Advanced Functional Materials,
Год журнала:
2023,
Номер
33(41)
Опубликована: Июнь 13, 2023
Abstract
Carbon
dots
(CDs)—carbon
nanoparticles
smaller
than
10
nm—have
attracted
widespread
attention
owing
to
their
excellent
optical
properties.
However,
high‐performing
CDs
often
suffer
from
severe
aggregation‐induced
quenching
in
the
solid
state,
which
limits
commercial
applicability.
Therefore,
CD
materials
with
efficient
solid‐state
luminescence
are
sought.
As
research
on
structure
and
photoluminescence
mechanisms
of
has
intensified
recent
years,
strategies
construct
fluorescent
tune
emissions
have
broadened.
This
article
reviews
advances
for
attaining
fluorescence
CDs,
describes
specific
ways
properties
this
fluorescence,
introduces
latest
applications
resulting
optoelectronics,
biology,
sensing,
finally
considers
prospects
future
application
current
challenges
facing
development
CDs.
ACS Central Science,
Год журнала:
2020,
Номер
6(12), С. 2179 - 2195
Опубликована: Дек. 14, 2020
Carbon
dots
(CDs),
as
a
new
type
of
carbon-based
nanomaterial,
have
attracted
broad
research
interest
for
years,
because
their
diverse
physicochemical
properties
and
favorable
attributes
like
good
biocompatibility,
unique
optical
properties,
low
cost,
ecofriendliness,
abundant
functional
groups
(e.g.,
amino,
hydroxyl,
carboxyl),
high
stability,
electron
mobility.
In
this
Outlook,
we
comprehensively
summarize
the
classification
CDs
based
on
analysis
formation
mechanism,
micro-/nanostructure
property
features,
describe
synthetic
methods
including
strong
absorption,
photoluminescence,
phosphorescence.
Furthermore,
recent
significant
advances
in
applications,
(sensor,
anticounterfeiting),
energy
(light-emitting
diodes,
catalysis,
photovoltaics,
supercapacitors),
promising
biomedicine,
are
systematically
highlighted.
Finally,
envisage
key
issues
to
be
challenged,
future
directions,
perspectives
show
full
picture
CDs-based
materials.
Chemical Society Reviews,
Год журнала:
2021,
Номер
50(9), С. 5564 - 5589
Опубликована: Янв. 1, 2021
In
this
review,
we
summarize
recent
advances
in
establishing
persistently
luminescent
materials
from
the
view
of
examining
experimental
and
theoretical
approaches
to
room-temperature
phosphorescence
thermally-activated
delayed
fluorescence.
Advanced Materials,
Год журнала:
2021,
Номер
33(16)
Опубликована: Март 12, 2021
Abstract
The
development
of
phosphorescent
materials
with
time‐dependent
phosphorescence
colors
(TDPCs)
is
considerable
interest
for
application
in
advanced
dynamic
information
encryption.
In
this
study,
TDPC
realized
carbon
dots
(CDs)
synthesized
by
the
one‐pot
hydrothermal
treatment
levofloxacin.
CD
ink
printed
on
paper
(CD@paper)
exhibits
a
change
color
from
orange
to
green,
1
s
after
irradiation
395
nm
light.
However,
when
irradiated
wavelengths
shorter
or
longer
than
nm,
CD@paper
only
green
red
phosphorescence,
respectively.
and
originates
low‐energy
surface
oxide
triplet
state
high‐energy
N‐related
state,
When
suitable
light
energy
(around
wavelength),
two
centers
can
be
simultaneously
activated,
emitting
different
decay
rates.
merge
into
an
initially,
exhibiting
phenomenon.
Based
unusual
properties
CDs,
kind
multilevel,
colored
3D
code
designed
Nature Communications,
Год журнала:
2023,
Номер
14(1)
Опубликована: Янв. 11, 2023
Nanozymes
with
superoxide
dismutase
(SOD)-like
activity
have
attracted
increasing
interest
due
to
their
ability
scavenge
anion,
the
origin
of
most
reactive
oxygen
species
in
vivo.
However,
SOD
nanozymes
reported
thus
far
yet
approach
natural
enzymes.
Here,
we
report
a
carbon
dot
(C-dot)
nanozyme
catalytic
over
10,000
U/mg,
comparable
that
Through
selected
chemical
modifications
and
theoretical
calculations,
show
SOD-like
C-dots
relies
on
hydroxyl
carboxyl
groups
for
binding
anions
carbonyl
conjugated
π-system
electron
transfer.
Moreover,
C-dot
exhibit
intrinsic
targeting
oxidation-damaged
cells
effectively
protect
neuron
ischemic
stroke
male
mice
model.
Together,
our
study
sheds
light
structure-activity
relationship
nanozymes,
demonstrates
potential
treating
oxidation
stress
related
diseases.
Abstract
Carbon‐based
quantum
dots
(CQDs),
including
spherical
carbon
and
graphene
dots,
are
an
emerging
class
of
photoluminescent
(PL)
materials
with
unique
properties.
