Near-infrared
(NIR)
to
blue
triplet-triplet
annihilation
upconversion
(TTA-UC)
shows
unique
applications
in
optogenetics,
photocaging,
and
stereoscopic
three-dimensional
printing,
etc.
Here,
we
disclose
a
strategy
that
narrowed
the
energy
gap
between
triplet
states
of
NIR
photosensitizer
annihilator,
with
aim
maximally
suppressing
photoexcitation
loss
during
TET.
Hence,
produced
NIR-to-blue
TTA-UC
pair
exhibited
an
exceptionally
large
anti-Stokes
shift
(0.76
eV)
achieved
record
quantum
yield
(15.5%,
out
50%).
We
further
prepared
for
first
time
small,
water-dispersed,
oxygen-resistant
nanoparticles
up
1.8%.
Such
upconverted
were
successfully
utilized
as
NIR-responsive
photocatalysts
reversible
transformation
enzyme
cofactor
NAD+/NADH
photobiocatalytic
system
air-saturated
aqueous
solutions.
Chemical Reviews,
Год журнала:
2023,
Номер
123(18), С. 10877 - 10919
Опубликована: Сен. 8, 2023
The
interaction
between
molecular
electronic
transitions
and
electromagnetic
fields
can
be
enlarged
to
the
point
where
distinct
hybrid
light-matter
states,
polaritons,
emerge.
photonic
contribution
these
states
results
in
increased
complexity
as
well
an
opening
modify
photophysics
photochemistry
beyond
what
normally
seen
organic
molecules.
It
is
today
evident
that
polaritons
offer
opportunities
for
photophysics,
which
has
caused
ever-rising
interest
field.
Focusing
on
experimental
landmarks,
this
review
takes
its
reader
from
advent
of
field
polaritonic
chemistry,
over
split
into
polariton
chemistry
photochemistry,
present
day
status
within
photophysics.
To
introduce
field,
starts
with
a
general
description
interactions,
how
enhance
these,
characterizes
coupling
strength.
Then
strongly
coupled
systems
using
Fabry-Perot
plasmonic
cavities
are
described.
This
followed
by
room-temperature
Bose-Einstein
condensation/polariton
lasing
systems.
ends
discussion
benefits,
limitations,
future
developments
strong
exciton-photon
Chemical Reviews,
Год журнала:
2024,
Номер
unknown
Опубликована: Дек. 12, 2024
Since
the
seminal
report
by
Adachi
and
co-workers
in
2012,
there
has
been
a
veritable
explosion
of
interest
design
thermally
activated
delayed
fluorescence
(TADF)
compounds,
particularly
as
emitters
for
organic
light-emitting
diodes
(OLEDs).
With
rapid
advancements
innovation
materials
design,
efficiencies
TADF
OLEDs
each
primary
color
points
well
white
devices
now
rival
those
state-of-the-art
phosphorescent
emitters.
Beyond
electroluminescent
devices,
compounds
have
also
found
increasing
utility
applications
numerous
related
fields,
from
photocatalysis,
to
sensing,
imaging
beyond.
Following
our
previous
review
2017
(
Journal of the American Chemical Society,
Год журнала:
2023,
Номер
145(20), С. 11402 - 11414
Опубликована: Май 15, 2023
Sensitized
triplet–triplet
annihilation
upconversion
is
a
promising
strategy
to
use
visible
light
for
chemical
reactions
requiring
the
energy
input
of
UV
photons.
This
avoids
unsafe
ultraviolet
sources
and
can
mitigate
photo-damage
provide
access
reactions,
which
filter
effects
hamper
direct
excitation.
Here,
we
report
new
approach
make
blue-to-UV
more
amenable
photochemical
applications.
The
tethering
naphthalene
unit
cyclometalated
iridium(III)
complex
yields
bichromophore
with
high
triplet
(2.68
eV)
naphthalene-based
reservoir
featuring
lifetime
72.1
μs,
roughly
factor
20
longer
than
photoactive
excited
state
parent
complex.
In
combination
three
different
annihilators,
consistently
lower
thresholds
crossover
from
quadratic
into
linear
excitation
power
dependence
regime
were
observed
compared
system
composed
2,5-diphenyloxazole
annihilator
sufficiently
robust
under
long-term
blue
irradiation
continuously
high-energy
singlet-excited
that
drive
normally
light.
Both
photoredox
transfer
catalyses
feasible
using
this
concept,
including
reductive
N–O
bond
cleavage
Weinreb
amides,
C–C
coupling
reaction
based
on
aryl
debromination,
two
Paternò–Büchi
[2
+
2]
cycloaddition
reactions.
Our
work
seems
relevant
in
context
developing
strategies
driving
energetically
demanding
photochemistry
low-energy
The Journal of Physical Chemistry Letters,
Год журнала:
2024,
Номер
15(10), С. 2690 - 2696
Опубликована: Март 1, 2024
A
cocrystallization
strategy
is
used
through
incorporation
of
1,2,4,5-tetracyanobenzene
(TCNB)
as
an
acceptor
with
halogen-substituent
thioxanthone
(TX)
derivatives
donors.
The
resulting
cocrystals
TT-R
(R
=
H,
F,
Cl,
Br,
or
I)
transform
the
thermally
activated
delayed
fluorescence
emission
in
TT-H,
TT-F,
and
TT-Cl
to
room-temperature
phosphorescence
TT-Br
TT-I
cocrystals.
Definite
crystal
packing
structures
demonstrate
a
1:1
alternative
donor–acceptor
stacking
TT-H
cocrystal,
2:1
TT-F
cocrystals,
separate
donor
transformation
law
can
be
revealed
that
increase
atomic
number
from
I,
show
structural
aggregated
TX-R
molecules
monomers
dimers
finally
multimers.
This
work
will
facilitate
understanding
effect
halogen
substituents
on
structure
luminescence
properties
Journal of Materials Chemistry A,
Год журнала:
2023,
Номер
11(16), С. 8515 - 8539
Опубликована: Янв. 1, 2023
Singlet
fission
(SF),
which
can
convert
one
singlet
exciton
into
two
triplet
excitons,
has
the
potential
to
enhance
solar
energy
conversion
efficiency
in
devices
such
as
photovoltaic
cells
and
processes
photocatalysis.
