Polymers for Advanced Technologies,
Год журнала:
2023,
Номер
35(1)
Опубликована: Дек. 1, 2023
Abstract
This
work
investigated
the
influence
of
melamine
up
to
15
wt%
on
stimulation
response
properties
organic
silicone
polymer
elastomer.
The
opacity
film
was
attributed
addition
melamine.
For
and
composite
thin
films,
deformation
increased
from
152
172%,
because
density
NH···O
type
hydrogen
bond
decreased
thermal
motion
chain.
fluorescence
phosphorescence
spectra
indicated
that
maximum
luminescence
wavelength
red‐shifted
about
14
nm.
Elastomer
with
exhibited
two‐dimensional
stimulus
performance
change
scale
shape‐time‐afterglow
emission
properties.
derived
energy
donor
In
summary,
study
provides
detailed
guidelines
for
preparation
multi‐dimensional
room
temperature
phosphorescent
elastic
materials.
Abstract
It
is
still
very
challenging
to
obtain
colorful
and
long‐afterglow
room‐temperature
phosphorescent
(RTP)
materials
from
pure
organic
polymers.
Herein,
it
found
that
chitosan
(CS),
a
natural
polymer,
not
only
has
its
own
RTP,
but
also
reacts
with
different
molecules
multicolor,
RTP
material.
CS
can
emit
lifetime
of
48
ms.
In
addition,
rich
in
amino
groups,
grafting
onto
by
an
amidation
reaction
modulate
colors
phosphorescence
series
derivatives.
The
obtained
polymer
films
have
ultra‐long
due
the
good
film‐forming
ability.
one
derivatives
selected
α‐cyclodextrin
used
construct
lifetimes
up
seconds.
host–guest
interactions
are
suppress
nonradiative
relaxation
build
crystalline
domains,
thus
synergistically
enhancing
RTP.
Interestingly,
properties
derivative
extremely
sensitive
water
heat
stimuli,
because
broke
hydrogen
bonds
between
adjacent
altered
rigid
environment
Finally,
they
be
as
stimuli‐responsive
ink
for
monitoring
environmental
humidity.
Advanced Materials,
Год журнала:
2023,
Номер
36(3)
Опубликована: Окт. 2, 2023
A
rational
molecular
design
strategy
facilitates
the
development
of
a
purely
organic
room-temperature
phosphorescence
(RTP)
material
system
with
precisely
regulated
luminescence
properties,
which
surely
promotes
its
functional
integration
and
intelligent
application.
Here,
unit
combination
is
proposed
to
novel
RTP
molecules
combining
folding
diverse
luminescent
cores.
The
different
cores
are
mainly
responsible
for
tunable
while
contributes
spin-orbit
coupling
(SOC)
enhancement,
makes
as
workable
building
block
principle.
By
this
strategy,
series
color/lifetime-tunable
materials
achieved
unique
photo-responsive
enhancement
when
subjected
UV
irradiation,
expands
their
application
scenarios
in
reusable
privacy
tags,
advanced
"4D"
encryption,
phase
separation
analysis
blended
polymers.
This
work
suggests
simple
effective
color
lifetime,
also
provides
new
options
dynamic
materials.
Chemical Science,
Год журнала:
2023,
Номер
14(10), С. 2640 - 2645
Опубликована: Янв. 1, 2023
The
pressure-dependent
luminescence
behavior
of
purely
organic
compounds
is
an
important
topic
in
the
field
stimulus-responsive
smart
materials.
However,
relevant
studies
are
mainly
limited
to
investigation
fluorescence
properties,
while
room-temperature
phosphorescence
(RTP)
has
not
been
investigated.
Here,
we
filled
this
gap
regarding
RTP
by
using
a
model
molecule
selenanthrene
(SeAN)
with
folded
geometry.
For
first
time
best
our
knowledge,
unique
phenomenon
involving
pressure-induced
enhancement
was
discovered
SeAN
crystal,
and
underlying
mechanism
folding-induced
spin-orbit
coupling
revealed.
Pressure-induced
also
observed
analog
showing
geometry,
but
case
yielded
white-light
emission
that
very
rare
RTP-displaying
Advanced Optical Materials,
Год журнала:
2024,
Номер
12(17)
Опубликована: Апрель 9, 2024
Abstract
Despite
rapid
progress
and
wide
applications
of
room
temperature
phosphorescence
(RTP)
materials,
it
is
still
a
great
challenge
to
optimize
the
RTP
activity
through
rational
structural
design
at
molecular
level.
Herein,
successful
cationic
engineering
strategy
demonstrated
modulate
crystal
flexibility
achieving
controllable
in
new
pair
metal
halides
[APML]ZnCl
4
([APML]
=
N‐(3‐Aminopropyl)morpholine)
[AEML]ZnCl
([AEML]
N‐(2‐Aminoethyl)morpholine).
Both
display
blue
fluorescence
under
365
nm
UV.
Comparing
with
longer
[APML]
+
,
shorter
[AEML]
significantly
enhances
rigidity
restrains
non‐radiative
scattering,
boosting
photoluminescence
quantum
yield
(PLQY)
from
18.89%
22.41%.
Synchronously,
enhanced
promotes
inter‐system
crossing
singlet
triplet
excited
states.
