
have
been
achieved
solution
at
room
temperature,
emission
wavelength
has
become
tunable
over
a
large
range.
stronger
photoreductants
than
polypyridines
therefore
perform
more
challenging
chemical
reductions.
triplet
nature
luminescent
allows
sensitization
photon
upconversion
via
triplet-triplet
annihilation,
convert
low-energy
input
radiation
into
higher-energy
output
fluorescence.
This
review
summarizes
current
art
concerning
highlights
application
potential.
Molybdenum
roughly
140
times
abundant
far
cheaper
ruthenium,
hence
this
research
relevant
greater
context
finding
sustainable
alternatives
using
precious
rare
transition
metals
photochemistry.
Angewandte Chemie,
Год журнала:
2023,
Номер
135(25)
Опубликована: Март 8, 2023
Abstract
Ultraviolet
(UV,
λ
<400
nm)
light
is
essential
for
various
photochemical
reactions,
but
its
intensity
in
the
solar
spectrum
very
low,
and
sources
that
artificially
generate
high‐energy
UV
are
inefficient
environmentally
unfriendly.
A
solution
to
this
problem
photon
upconversion
(UC)
from
visible
(vis,
>400
light.
Among
several
mechanisms,
UC
based
on
triplet‐triplet
annihilation
(TTA‐UC)
particular
has
made
remarkable
progress
recent
years.
The
development
of
new
chromophores
enabled
highly
efficient
conversion
low‐intensity
into
In
review,
we
summarize
visible‐to‐UV
TTA‐UC,
their
production
films
application
processes
such
as
catalysis,
bond
activation
polymerization.
Finally,
challenges
opportunities
future
material
applications
will
be
discussed.
