Journal of Applied Polymer Science,
Год журнала:
2024,
Номер
unknown
Опубликована: Ноя. 22, 2024
ABSTRACT
Recently,
non‐traditional
intrinsic
luminescence
(NTIL)
polymers
containing
ester
groups
have
gained
widely
attention
due
to
their
potential
in
fluorescence
materials
application.
As
a
common
engineering
plastic,
polybutylene
terephthalate
(PBT)
possesses
traditional
luminescent
center
benzene
ring
and
carbonyl
group
on
the
molecular
chain,
yet
characteristics
of
PBT
rarely
been
reported.
Herein,
series
PBT‐based
copolyesters
x
A
y
were
prepared
by
two‐step
melt
polycondensation
this
work.
By
introducing
flexible
aliphatic
diacid
into
exhibited
unexpected
properties
under
excitation
350
nm
UV
lamp.
Besides,
emission
wavelength
could
be
tunable
from
439
468
changing
chemical
structure.
Consequently,
study
provides
facial
economical
approach
prepare
fluorescent
copolyesters,
which
exist
great
as
plastic
future.
Accounts of Chemical Research,
Год журнала:
2025,
Номер
unknown
Опубликована: Фев. 7, 2025
ConspectusNonconventional
luminophores,
characterized
by
the
absence
of
extended
(hetero)aromatic
building
blocks
and
alternating
single-double/triple
bonds,
are
composed
primarily
electron-rich
moieties,
such
as
heteroatoms,
double
aliphatic
amines,
carbonyls,
hydroxyls,
cyano
groups,
amides,
their
grouped
functionalities.
These
unique
structural
features,
coupled
with
intriguing
luminescent
properties,
have
garnered
significant
interest
for
both
fundamental
research
promising
applications,
thus
enabling
widespread
exploration.
They
generally
benefit
from
abundant
resources,
simple
synthesis,
outstanding
biocompatibility,
excellent
photostability,
empowering
potential
applications
in
bioimaging,
data
storage
encryption,
anticounterfeiting,
bio-
chemosensing,
etc.
However,
is
preliminary,
luminescence
mechanisms
remain
elusive.
For
diverse
systems,
proposed
conjectures,
including
tertiary
amine
oxidation,
proton
transfer,
impurities,
hydrogen
bonding,
peptide
bond
electron
delocalization,
lack
consistent
correlation
universality,
some
being
subsequently
invalidated.
This
a
unifying
framework
has
hampered
development
effective
guidelines
molecular
design
photoluminescence
(PL)
regulation.
To
address
these
issues,
clustering-triggered
emission
(CTE)
mechanism,
focusing
on
electron-molecule-aggregate
multilevel
structure-activity
relationships,
been
proposed.
Specifically,
it
identifies
"clustered
chromophores"
moieties
emissive
species.
The
CTE
mechanism
not
only
elucidates
behaviors
nonconventional
luminophores
but
also
guides
PL
regulation
further
novel
multifunctional
materials.This
Account
begins
concise
introduction
to
highlighting
significance
delocalization
(through-space
conjugation)
within
groups.
It
then
delves
into
insights
gained
various
identifying
three
core
components
mechanism:
clustering,
conformational
rigidity
resulting
clusters.
proves
be
rational
universally
applicable,
encompassing
natural
products,
(macro)biomolecules,
synthetic
compounds
extending
singlet
fluorescence
triplet
phosphorescence.
By
strategically
coordinating
elements,
feasible
modulate
intra/intermolecular
interactions,
through-space
conjugation,
spin-orbit
coupling
clusters,
achieving
red/near-infrared
(NIR)
room-temperature
phosphorescence
(RTP)
systems
through
internal/chemical
(e.g.,
incorporating
additional
bridging
units
heavy
atoms)
external/physical
pressurization,
conformation
adjustments)
methods.
Furthermore,
we
investigate
integration
emitters
other
conventional
functional
groups
or
substrates
realize
tunable
photophysical
properties
controlling
clustering
states.
approach
leads
new
materials
exhibiting
synergistic
merits
high
efficiency,
film-forming
ability,
excitation-
time-dependent
afterglows,
photochromic
arising
subtle
rearrangement
crystals.
information
storage,
fibers,
bioimaging
explored.
Finally,
concludes
forward-looking
perspective
challenges
future
luminophores.
Macromolecular Chemistry and Physics,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 16, 2025
Abstract
Nonconventional
luminescent
materials
(NLMs)
lacking
extended
π‐conjugated
systems
present
a
burgeoning
field
with
vast
potential
applications
in
cell
image,
and
chemical
sensing.
This
work
explores
the
synthesis,
characterization,
promising
of
novel
NLM
quaternary
ammonium
chitosan
(QCS),
bioimaging
selective
sensing
where
solutions
exhibit
remarkable
tunability
their
photophysical
properties,
influenced
by
concentration,
excitation
wavelength,
temperature.
Notably,
applying
static
pressure
to
solid
sample
significantly
enhances
its
luminous
efficiency,
rising
from
2.15%
2.59%,
inducing
redshift
emission,
emission
shifting
436
452
nm
after
force
action.
