Effect of Thermally Reversible Conformers on Delayed Fluorescence and Temperature Sensing
The Journal of Physical Chemistry C,
Год журнала:
2024,
Номер
128(21), С. 8750 - 8758
Опубликована: Май 16, 2024
Achieving
thermally
enhanced
delayed
emission
(TEDE)
through
reversible
conformational
changes
in
organic
conjugate
acid–base
pairs
poses
significant
challenges
the
design
process.
Here,
we
present
a
novel
approach
utilizing
isomerization
to
attain
TEDE
from
three
distinct
twisted
donor–acceptor
conjugates
(PTzQF,
PTzQCl,
and
PTzQBr).
These
feature
phenothiazine
covalently
linked
8-position
of
quinoline
segment
via
C–N
single
bond,
with
4-fluorophenyl,
4-chlorophenyl,
4-bromophenyl
substituents
at
2,4-positions
naphthyl
unit
8-position.
Through
detailed
spectroscopic
studies
quantum
chemistry
calculations,
unveil
that
doped
within
host
[1,3-bis(N-carbazolyl)benzene]
(mCP)
exhibit
luminescence,
involving
both
locally
excited
(LE)
guest
charge
transfer
(CT)
emissions.
Upon
heating,
luminescence
quenching
effect
occurs
on
violet
LE
emission,
while
orange
fluorescence
(DF)
experiences
enhancement
elevated
temperatures
ranging
10
350
K.
Conversely,
cooling
triggers
reversal
back
emission.
The
induced
change
guests
leads
modulation
DF
due
slight
energy
difference
between
conformers
(7.64
kcal/mol).
Meanwhile,
control
nonradiative
transitions
during
heating
(350
K)
(10
influences
band.
Employing
ratiometric
response
(RLR)
blended
films,
devise
RLR-thermometers
showcasing
absolute
relative
sensitivities
0.06973
0.52839
0.017
0.025%,
temperature
resolutions
0.0012
0.063
this
study,
aim
provide
insights
into
sensing
host–guest
modulation.
Язык: Английский
Shaking Up the Friedländer Reaction: Rapid, Scalable Mechanochemical Synthesis of Polyaryl‐substituted Quinolines
Advanced Synthesis & Catalysis,
Год журнала:
2024,
Номер
unknown
Опубликована: Авг. 16, 2024
Abstract
Quinolines
are
ubiquitous
heterocyclic
aromatic
scaffolds,
which
can
be
found
in
many
natural
and
synthetic
products.
They
highly
valued
for
their
pharmacological
electrochemical
properties,
encouraging
the
discovery
of
new
routes
quinoline
synthesis
diversification.
In
particular,
polyaryl‐substituted
quinolines
have
recently
surged
as
useful
substrates
a
wide
variety
applications,
yet
remain
difficult
inefficient.
Herein,
we
report
rapid
novel
mechanochemical
Friedländer
under
basic
conditions
using
ball
milling.
The
optimized
reaction
resulted
moderate
to
excellent
yields
ranging
from
48%
>95%
demonstrated
broad
functional
group
tolerance
at
1
hour
times.
We
further
show
route
photocatalyst
DPQN
2,4−di−OMe
photo‐ligand
PPQN
well
OLED
donor‐acceptor
pCzPPQ,
electron
transport
material
oligoquinoline
TQB
organic
semiconductor
DPA.
A
gram
scale
was
also
achieved
Resonant
Acoustic
Mixing
(RAM),
providing
an
isolated
yield
87%
after
simple
recrystallization
ethanol.
Язык: Английский
Mixed Emission of Acenaphtho[1,2-b] Quinoxaline Regioisomers
The Journal of Physical Chemistry C,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 20, 2025
Язык: Английский
Enhanced Delayed Fluorescence in Nonlocal Metasurfaces: The Role of Electronic Strong Coupling
ACS Photonics,
Год журнала:
2025,
Номер
unknown
Опубликована: Март 25, 2025
Strong
light-matter
coupling
has
garnered
significant
attention
for
its
potential
to
optimize
optoelectronic
responses.
In
this
study,
we
designed
open
cavities
featuring
nonlocal
metasurfaces
composed
of
aluminum
nanoparticle
arrays.
