Photo
bleaching
induced
destruction
is
one
of
the
main
challenge
for
fluorescence
organic
dyes.
Especially,
laser
dyes
are
more
fragile
to
photo
due
high
photon
density
pumping.
In
this
work,
NaYF4:Yb3+/Er3+
upconversion
micro-particles
(UCMPs)
hybrid
with
bis-squaraine
(Bis-SQ)
dye
form
a
UCMPs/Bis-SQ
composite.
The
UCMPs
excited
by
near
infrared
980
nm
an
emission
band
located
at
656
nm.
By
controlling
mass
ratio
and
Bis-SQ,
energy
emitted
from
transferred
Bis-SQ
through
förster
resonance
transfer
(FRET)
690
Lasing
observed
assistance
FRET.
No
obviously
intensity
decay
composite
after
pumping
60000
times.
This
avoid
using
as
excitation
source.
stable
enables
speckle
free
imaging
Advanced Functional Materials,
Год журнала:
2023,
Номер
33(50)
Опубликована: Авг. 17, 2023
Abstract
Large‐scale
production
of
full‐color
carbon
dots
(CDs)
at
room
temperature
under
atmospheric
pressure
will
promote
their
industrial
application.
Herein,
o‐phenylenediamine
is
used
as
a
single‐precursor
source
and
hydrogen
peroxide
an
oxidant.
Kilogram‐scale
CDs
are
obtained
by
stirring
these
reactants
in
air
for
30
min.
After
purification
acid
treatment,
blue‐,
green‐,
red‐fluorescence
with
photoluminescence
peaks
481,
539,
625
nm
quantum
yields
21.76%,
27.12%,
13.06%,
respectively.
Based
on
chemical
structural
characterizations,
reasonable
formation
mechanism
deduced,
blue,
green,
red
fluorescence
arising
from
nuclei
stacked
conjugate
planes
containing
fragments
quinoxaline,
2,3‐diaminophenazine
(2,3‐DAPN),
protonated
2,3‐DAPN,
High‐quality
multi‐color
white
light‐emitting
diodes
successfully
fabricated
to
demonstrate
potential
commercial
applications
display
illumination.
Advanced Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Сен. 13, 2024
The
combination
of
advanced
photoluminescence
characteristics
to
photochromism
is
highly
attractive
in
preparing
high-performance
multifunctional
photo-responsive
materials
for
optoelectronic
applications.
However,
this
rather
challenging
material
design
owing
the
limited
mechanism
understanding
and
construction
principles.
Here,
an
effective
strategy
integrate
afterglow
emission
carbon
dots
(CDs)
proposed
through
embedding
naphthaleneimide
(NI)
structure
CDs
followed
by
polyvinylpyrrolidone
(PVP)
encapsulation.
NI-structured
CDs-PVP
shows
intrinsic
situ
formation
NI-radical
anions
controllable
multi-stimuli-responsive
behaviors
related
oxygen-trigged
triplet
exciton
quenching
Förster
resonance
energy
transfer
(FRET)
from
pristine
photoactivated
radicals.
Notably,
a
wide
range
appearance
colors
colorless
brown,
luminescence
color
transition
blue
yellow,
much
elongated
lifetime
up
253
ms
are
observed.
With
extraordinary
stimuli-chromic
stimuli-luminescent
film
dynamically
responsive
multiple
external
stimuli,
reversible
secure
snapchat,
data
encryption/decryption
synaptic
imaging
recognition
realized.
These
findings
demonstrate
fundamental
principle
photochromic
with
afterglow,
providing
important
understandings
on
synergic
dynamic
thereby
expanding
their
applications
information
anti-counterfeiting
artificial
intelligence.
Advanced Optical Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Июль 2, 2024
Abstract
Donor–acceptor
(D–A)
structure
with
charge
transfer
(CT)
effect
is
widely
utilized
in
the
construction
of
organic
luminescent
materials.
The
adjustment
their
CT
and
related
property
usually
relies
on
changes
molecular
different
D
or
A
moieties,
which
will
lead
to
some
uncertainties
structure‐property
relationship.
With
aim
explore
clear
inherent
mechanism
for
D–A
molecule
effect,
it
ideal
that
regulation
intramolecular
one
same
can
be
realized.
Accordingly,
three
type
phosphorescence
luminogens
are
designed
synthesized.
