ACS Applied Materials & Interfaces,
Год журнала:
2024,
Номер
17(1), С. 1980 - 1991
Опубликована: Дек. 26, 2024
Developing
hybrid
fluorescence
(FL)/room-temperature
phosphorescent
(RTP)
materials
in
dry-state,
aqueous,
and
organic
solvents
holds
paramount
importance
broadening
their
applications.
However,
it
is
extremely
challenging
due
to
dissolved
oxygen
solvent-assisted
relaxation
causing
RTP
quenching
an
aqueous
environment
great
dependence
on
SiO2-based
materials.
Herein,
efficient
endogenetic
carbon
dot
(CD)
strategy
within
melamine-formaldehyde
(MF)
microspheres
activate
of
CDs
has
been
proposed
through
the
pyrolysis
isophthalic
acid
(IPA)
molecules
branched-chain
intra-microspheres.
The
formation
mechanism
CDs@MF
from
with
a
branched
chain
systematically
studied.
Detailed
investigations
revealed
that
MF
strongly
construct
covalent
hydrogen-bonded
interfacial
connections,
coupled
protection
provided
by
microsphere
shell,
greatly
suppressing
nonradiative
decay
CDs,
resulting
yellow
or
orange
duration
about
7
s
visible
naked
eye,
even
environments.
Three
samples
glowed
bright
white
light
stemming
FL/RTP
dual-mode
emission
quantum
yield
29%–36%
were
successfully
applied
single
CD-based
LEDs
tunable
color
temperature.
Additionally,
for
water-resistant
advanced
anticounterfeiting
time-dependent
information
encryption
also
demonstrated.
It
effective
multifunctional
solvent-resistant
CD
strategy.
Light Science & Applications,
Год журнала:
2024,
Номер
13(1)
Опубликована: Окт. 10, 2024
Materials
capable
of
dynamic
persistent
luminescence
(PersL)
within
the
visible
spectrum
are
highly
sought
after
for
applications
in
display,
biosensing,
and
information
security.
However,
PersL
materials
with
eye-detectable
excitation-wavelength-dependent
characteristics
rarely
achieved.
Herein,
a
nonstoichiometric
compound
CaGa
Room-temperature
phosphorescent
(RTP)
carbon
dots
(CDs)
demonstrate
significant
potential
applications
in
the
field
of
information
anticounterfeiting
due
to
their
excellent
optical
properties.
However,
RTP
emission
CDs
remains
significantly
limited
spin-forbidden
properties
triplet
exciton
transitions.
In
this
work,
an
situ
nitrogen
doping
strategy
was
employed
design
and
construct
strong
spin–orbit
coupling
nitrogen-doped
with
mesoporous
silica
alumina
(N-CDs@MS@Al2O3)
composites.
Both
experimental
results
theoretical
calculations
confirmed
that
formation
1(n,
π*)
following
introduction
breaks
restriction
from
1(π,
3(π,
π*),
thereby
enhancing
coupling,
which
further
promotes
intersystem
crossing
leads
effective
population
excitons.
The
designed
N-CDs@MS@Al2O3
benefiting
impressive
long
lifetime
3.18
s
demonstrates
application
prospects
multilevel
encryption.
This
work
provides
a
new
concept
boost
CDs.
Langmuir,
Год журнала:
2024,
Номер
40(42), С. 22409 - 22416
Опубликована: Окт. 8, 2024
The
phenomenon
of
multicolor
afterglow
emission
has
attracted
considerable
attention
in
information
encryption,
bioimaging,
and
sensing.
Consequently,
there
is
a
growing
demand
for
the
development
phosphorescence
switching
methods
utilizing
carbon
dot
(CD)
materials.
Herein,
room-temperature
(RTP)
CD-based
materials
(PM-CD@BA
composite)
was
achieved
by
developing
multiple
centers
tuning
excitation
wavelength.
color
observed
this
composite
covered
from
deep-blue
to
green
region.
experimental
results
reveal
that
under
heating
treatment,
CDs
embedded
inorganic
boric
acid/B
Angewandte Chemie,
Год журнала:
2024,
Номер
unknown
Опубликована: Ноя. 19, 2024
Abstract
Matrix
immobilization
has
been
proven
to
be
a
favored
method
for
enhancing
the
phosphorescence
of
carbon
dots
(CDs),
however,
it
remains
significant
challenge
realize
time‐dependent
colors
(TDPC)
by
embedding
CDs
with
single
emission
center.
In
this
study,
we
present
novel
matrix‐controlling
strategy
regulate
microenvironment
doping
limited
Mn
2+
in
zeolite.
The
surrounding
environment
influences
surface
state
CDs,
leading
formation
different
excitons.