The
surface
lattice
resonances
in
these
exhibit
electronic
strong
with
the
boron
difluoride
curcuminoid
derivative,
which
is
known
highly
efficient
thermally
activated
delayed
fluorescence
near-infrared.
Our
results
show
that
induced
by
triplet-triplet
annihilation
can
be
enhanced
a
factor
2.0-2.6
are
either
tuned
or
detuned
molecular
transition.
We
demonstrate
enhancements
systems
primarily
stem
from
increased
absorption
organic
layer
caused
array,
while
negligible
effects
on
reverse
intersystem
crossing
rates,
aligning
previous
studies.
support
findings
finite-difference-time-domain
simulations.
This
study
elucidates
how
interactions
affect
fluorescence,
highlighting
applications
devices.
Язык: Английский
Triarylboron-Based Dual Thermally Activated Delayed Fluorescence Emitter for Single Molecule White Light-Emitting Diodes
ACS Applied Materials & Interfaces,
Год журнала:
2025,
Номер
unknown
Опубликована: Март 26, 2025
Single-molecule
emitters
with
dual
thermally
activated
delayed
fluorescence
(TADF)
characteristics
are
very
promising
for
application
in
organic
light-emitting
diodes
(OLEDs).
Rarely
reported,
dual-TADF
materials,
especially
mechanochromic
demand.
We
present
two
donor-acceptor
emitters,
Mes*BA-Ac
and
FXylBA-Ac,
which
exhibit
the
solid
state
due
to
separation
of
HOMO
LUMO
strong
intermolecular
interactions.
Their
phase
transition
from
amorphous
crystalline
under
stimuli
leads
switchable
TADF
emissions.
By
blending
poly(methyl
methacrylate),
we
achieve
pure
white
light
Commission
Internationale
de
l'Eclairage
(CIE)
coordinates
(0.33,
0.32).
Furthermore,
single-molecule
(SM-WOLEDs)
using
have
been
fabricated,
reaching
a
maximum
external
quantum
efficiency
(EQEmax)
1.65%
CIE
(0.30,
0.31).
More
importantly,
emission
mechanism
enables
devices
maintain
stable
white-light
across
relatively
wide
voltage
range,
providing
valuable
insights
advancement
SM-WOLEDs.
Язык: Английский
Modulated dual photo/electro luminescence via molecular engineering of Ds-A-Dw type TADF materials
Chemical Engineering Journal,
Год журнала:
2024,
Номер
unknown, С. 156529 - 156529
Опубликована: Окт. 1, 2024
Язык: Английский
Lanthanide‐Tetradentate Schiff Base‐PMMA Composite Films for Tunable White Light Emission
Advanced Optical Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Дек. 25, 2024
Abstract
Multicolor
emissive
Schiff
base
lanthanide
Poly(methyl
methylacrylate)
[PMMA]
composite
films
are
fabricated
for
white
light
generation.
Three
isostructural
lanthanides
(III)
complexes
[Eu
III
2
(L)
(NO
3
)
(
dmf
1
),
Tb
and
Gd
)]
synthesized,
characterized
from
the
ligand
obtained
by
1:1
condensation
of
salicylaldehyde
2‐(2‐Aminoethoxy)ethanol,
H
L.
The
photoluminescent
studies
revealed
pure
blue,
green,
red
color
emissions
L,
Eu
L
complexes,
although
central
metal
centers
have
identical
dodecahedron
geometry.
Intensified
emission
is
attested
blue
emitter‐Gd
complex
while
“antenna
effect”
witnessed
green
complexes.
Co‐doping
these
multicolor
luminescent
emitters
into
PMMA
polymer
intensity
luminescence
improved.
A
conscientious
combination
red‐Eu
with
green‐Tb
Lanthanide
in
a
specified
concentration,
distinct
accomplished
first
time
Commission
Internationale
de
I’Éclairage
(CIE)
values
0.33,
0.30,
very
close
to
ideal
emitter.
newly
developed
lanthanide‐Schiff
base‐PMMA
transparent
highly
desired
materials
optoelectronics,
microscopy,
sensing.
Язык: Английский