Once
being
doped
into
polymer
matrixes,
disparate
effects
room
temperature
(RTP)
properties
achieved
a
single
molecule.
Subsequent
experiments
confirm
distributions
molecules
locally
excited
(LE)
state
mainly
responsible
distinct
RTP
behaviors,
exhibiting
well‐clarified
relationship
luminogens.
Furthermore,
transition
from
LE
even
realized
through
chemical
reaction,
leading
activated
practical
applications.
ACS Sustainable Chemistry & Engineering,
Год журнала:
2022,
Номер
11(1), С. 23 - 28
Опубликована: Дек. 29, 2022
Multicolor
solid-state
fluorescent
CDs
were
prepared
by
a
one-step
solvothermal
method
using
citric
acid
as
the
carbon
source
and
six
alkyl
amines
carbonization
solvents.
We
found
that
chain
type
of
amine
solvent
significantly
affects
interaction
between
dots
in
solid
state
thus
fluorescence
wavelength
quantum
efficiency
CDs.
Chemistry - A European Journal,
Год журнала:
2023,
Номер
29(65)
Опубликована: Сен. 8, 2023
Carbon
dots
(CDs)
smaller
than
10
nm
constitute
a
new
type
of
fluorescent
carbon-based
nanomaterial.
They
have
attracted
much
attention
owing
to
their
unique
structures
and
excellent
photoelectric
properties.
Primitive
CDs
usually
comprise
carbon
oxygen
are
synthesized
in
one
step
from
various
natural
products
or
synthetic
organic
compounds,
via
microwave
hydrothermal
methods.
However,
the
uniformity
surface
functional
groups
often
make
lack
diversity
active
sites
required
for
specific
applications.
Therefore,
functionalization
by
is
powerful
strategy
improving
photophysical
photochemical
This
paper
reviews
modification
strategies
overcome
these
shortcomings.
Functionalizing
using
covalent
non-covalent
can
give
them
properties
broaden
applicability.
Abstract
Smart
luminescent
materials
that
have
the
ability
to
reversibly
adapt
external
environmental
stimuli
and
possess
a
wide
range
of
responses
are
continually
emerging,
which
place
higher
demands
on
means
regulation
response
sites.
Here,
europium
ions
(Eu
3+
)‐directed
supramolecular
metallogels
constructed
by
orthogonal
self‐assembly
Eu
based
coordination
interactions
hydrogen
bonding.
A
new
organic
ligand
(
L
)
is
synthesized,
consisting
crown
ethers
two
flexible
amide
bonds‐linked
1,10‐phenanthroline
moieties
coordinate
with
.
Synergistic
intermolecular
bonding
in
‐
enable
self‐assemble
into
shape‐persistent
3D
MeOH
solution.
The
key
success
utilization
ethers,
playing
dual
roles
acting
both
as
building
blocks
build
C
2
‐symmetrical
structure,
ideal
monomer
for
increasing
energy
transfer
from
’s
excited
state,
thus
maintaining
excellent
luminescence
metallogels.
Interestingly,
such
assemblies
show
K
+
,
pH,
F
−
mechano‐induced
reversible
gel‐sol
transitions
tunable
properties.
Above
findings
useful
studies
molecular
switches,
dynamic
assemblies,
smart
materials.
Interdisciplinary materials,
Год журнала:
2024,
Номер
3(4), С. 453 - 479
Опубликована: Май 11, 2024
Abstract
In
recent
years,
the
precisely
controlled
synthesis
of
chiral
twisted
molecular
carbons
has
emerged
as
a
forefront
topic
in
research
carbon
materials.
Molecular
refer
to
nanomaterials
synthesized
with
precision
at
atomic
level.
Through
rational
design,
rigid
and
stable
structures
can
be
synthesized.
The
exploration
field
is
key
fully
understanding
various
configurations
materials
delving
into
relationship
between
structure
design
functionality.
This
review
explores
such
nanographene,
nanobelts,
nanosheets,
graphdiyne,
etc.
It
emphasizes
role
photocyclization,
Scholl
reaction,
Diels–Alder
reactions
achieving
precise
control
discusses
range
innovative
strategies.
These
strategies
have
led
development
structures,
helical,
propeller,
Möbius
strip
configurations.
introduction
chirality,
combined
inherent
exceptional
optical
properties
nanocarbon
materials,
facilitated
creation
superior
chiroptical
performances.
advancement
driving
applications
fields
optoelectronics
optics.