At
low
temperatures,
Mn‐coordinated
(C‐CDs)
show
fast‐decaying
green
phosphorescence,
while
non‐coordinated
(NC‐CDs)
exhibit
inherent
slow‐decaying
blue
phosphorescence.
Notably,
energy
transfer
occurs
between
NC‐CDs
and
produce
an
ultrafast‐decaying
red
intensity
component
increasing
as
temperature
rises.
interplay
these
luminescent
centers
distinct
decay
rates
activates
fascinating
multi‐mode
TDPC
behavior
changes,
resulting
dynamic
afterglow
evolutions
from
at
298
K,
orange
273
cyan
77
K.
Leveraging
diverse
luminescence
CDs@MnAPO‐5,
multi‐dimensional
color
pattern
was
developed
advanced
anti‐counterfeiting
applications.
Angewandte Chemie International Edition,
Год журнала:
2024,
Номер
unknown
Опубликована: Ноя. 19, 2024
Abstract
Matrix
immobilization
has
been
proven
to
be
a
favored
method
for
enhancing
the
phosphorescence
of
carbon
dots
(CDs),
however,
it
remains
significant
challenge
realize
time‐dependent
colors
(TDPC)
by
embedding
CDs
with
single
emission
center.
In
this
study,
we
present
novel
matrix‐controlling
strategy
regulate
microenvironment
doping
limited
Mn
2+
in
zeolite.
The
surrounding
environment
influences
surface
state
CDs,
leading
formation
different
excitons.
At
low
temperatures,
Mn‐coordinated
(C‐CDs)
show
fast‐decaying
green
phosphorescence,
while
non‐coordinated
(NC‐CDs)
exhibit
inherent
slow‐decaying
blue
phosphorescence.
Notably,
energy
transfer
occurs
between
NC‐CDs
and
produce
an
ultrafast‐decaying
red
intensity
component
increasing
as
temperature
rises.
interplay
these
luminescent
centers
distinct
decay
rates
activates
fascinating
multi‐mode
TDPC
behavior
changes,
resulting
dynamic
afterglow
evolutions
from
at
298
K,
orange
273
cyan
77
K.
Leveraging
diverse
luminescence
CDs@MnAPO‐5,
multi‐dimensional
color
pattern
was
developed
advanced
anti‐counterfeiting
applications.
ACS Applied Materials & Interfaces,
Год журнала:
2025,
Номер
17(9), С. 14425 - 14432
Опубликована: Фев. 20, 2025
Room
temperature
phosphorescence
(RTP)
materials
have
attracted
considerable
attention,
because
of
their
outstanding
properties
and
a
wide
array
potential
applications.
However,
achieving
control
over
the
emission
color
RTP
still
presents
certain
challenges.
In
this
article,
carbon
dots
(CDs)
three
distinct
colors
were
synthesized
through
simple
host-guest
doping
strategy.
Blue
CDs
(B-CDs)
obtained
by
using
phenylboronic
acid
as
guest
phosphors
B2O3
host
protect
matrix,
an
ultralong
lifetime
(up
to
1.597
s).
Under
254
nm
light
excitation,
blue
for
14
s
B-CDs
can
be
visually
observed.
By
increasing
conjugation
degree
precursor
molecules
introducing
4-(1-naphthyl)
naphthalene-1-boronic
pyren-1-ylboronic
phosphors,
green
(G-CDs)
red
(R-CDs)
obtained,
respectively.
Theoretical
calculations
band
gap
analyses
suggest
that
larger
conjugated
structures
reduce
HOMO-LUMO
energy
level
difference,
thereby
causing
redshift
in
wavelength.
Last,
these
multicolor
composite
applied
information
encryption.
Carbon
dots
(CDs)
with
circularly
polarized
long
afterglow
(CPLA)
properties
have
received
increasing
attention
as
a
cutting-edge
research
field.
However,
because
the
CDs
both
and
chirality
are
difficult
to
prepare
color
of
most
phosphorescent
is
mainly
concentrated
in
short
wavelengths,
it
still
formidable
challenge
explore
facile
route
achieve
intrinsic
CD-based
color-tunable
CPLA
materials
on
large
scale.
Herein,
we
developed
gram-scale
synthesis
method
via
simple
hydrothermal
mixture
boric
acid,
arginine,
various
fluorescent
dyes.
The
tunable
successfully
achieved
by
engineering
situ
phosphorescence
resonance
energy
transfer
(PRET)
between
formed
carbonization
arginine
some
dyes
those
uncarbonized
Finally,
applications
CD
composites
multimode
advanced
anti-counterfeiting
information
encryption
were
explored.