Great
progress
has
been
made
in
the
design
fabrication
high‐performance
CQDs,
however,
challenge
developing
solid‐state
PL
CQDs
have
aroused
great
interest
among
researchers.
A
clear
mechanism
is
basis
for
development
light
emission
also
a
prerequisite
realization
multiple
practical
applications.
However,
extremely
complex
structure
CQD
greatly
limits
understanding
CQDs.
So
far,
variety
models
proposed
to
explain
but
they
not
unified.
This
review
summarizes
current
from
perspective
energy
band
theory
electronic
transitions.
In
addition,
common
strategies
realizing
summarized.
Furthermore,
applications
fields
light‐emitting
devices,
anti‐counterfeiting,
fingerprint
detection,
etc.,
proposed.
Finally,
brief
outlook
given,
highlighting
problems,
directions
Abstract
Ultralong
room‐temperature
phosphorescence
(RTP)
is
highly
useful
for
information
encryption,
organic
electronics,
bioelectronics,
etc.
However,
the
preparation
of
related
metal‐free
materials
with
multiple
colors
across
full
spectrum
remains
a
major
challenge.
Herein,
facile
method
developed
to
fabricate
boron‐doped
carbon
dot
(B‐CD)
composites
full‐color
long
lifetime
RTP
continuously
tailorable
in
range
466–638
nm
simply
by
pyrolysis
citric
acid
and
boric
precursors
various
mass
ratios
at
different
temperatures.
This
leads
formation
luminescent
B‐CD
centers
rigid
polycrystalline
B
2
O
3
matrix,
which
effectively
stabilizes
triplet
excited
states
B‐CDs.
Thus,
become
phosphorescent
over
relatively
period
(5–12
s)
after
removal
irradiation
source.
Meanwhile,
increased
particle
size
oxidation
degree
B‐CDs
obtained
larger
feeding
or
higher
temperature
shift
from
blue
red.
Due
luminescence
centers,
can
also
be
finely
modulated
excitation
wavelength.
The
resulting
tunable
further
allow
variety
distinctive
applications
multidimensional
encryption
handily
utilizing
space,
time,
color
variations.
Single-component
multicolor
luminescence,
particularly
phosphorescence
materials
are
highly
attractive
both
in
numerous
applications
and
in-depth
understanding
the
light-emission
processes,
but
formidable
challenges
still
exist
for
preparing
such
materials.
Herein,
a
very
facile
approach
is
reported
to
synthesize
carbon
dots
(CDs)
(named
MP-CDs)
that
exhibit
fluorescence
(FL),
more
remarkably,
long-lived
room
temperature
(RTP)
under
ambient
conditions.
The
FL
RTP
colors
of
CDs
powder
observed
change
from
blue
green
cyan
yellow,
respectively,
with
excitation
wavelength
shifting
254
420
nm.
Further
studies
demonstrate
emissions
can
be
attributed
existence
multiple
emitting
centers
relatively
higher
reaction
plays
critical
role
achieving
RTP.
Given
unique
optical
properties,
preliminary
application
MP-CDs
advanced
anti-counterfeiting
presented.
This
study
not
only
proposes
strategy
prepare
photo-stimulated
materials,
also
reveals
great
potentials
exploiting
novel
properties.
Abstract
The
aggregate
luminescence
behavior
of
organic
luminescent
materials
has
been
studied
extensively.
As
a
new
kind
nanomaterials,
carbonized
polymer
dots
(CPDs)
not
only
inherit
the
stability
and
biocompatibility
carbon
materials,
but
also
possess
tunability,
water
solubility,
high
photoluminescence
quantum
yield
rendering
them
strong
candidate
for
next
generation
light‐emitting
materials.
Previously,
people
mainly
understood
its
from
perspective
some
mechanisms
are
still
unclear.
In
this
review,
we
discuss
mechanism
by
referring
to
with
emphasis
on
their
aggregation
behavior.
Firstly,
three
representative
phenomena
briefly
introduced.
Chromophores
present
in
CPDs
elaborated
further
potential
interactions
between
them,
role
crosslinked
networks.
On
basis,
special
state
summarized,
relevant
discussed
detail
consolidate
statements.
Nature Communications,
Год журнала:
2021,
Номер
12(1)
Опубликована: Май 11, 2021
The
design
of
novel
carbon
dots
with
ad
hoc
properties
requires
a
comprehensive
understanding
their
formation
mechanism,
which
is
complex
task
considering
the
number
variables
involved,
such
as
reaction
time,
structure
precursors
or
synthetic
protocol
employed.
Herein,
we
systematically
investigated
nanodots
by
tracking
structural,
chemical
and
photophysical
features
during
hydrothermal
synthesis.
We
demonstrate
that
consists
4
consecutive
steps:
(i)
aggregation
small
organic
molecules,
(ii)
dense
core
an
extended
shell,
(iii)
collapse
shell
(iv)
aromatization
core.
In
addition,
provide
examples
routes
towards
tuning
core-shell
design,
synthesizing
five
all
consist
electron-dense
covered
amine
rich
ligand
shell.
