ACS Sustainable Chemistry & Engineering,
Год журнала:
2021,
Номер
9(10), С. 3901 - 3908
Опубликована: Март 4, 2021
Since
carbon
dots
(CDs)
were
reported
in
2004,
they
have
been
widely
used
various
fields
due
to
their
outstanding
optical
properties.
However,
most
CDs
are
self-quenched
the
direct
π–π
interaction
solid-state
aggregation.
This
shortcoming
limits
wide
application
of
CDs,
because
numerous
optoelectronic
devices
and
sensors
usually
require
photoluminescent
materials
solid
state.
Therefore,
designing
preparing
with
multicolor
emission
is
necessary.
Here,
fluorescence
(SSF)
prepared
via
a
one-step
solvothermal
method,
using
MA
APTES
as
raw
materials.
Through
adjusting
ratio
materials,
emitting
green,
yellow,
orange
colors
obtained.
The
spectrum
ranges
from
490–625
nm,
QYs
34.06%,
38.07%,
20.37%,
respectively.
For
main
reason
for
that
Si–O,
Si–C,
Si–N
bonds
generated
during
formation
process
can
prevent
between
graphitized
cores.
red
shift
mechanism
liquid
attributed
decrease
particle
size
increase
degree
aggregation
within
unit
range.
In
addition,
based
on
these
excellent
photoluminescence
properties,
we
colored
light-emitting
diodes—the
CIEs
(0.22,
0.41),
(0.38,
0.47),
(0.50,
0.43)
(Commission
Internationale
de
l'Elcairage
coordinate)—and
CDs/epoxy
films
high
transparency
stability.
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.
Journal of Applied Physics,
Год журнала:
2020,
Номер
127(23)
Опубликована: Июнь 17, 2020
Luminescent
carbon
dots
(CDs)
have
received
increasing
attention
from
many
fields
during
the
past
decade.
Unfortunately,
luminescent
mechanisms
of
CDs
remain
unclear
due
to
insufficient
experimental
and
theoretical
knowledge,
which
significantly
hinders
development
with
desired
optical
properties.
Currently,
surface
states
CDs,
are
based
on
synergistic
hybridization
between
backbones
connected
functional
groups,
been
considered
as
dominant
luminescence
origins.
This
tutorial
paper,
thus,
aims
offer
an
overview
key
features
such
particle
size,
defects
heteroatom
doping,
their
influences
photoluminescence
CDs.
In
addition,
characteristics
state-derived
emissions
also
summarized.
Finally,
potential
approaches
characterizing
introduced,
followed
by
outlook
synthesizing
high-quality
through
modulation
states.
Advanced Materials,
Год журнала:
2021,
Номер
33(49)
Опубликована: Окт. 13, 2021
As
one
of
the
most
promising
fluorescent
nanomaterials,
fluorescence
carbon
dots
(CDs)
in
solution
is
extensively
studied.
Nevertheless,
synthesis
multicolor
solid-state
(SSF)
CDs
rarely
reported.
Herein,
with
aggregation-induced
emission
are
prepared
using
amine
molecules,
all
them
exhibiting
dual
at
480
nm
(Em-1)
and
580-620
(Em-2),
which
related
to
SS
bonds
dithiosalicylic
acid
conjugated
structure
attached
CO/CN
bonds,
respectively.
a
strong
electron-withdrawing
group,
increase
CN
content
makes
dual-fluorescent
groups
on
surface
produce
push
pull
electrons,
determines
intramolecular
charge
transfer
(ICT)
between
double
emission.
With
from
35.6%
58.4%,
ICT
efficiency
increases
8.71%
45.94%,
changing
green
red.
The
causes
quantum
yield
enhancement
by
nearly
five
times
redshift
peak.
Finally,
based
luminescence
properties
induced
aggregation
CDs,
pattern
encryption
white-LED
devices
realized.
Based
fat
solubility
ultraviolet
absorption
characteristics
fingerprint
detection
leaf
anti-UV
hazards
applied.
Abstract
As
a
relatively
new
type
of
fluorescent
carbon‐based
nanomaterials,
multicolor
carbon
dots
(MCDs)
have
attracted
much
attention
because
their
excellent
biocompatibility,
tunable
photoluminescence
(PL),
high
quantum
yield,
and
unique
electronic
physicochemical
properties.
The
emission
characteristics
(CDs)
obviously
depend
on
the
source
precursor,
reaction
conditions,
environment,
which
directly
or
indirectly
determines
CDs.
Therefore,
this
review
is
first
systematic
classification
summary
multiple
regulation
methods
synthetic
MCDs
reviews
recent
research
progress
in
synthesis
from
variety
precursor
materials
such
as
aromatic
molecules,
small
organic
natural
biomass,
focusing
how
different
produce
corresponding
MCDs.
This
also
introduces
innovative
applications
fields
biological
imaging,
light‐emitting
diodes
(LEDs),
sensing,
anti‐counterfeiting
due
to
PL
It
hoped
that
by
selecting
appropriate
adjustment
methods,
can
inspire
guide
future
design
tailored
MCDs,
provide
help
for
development
multifunctional
Abstract
Conventional
synthesis
of
carbon
dots
(CDs)
mostly
involves
a
hydrothermal
or
solvent‐thermal
reaction
which
needs
relatively
high
temperature
and
pressure.
In
this
work,
ionic
liquid
is
used
to
assist
in
fast
synthesizing
CDs
with
an
ultrahigh
photoluminescent
quantum
yield
(98.5%)
by
heating
at
low
(≤100
°C)
atmospheric
addition,
through
approach,
tunable
multicolor
emissive
can
be
successfully
achieved
for
preparing
high‐performance
white
light‐emitting
diodes.
Theoretical
computation
proves
that
the
activity
significantly
enhanced
liquids.
Density
functional
theory
calculation
reveals
size
graphite
nitrogen
ratios
have
effect
on
bandgap
reduction,
resulting
redshift
emission,
good
agreement
experimental
results.
This
simple
promising
approach
using
affords
facilitation
CDs‐based
luminescent
materials
manufacturing
devices.