Furthermore,
QCS
demonstrates
highly
specific
fluorescent
response
toward
sodium
chlorite
(NaClO₂)
negligible
interference
common
cations
anions.
The
detection
limit
for
NaClO₂
reaches
low
0.297
mg
L
−1
,
highlighting
practical
applications.
Additionally,
exhibits
excellent
biocompatibility
cytotoxicity,
making
it
compelling
candidate
cellular
imaging.
Macromolecular Chemistry and Physics,
Год журнала:
2025,
Номер
unknown
Опубликована: Фев. 20, 2025
Abstract
Fluorescent
supramolecular
materials
have
attracted
a
lot
of
attention
over
the
past
few
decades.
However,
those
can
respond
to
multiple
stimuli
are
not
often
reported,
especially
for
nonconventional
fluorescent
materials.
Here,
material
is
reported
that
temperature/electrical
heating,
humidity,
volatile
acids/organic
amines,
and
mechanical
strain.
This
prepared
by
physical
mixing
oligomeric
polyethyleneimine
(o‐PEI)
polyacrylic
acid
(o‐PAA).
Although
they
almost
non‐fluorescent,
their
combination
produces
bright
fluorescence,
emission
bands
shift
longer
wavelengths
as
amount
o‐PAA
increases.
Calculations
based
on
Density
Functional
Theory
(DFT)
show
there
strong
noncovalent
interactions
between
o‐PEI
o‐PAA,
resulting
in
through‐space
conjugation
cluster‐triggered
emission.
By
studying
relationship
intensity,
temperature,
molecular
motion,
dependence
intensity
relaxation
time
established,
which
will
provide
insight
into
luminescence
origin
In
addition,
this
shows
good
self‐healing
ability.
The
luminescence,
responsiveness
self‐reparability
all
related
but
reversible
bonds
link
o‐PAA.
work
only
highlights
value
polymers,
also
enriches
research
RSC Advances,
Год журнала:
2025,
Номер
15(10), С. 7383 - 7471
Опубликована: Янв. 1, 2025
Thermally
Activated
Delayed
Fluorescence
(TADF)
materials
have
emerged
as
a
revolutionary
class
of
functional
compounds,
driven
by
their
unique
ability
to
utilize
excitons
from
both
singlet
and
triplet
states
for
efficient
fluorescence
emission.
This
manuscript
provides
an
overview
recent
innovations
in
TADF
material
design,
focusing
on
molecular
strategies
achieve
optimal
properties,
including
small
singlet-triplet
energy
gaps
(ΔE
ST)
high
photoluminescence
quantum
yields.
We
explore
the
diverse
applications
materials,
spanning
OLEDs,
biomedical
imaging,
photosensitizers,
photocatalysis,
UV
photodetectors
(UVOPDs),
electrogenerated
chemiluminescence,
triplet-triplet
annihilation
(TTA)
sensitizers,
organic
hybrid
microwire
radial
heterojunctions,
multicolor
luminescent
micelles,
mechano-luminescence
(ML),
light-emitting
electrochemical
cells
(LEECs),
fluorescent
probes.
The
integration
these
technologies
highlights
potential
enhance
performance
efficiency.
Through
this
review,
we
aim
elucidate
fundamental
principles
governing
behavior
present
forward-looking
perspective
synthetic
methodologies
new,
versatile
materials.
Journal of Materials Chemistry C,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 1, 2025
Experimental
and
computational
studies
of
polyurethane
derivatives
provide
new
insights
into
the
mechanism
luminescence
in
non-conjugated
molecules.
Applications
as
biological
probes
information
transmission
materials
are
demonstrated.
ABSTRACT
The
development
of
nontraditional
luminogens
(NTLs)
with
superior
photoluminescence
(PL)
properties
is
great
scientific
and
practical
significance
has
drawn
rapidly
growing
interest
in
recent
years.
An
extremely
important
but
unresolved
question
that
if
there
are
any
distinct
differences
the
structures
PL
mechanisms
between
traditional
(TLs)
NTLs.
In
this
work,
four
dihydropyridine
derivatives
strong
non‐aromatic
through‐bond
conjugation
(TBC)
were
designed
synthesized,
influence
TBC
through‐space
(TSC)
effects
on
their
behaviors
was
studied.
These
compounds
solutions
show
significant
concentration‐dependent
emission
(CDE)
excitation‐dependent
(EDE),
which
typical
solid
state,
wide
excitation
spectra
while
narrow
spectra,
high
quantum
yields
up
to
57.4%,
they
do
not
EDE,
similar
TLs.
And
very
impressively,
two
kinds
crystals
also
exhibit
optical
waveguide
property,
first
report
UV–vis
crystal
structures,
theoretical
calculations
prove
presence
large
interactions
these
NTLs,
TSC
can
be
formed
among
molecules
a
planar
conformation
stacked
into
layers
through
intermolecular
hydrogen
bonding
π⋅⋅⋅π
interactions.
combined
effect
endows
unique
those
TLs
thus
bridging
gap
