Advanced Optical Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Ноя. 27, 2024
Abstract
The
fluorescence
discoloration
of
carbon
dots
(CDs)
induced
by
UV
irradiation
without
chemical
modification
has
proved
to
be
difficult
achieve.
Herein,
the
synthesis
UV‐sensitive
CDs
with
photo‐induced
is
reported
using
a
heteroatom
co‐doped
hydrothermal
method
and
red‐emitting
(R‐CDs)
can
tuned
under
from
red
yellow
green,
showing
new
strategy
for
simpler
easier
modulating
luminescence
CDs.
UV‐induced
color
change
involves
changes
molecular
fluorophores
oxygen
defects
on
surface
irradiation.
Results
show
that
results
in
transformation
part
internal
groups,
such
as
C─O
CO.
Based
unique
color‐changing
property
R‐CDs,
UV‐sensing
film
fabricated,
which
expected
further
applied
field
detection.
Furthermore,
combining
fluorescent
ink
binary
code
Morse
code,
it
encrypt
decrypt
information
specific
text.
This
concept
provides
strong
technical
support
next
generation
advanced
encryption.
Gels,
Год журнала:
2024,
Номер
10(5), С. 296 - 296
Опубликована: Апрель 25, 2024
This
paper
proposes
a
new,
highly
effective
fluorescence
test
for
Cr(VI)
detection.
method
utilizes
hydrogel
composed
of
hydroxyethyl
cellulose
(HEC),
nitrogen-doped
carbon
quantum
dots
(N–CQDs),
and
poly(co-acrylamido-2-methyl-1-propane
sulfonic
acid)
(AMPS).
The
N–CQDs
were
successfully
synthesized
using
simple
microwave
method,
then
conjugated
with
HEC
AMPS.
higher
adsorption
(99.41%)
reduction
rate
in
H1
likely
stems
from
both
the
presence
(absent
HB)
their
increased
free
functional
groups
(compared
to
H2/H3,
where
block
them).
facilitates
release
(desorption)
hydrogels,
making
it
more
available
less
toxic
Cr(III).
fluorescent
brightness
HEC-N–CQDs-g-poly(AMPS)
increases
gradually
when
is
added
amounts
ranging
15
120
mg/L.
enhancement
appeared
exhibit
good
linear
relationship
15–120
mg
concentration,
detection
limit
0.0053
mg/L,
which
lower
than
standard
value
published
by
WHO.
Our
study
found
that
served
effectively
as
probe
aqueous
solutions,
demonstrating
high
sensitivity.
Advanced Optical Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Март 5, 2025
Abstract
Carbon
dots
(CDs),
as
an
emerging
fluorescent
material,
have
been
successfully
employed
in
white
laser
diode
(WLD).
However,
it
is
still
a
challenge
to
realize
single‐component
CDs‐based
phosphors
with
high
photoluminescence
thermal
stability
for
WLD.
Here,
one‐step
synthesis
of
CDs@ZIF‐8
(W‐CDs@ZIF‐8)
achieved
through
situ
heat
treatment
ZIF‐8
encapsulated
carbon
source.
Benefiting
from
the
resonance
energy
transfer
CDs
generated
inside
ZIF‐8,
W‐CDs@ZIF‐8
exhibits
ultra‐wide
full‐spectrum
emission
ranging
400
750
nm.
Because
removal
unstable
functional
groups
and
formation
rigid
structure
by
at
280
°C,
remains
unchanged
fluorescence
under
LD
irradiation
60
min
205
well
initial
decomposition
temperature
542
°C.
The
WLD
device
fabricated
phosphor
color
coordinate
(0.29,
0.32),
rendering
index
83,
correlated
8154
K,
satisfactory
stability.
This
work
provides
new
route
development
great
significance
promoting
solid‐state
lighting.
Abstract
Multicolor
carbon
dots
(CDs)
have
emerged
promising
fluorescent
nanomaterials
and
their
unique
fluorescence
properties
been
widely
studied
in
the
field
of
optoelectronics.
However,
there
are
still
great
challenges
preparing
fluorescently
tunable
multicolor
CDs
that
work
stably
visible
spectrum.
In
this
work,
were
prepared
using
low‐cost
citric
acid
urea
as
main
precursors
through
a
simple
one‐step
solvothermal
method.
Red,
green,
blue
(R‐CDs,
G‐CDs,
B‐CDs)
with
stable
optical
by
changing
solvent
to
N,
N‐dimethylformamide,
ethanol,
water,
respectively.
achieved
full
coverage
emission
wavelengths
from
short
long
wavelength,
QY
values
5.87%,
13.18%,
15.89%.
The
analysis
chemical
structure
showed
mechanism
was
mainly
attributed
C═O
content
(4.90%,
7.65%
8.26%
for
R‐CDs,
B‐CDs),
different
proportions
pyrrolic
N
(4.95%,
4.32%
3.47%
B‐CDs,
respectively)
degree
graphitization
causing
redshift
wavelength.
Finally,
based
on
polymer
matrix
luminescence
CDs,
application
light‐emitting
diodes
(LEDs)
devices
latent
fingerprint
detection
(LFP)
achieved.
ACS Applied Materials & Interfaces,
Год журнала:
2024,
Номер
16(30), С. 39470 - 39481
Опубликована: Июль 19, 2024
The
possibility
of
converting
waste
plastics
into
carbon
dots
(CDs)
with
100%
efficiencies
using
KMnO4
has
emerged
as
a
significant
discovery
in
mitigating
plastic
pollution
and
upcycling.
However,
the
lack
tunability
their
properties,
viz.
aerial
O2
harvesting,
light-induced
autophagy,
photoactivity
air
free
oxidant,
remained
bottleneck.
Besides,
toxicity
makes
process
less
sustainable.
Attempting
to
bridge
these
gaps,
herein,
we
demonstrate
preparation
CDs
polyethylene
enormous
controllability
properties
by
utilizing
less-toxic
metal-residue-free
oxidizers,
e.g.,
H2O2,
HNO3,
HClO4,
NaClO.
We
obtain
structurally
diverse
controllable
luminescent
quantum
yields
(∼0.5–8%),
excitonic
lifetimes
(1.3–2.3
ns),
binding
energies
(147–290
meV).
These
exhibit
hugely
extended
range
molecular
harvesting
(∼405–650
μM)
different
amounts
strongly
weakly
surface-bound
molecules
within
an
estimated
ratio
∼0.77–2.51.
Autophagy
varied
from
14
days
nearly
"no-autophagy"
show.
efficiently
utilized
oxygen
photocatalytic
abilities
synthesize
imine
compounds
corresponding
amines
open
(rate
constant
∼0.055
min–1),
surpassing
literature
achieved
flow
noble
metals.
Notably,
due
CDs,
no
additional
rate
enhancement
was
observed
after
purging,
establishing
role
making
excellent
oxidizing
agent.