As
consequence,
displays
long‐lived
green
property
millisecond
scale
lifetime
contrast
blank
.
Comprehensive
investigations
demonstrate
that
energy
transfer
between
inorganic
organic
components
greatly
changes
redistribution
states,
resulting
distinct
activity.
The
different
short‐lived
provide
color‐time‐dual‐resolved
luminescent
tag
advanced
anti‐counterfeiting,
etc.
This
work
highlights
achieve
affording
guide
rationally
materials.
Sensors,
Год журнала:
2022,
Номер
22(8), С. 2944 - 2944
Опубликована: Апрель 12, 2022
Room-temperature
phosphorescent
(RTP)
carbon
dots
(CDs)
have
promising
applications
in
bioimaging,
anticounterfeiting,
and
information
encryption
owing
to
their
long
lifetimes
wide
Stokes
shifts.
Numerous
researchers
are
interested
developing
highly
bright
RTP
CDs
using
environmentally
friendly
safe
synthesis
processes
(e.g.,
natural
raw
materials
zero-pollution
production
pathways).
In
this
study,
we
successfully
synthesized
a
hydrothermal
process
employing
vitamins
as
material,
ethylenediamine
passivator,
boric
acid
enhancer,
which
is
referred
CD
(PCD).
The
PCDs
exhibit
both
blue
fluorescence
emission
green
emission,
with
phosphorescence
lifetime
293
ms
an
excellent
afterglow
visible
the
naked
eye
for
up
7.0
s.
total
quantum
yield
12.69%.
(PQY)
5.15%.
Based
on
performance,
been
employed
anticounterfeiting
protection
applications.
results
of
study
provide
strategy
scalable
materials,
practical
method
fabrication
high
efficiency
lifetimes.
Chemical Science,
Год журнала:
2023,
Номер
14(36), С. 9733 - 9743
Опубликована: Янв. 1, 2023
A
functional
unit
combination
strategy
was
proposed
to
achieve
red
room-temperature
phosphorescence,
in
which
the
folded
enhances
spin–orbit
coupling,
while
benzo[
c
][2,1,3]thiadiazole
dominates
emission
color.
Abstract
Full
utilization
of
the
excited
species
at
both
singlet
states
(
1
R*)
and
triplet
3
is
crucial
to
improving
electrochemiluminescence
(ECL)
efficiency
but
challenging
for
organic
luminescent
materials.
Here,
an
aggregation‐induced
delayed
ECL
(AIDECL)
active
dot
(OD)
containing
a
benzophenone
acceptor
dimethylacridine
donor
reported,
which
shows
high
via
reverse
intersystem
crossing
(RISC)
non‐emissive
R*
emissive
R*,
overcoming
spin‐forbidden
radiative
decay
from
R*.
By
introducing
dual
donor‐acceptor
pairs
into
luminophores,
it
found
that
nonradiative
pathway
could
be
further
suppressed
enhanced
intermolecular
weak
interactions,
multiple
spin‐up
conversion
channels
activated.
As
consequence,
obtained
OD
enjoys
6.8‐fold
higher
relative
control
AIDECL‐active
OD.
Single‐crystal
studies
theoretical
calculations
reveal
AIDECL
behaviors
come
acceleration
transition
RISC.
This
work
represents
major
step
towards
purely
organic,
high‐efficiency
dyes
direction
design
next‐generation
molecular
level.
The Journal of Physical Chemistry B,
Год журнала:
2023,
Номер
127(6), С. 1385 - 1398
Опубликована: Фев. 3, 2023
In
this
study,
we
report
a
comprehensive
time-resolved
spectroscopic
investigation
of
the
excited-state
deactivation
mechanism
in
three
push–pull
isomers
characterized
by
phenothiazine
electron
donor,
benzothiazole
acceptor,
and
phenyl
π-bridge
where
connection
is
realized
at
relative
ortho,
meta,
para
positions.
Spin–orbit
charge-transfer-induced
intersystem
crossing
takes
place
with
high
yield
these
all-organic
donor–acceptor
compounds,
leading
also
to
efficient
production
singlet
oxygen.
Our
results
give
clear
evidence
room-temperature
phosphorescence
not
only
solid-state
host–guest
matrices
but
highly
biocompatible
aggregates
produced
water
dispersions,
as
rarely
reported
literature.
Moreover,
could
be
internalized
lung
cancer
melanoma
cells
display
bright
luminescence
without
any
dark
cytotoxic
effect.
On
other
hand,
showed
significant
cellular
phototoxicity
against
tumor
due
light-induced
reactive
oxygen
species
generation.
findings
strongly
suggest
that
nanoaggregates
investigated
are
promising
candidates
for
imaging-guided
photodynamic
therapy.
Chemical Science,
Год журнала:
2024,
Номер
15(31), С. 12598 - 12605
Опубликована: Янв. 1, 2024
Exploring
strategies
to
enhance
reverse
intersystem
crossing
(RISC)
is
of
great
significance
develop
efficient
thermally
activated
delayed
fluorescent
(TADF)
molecules.
In
this
study,
we
investigate
the
substantial
impact
nonplanar
structure
on
improving
rate
RISC
(
