Advanced Materials,
Год журнала:
2022,
Номер
34(17)
Опубликована: Март 5, 2022
Carbon
dots
(CDs)
have
received
tremendous
attention
for
their
excellent
photoluminescence
(PL)
properties.
However,
it
remains
a
great
challenge
to
obtain
CDs
with
ultraviolet
(UV,
200-400
nm)
emission
in
solid
state,
which
requires
strict
control
of
the
structure
and
overcoming
aggregation-caused
quenching
(ACQ).
Herein,
new
sp3
compartmentalization
strategy
is
developed
meet
these
requirements,
by
employing
acetic
acid
promote
fractions
bonding
during
synthesis
CDs.
It
markedly
decreases
size
sp2
conjugating
units
CDs,
shifts
PL
B
(UVB)
region
(λmax
=
308
nm).
Moreover,
domains
are
well
spatially
compartmentalized
ACQ
effect
minimized,
enabling
high
quantum
yield
state
(20.2%,
λex
265
narrow
bandwidth
24
nm
environmental
robustness.
The
solid-state
UVB
emissive
highly
desired
application
photonic
devices.
Hence,
demo
light-emitting
diodes
fabricated
plant
lighting,
leading
29%
increase
ascorbic
content
basil.
Overall,
rational
efficient
way
construct
UVB-CDs
phosphors
wide
applications
provided.
Carbon
dots
(CDs),
comprising
crystalline
graphitized
carbon
cores
and
polymer
surface
groups,
are
currently
attracting
a
lot
of
interest
in
biological
fields
owing
to
their
fluorescent
properties,
high
photostability,
biocompatibility
low
toxicity.
In
addition,
the
easy
preparation
functionalization
CDs
stimulate
development
CDs‐based
composite
materials
with
specific
functions.
Presently,
applications
growing
at
remarkable
speed,
justifying
need
for
up‐to‐date
review
articles
that
capture
recent
progress
this
blossoming
field.
review,
breakthroughs
synthesis,
modification,
optical
toxicology
biocatalytic
platforms
described.
Further,
research
related
bioimaging,
biosensing,
drug
delivery,
antibacterial,
anticancer
(photothermal
therapy,
photodynamic
therapy
synergistic
therapy)
antiviral
therapies
involving
discussed
detail.
Finally,
perspective
on
prospects
challenges
biomedicine
biotechnology
is
provided.
Carbon Trends,
Год журнала:
2023,
Номер
12, С. 100276 - 100276
Опубликована: Июнь 8, 2023
Carbon
dots
(CDs)
refer
to
a
class
of
carbon-based
nanoparticles
with
various
subgroups
based
on
their
crystallinity
and
morphology.
CDs
offer
tuneable
physical,
chemical,
optical
properties,
which
can
be
controlled
using
simple
one-pot
synthesis
techniques.
In
addition,
non-toxicity,
biocompatibility,
chemical
physical
responsiveness,
resistance
photo-
chemical-bleaching
low
cost
pave
the
way
wide
range
applications.
The
achieved
via
two
approaches:
(i)
top-down
methods,
(ii)
bottom-up
methods.
These
approaches
designed
generate
intended
structures
specific
band
gap,
hetero-atom
doping,
functionality.
Further
ongoing
research
enables
us
understand
relationship
between
structural
properties
CDs.
photoluminescence
depends
parameters
including
starting
materials,
surface
states,
heteroatom
doping
etc.
Herein,
we
review
such
as
optical,
resulting
from
particles
design.
Also,
proposed
applications
biomedicine,
light
emitting
diodes,
anticounterfeiting,
sensing
are
presented,
where
main
challenges
in
strategies
overcome
these
introduced.
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
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.
