Applied Physics Letters,
Journal Year:
2024,
Volume and Issue:
125(22)
Published: Nov. 25, 2024
Carbon
quantum
dots
(CQDs)
hold
significant
promise
for
applications
in
biological
imaging,
sensing,
and
optoelectronic
devices
owing
to
their
superior
photostability
low
toxicity.
Nevertheless,
the
elucidation
of
photoluminescence
mechanism
remains
an
open
question,
necessitating
further
comprehensive
investigation.
In
this
Letter,
CQDs
exhibiting
ultraviolet
(UV)
white
fluorescence
were
isolated
through
silica
gel
column
chromatography
separation
crude
product
obtained
from
a
one-step
solvothermal
synthesis.
with
different
luminescent
properties
exhibit
same
crystal
structure
similar
particle
size
distributions.
Both
orthorhombic
where
C60/C70
molecules
are
located
at
lattice
points,
having
average
sizes
2.71
2.98
nm,
respectively.
Consequently,
synthesized
predominantly
governed
by
surface
structure.
The
results
microstructure
characterization
spectroscopic
analysis
demonstrate
that
UV
emission
originates
C(=O)OH
C–O–C
related
moieties
within
organic
fluorophores,
blue
band
is
attributed
defect
states
group
C–O–C,
while
green/yellow
arises
C(=O)O
levels.
These
observations
have
gained
profound
understanding
genesis
CQDs,
broadened
luminescence
coverage
wavelength
range
enriched
family
materials.
Journal of Materials Chemistry A,
Journal Year:
2024,
Volume and Issue:
12(34), P. 22417 - 22441
Published: Jan. 1, 2024
We
provide
an
overview
of
recent
advances
in
the
structure,
preparation,
and
optical
properties
various
quantum
dots
(QDs),
discuss
strategies
for
improving
electroluminescence
performance
response
to
current
challenges
QD
research.
Small Structures,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Feb. 5, 2025
Carbon
dots
are
promising
luminescent
nanostructures.
Their
availability,
based
on
inexpensive
precursors
and
their
intrinsic
fluorescent
nature,
place
them
as
potential
choices
against
traditional
quantum
in
some
applications.
However,
the
carbon
nature
is
nowadays
not
well
defined
understood.
They
usually
hybrid
nanomaterials
terms
of
structure
composition,
which
hinders
knowledge
photoluminescence
mechanisms.
Herein,
solvent‐free
pyrolysis
L
‐glutamic
acid
by
microwave
synthesis
leads
to
an
incomplete
graphitization
precursor
resulting
loose
polymer‐like
nanohybrids.
Further
experiments
confirm
that
these
(CD)
can
be
crosslinked
graphitized
a
second
heating
step
when
using
temperatures
above
160
°C,
reaching
plateau
over
200
°C.
An
exhaustive
analysis
thermogravimetric
analysis,
Raman
X‐ray
photoelectron
spectroscopy
highlights
structural
changes
undergo
from
140
where
increase
stability
observed
due
process.
The
condensation
decarboxylation
reactions
with
loss
hydrophilic
functional
groups
like
amine
carboxylic
acids
explain
formation
sp
2
domains
concomitant
solubility.
annealed
CD
exhibit
broader
slightly
red‐shifted
emission
band,
lower
yields,
compared
initial
Biosensors,
Journal Year:
2025,
Volume and Issue:
15(2), P. 105 - 105
Published: Feb. 12, 2025
Carbon
dots
(CDs)
derived
from
biomass
are
promising
fluorescent
probes
for
specific
analyte
detection
due
to
their
specificity,
biocompatibility,
selectivity,
and
sensitivity.
In
this
work,
carbon
were
prepared
hydrothermally
natural
material,
Myrica
esculenta
fruits
(hereafter
referred
as
MPCDs),
without
adding
any
chemicals.
The
MPCDs
characterized
using
optical,
microscopic,
spectroscopic
methods
that
revealed
the
presence
of
numerous
functional
groups
properties.
exhibited
exceptional
characteristics
such
water
solubility,
photostability,
excitation-dependent
fluorescence
emission,
ionic
stability.
Transmission
electron
microscopy
found
average
size
was
8
nm.
remarkable
sensing
ability
hemin,
with
a
good
linearity
(R2
=
0.999)
lower
limit
14.1
nM.
demonstrated
quenching-based
primarily
owing
ground
state
complex
formation
inner
filter
effect.
Furthermore,
material
excellent
antioxidant
potential
against
2,2'-azino-bis
(3-ethylbenzothiazoline-6-sulfonic
acid)
2,2-diphenyl-1-picrylhydrazyl
radicals
EC50
values
25.4
205.4
µg/mL,
respectively.
study
suggests
CDs
could
be
used
optical
sensors
hemin
well
scavenge
selected
radicals.
Small,
Journal Year:
2025,
Volume and Issue:
unknown
Published: May 7, 2025
Abstract
Construction
of
multicolor
emissive
PMMA
composite
films
are
reported
using
luminescent
lanthanide
Schiff‐Base
complexes
and
Terbium
doped
Graphene
Quantum
dots
(GQD@Tb)
for
white
light
generation.
Terbium‐doped
green
Dots
synthesized
hydrothermally
ortho
‐phenyldiammine
(OPDA),
Triethylamine
Tb(NO
3
)
.6H
2
O
is
thoroughly
characterized
by
microscopic
spectroscopic
techniques.
Isostructural
lanthanides
(III)
[Dy
III
(L)
(NO
(
dmf
]
1
),
[Sm
isolated
from
an
organic
Schiff
base
ligand,
H
L,
ligand
prepared
1:1
condensation
salicylaldehyde
2‐(2‐Aminoethoxy)ethanol,
characterized.
The
photoluminescent
data
analysis
reveals
emission
GQD@Tb,
pure
blue
Dy
L
red
Sm
L.
Additionally,
intensified
attests
the
emitter‐Dy
complex
while
“antenna
effect”
witnessed
fluorophore
Co‐doping
metal
GQD@Tb
into
Poly(methyl
methylacrylate)
[PMMA]
polymer
improves
luminescence
intensity
due
to
inhibition
aggregation‐induced
quenching.
By
conscientious
combination
red‐Sm
with
green‐GQD@Tb
in
a
specified
concentration,
distinct
accomplished
first
time
Commission
Internationale
de
I’Éclairage
(CIE)
values
0.29,
0.32,
very
close
ideal
emitter.
newly
developed
nano
molecular
L‐PMMA
transparent
highly
desired
materials
optoelectronics,
microscopy,
sensing.
