Photon
avalanche
(PA)
upconverting
nanoparticles
(UCNPs)
have
attracted
great
interest
because
they
can
exhibit
giant
changes
in
upconversion
luminescence
(UCL)
intensity
through
small
perturbations
of
excitation
light.
The
discovery
PA
UCNPs
opens
up
their
applications
super-resolution
imaging,
microlasers
and
optical
environmental
sensing.
These
rely
heavily
on
low
threshold
high
nonlinear
order
UCNPs.
So
far,
the
only
be
reduced
material
modification.
In
this
work,
a
strategy
is
proposed
to
reduce
required
light
source
generate
UCL
from
guided-mode
resonance
(GMR)
effect
an
optimal
resonant
waveguide
grating
(RWG)
structure.
Before
using
RWG
structure,
Tm3+-doped
NaYF4
(NaYF4:Tm3+)
core
deposited
glass
substrate
∼7.1
kW/cm2
produce
with
(n)
∼
25.9.
comparison,
when
were
coated
surface
water-covered
structure
excited
under
GMR
condition,
2.72
was
needed
induce
n
39.5.
This
strongly
enhanced
local
electric
field
formed
which
enhances
interaction
between
UCNPs,
thereby
significantly
reducing
powerfully
enhance
performance
combination
developed
into
ultrasensitive
sandwich-type
immunosensors
for
biosensing
applications.
ACS Nano,
Journal Year:
2025,
Volume and Issue:
unknown
Published: April 2, 2025
Nondestructive
and
precise
patterning
of
colloidal
semiconductor
nanocrystals
(NCs)
is
critical
in
the
fabrication
solution-processable
optoelectronic
devices.
Direct
optical
lithography
functional
inorganic
nanomaterials
(DOLFIN)
widely
used
for
high-resolution
NCs.
However,
conventional
DOLFIN
chemistry
relies
on
solvents
incompatible
with
mainstream
industrial
processes,
which
impedes
DOLFN's
widespread
adoption
as
a
universal
technology
real-world
additive
manufacturing.
In
this
work,
we
proposed
specific
criteria
ligand
design
designed
series
multifunctional
ligands
combining
methacrylate
carboxyl
groups.
Such
allowed
us
to
colloidally
stabilize
optically
pattern
NCs
i-line
h-line
light
sources
by
using
industrially
friendly
solvents.
We
showed
that
single-color
multicolor
patterns
spatial
resolution
1
μm
can
be
achieved
without
compromising
properties.
The
patterned
NC
films
photoluminescence
(PL)
electroluminescence
(EL)
par
those
unpatterned
films.
red-emitting
QLEDs
peak
external
quantum
efficiency
(EQE)
22.0%.
ability
reliably
bright
from
PGMEA
will
facilitate
an
industrialized
system-level
integration
platform
significantly
impact
production
high-resolution,
full-color
QLED
Advanced Materials,
Journal Year:
2024,
Volume and Issue:
36(35)
Published: June 27, 2024
Due
to
the
presence
of
unpaired
electron
orbitals
in
most
lanthanide
ions,
lanthanide-doped
nanoparticles
(LnNPs)
exhibit
paramagnetism.
However,
as
biosensing
applications,
magnetism
LnNPs
is
so
weak
that
can
hardly
be
employed
target
separation.
Herein,
it
discovered
highly
associated
with
their
concentration
a
confined
space,
enabling
aggregation-augmented
make
them
susceptive
conventional
magnet.
Accordingly,
magnetic
levitation
(Maglev)
sensing
system
designed,
which
exosomes
specifically
introduce
paramagnetic
microbeads'
surface,
allowing
and
further
leverage
height
Maglev
device
indicate
exosomes'
content.
It
demonstrated
this
precisely
distinguish
healthy
people's
blood
samples
from
those
breast
cancer
patients.
This
first
work
report
hold
great
promise
separation-based
biological
sample
sorting,
LnNP-permitted
proven
promising
for
establishing
new
generation
devices.
Chemical Society Reviews,
Journal Year:
2024,
Volume and Issue:
54(2), P. 983 - 1026
Published: Dec. 11, 2024
Photon
avalanche
(PA)-where
the
absorption
of
a
single
photon
initiates
'chain
reaction'
additional
and
energy
transfer
events
within
material-is
highly
nonlinear
optical
process
that
results
in
upconverted
light
emission
with
an
exceptionally
steep
dependence
on
illumination
intensity.
Over
40
years
following
first
demonstration
lanthanide-doped
bulk
crystals,
PA
has
been
achieved
nanometer-scale
colloidal
particles.
The
scaling
to
nanomaterials
resulted
significant
rapid
advances,
such
as
luminescence
imaging
beyond
diffraction
limit
light,
thermometry
force
sensing
(sub)micron
spatial
resolution,
all-optical
data
storage
processing.
In
this
review,
we
discuss
fundamental
principles
underpinning
survey
studies
leading
development
nanoscale
PA.
Finally,
offer
perspective
how
knowledge
can
be
used
for
next-generation
optimized
broad
range
applications,
including
mid-IR
imaging,
thermometry,
(bio)sensing,
processing
nanophotonics.
ACS Applied Materials & Interfaces,
Journal Year:
2024,
Volume and Issue:
16(44), P. 61083 - 61095
Published: Oct. 26, 2024
Designing
a
functional
surface
that
selectively
adsorbs
nanoparticles
based
on
their
size
and
shape
is
essential
for
developing
an
advanced
adsorption-based,
postsynthesis
nanoparticle
separation
device.
We
demonstrate
selective
adsorption
of
larger
from
solution
onto
polyelectrolyte
brush
by
tuning
the
salt
concentration.
Specifically,
positively
charged
created
converting
pyridine
groups
poly(2-vinylpyridine)
to
n-methylpyridinium
using
methyl
iodide.
The
kinetics
thermodynamics
poly(ethylene
glycol)-grafted,
negatively
gold
(diameters
12
20
nm)
were
monitored
as
function
In
salt-free
solution,
both
sizes.
As
salinity
increases,
areal
number
density
adsorbed
monotonically
decreases
becomes
negligible
at
high
salinity.
Interestingly,
there
intermediate
range
concentrations
(i.e.,
15-20
mM
NaCl)
where
decrease
in
more
pronounced
smaller
particles,
leading
size-selective
nanoparticles.
further
demonstration
selectivity,
immersed
binary
mixture
nm
found
capture
particles
with
∼90%
selectivity.
addition,
distribution
as-synthesized
nanoparticles,
average
diameter
nm,
was
reduced
removing
exposing
surfaces.
This
study
demonstrates
potential
device
remove
controlling
electrostatic
interactions
between
polymer
brushes
particles.
Photon
avalanche
(PA)
upconverting
nanoparticles
(UCNPs)
have
attracted
great
interest
because
they
can
exhibit
giant
changes
in
upconversion
luminescence
(UCL)
intensity
through
small
perturbations
of
excitation
light.
The
discovery
PA
UCNPs
opens
up
their
applications
super-resolution
imaging,
microlasers
and
optical
environmental
sensing.
These
rely
heavily
on
low
threshold
high
nonlinear
order
UCNPs.
So
far,
the
only
be
reduced
material
modification.
In
this
work,
a
strategy
is
proposed
to
reduce
required
light
source
generate
UCL
from
guided-mode
resonance
(GMR)
effect
an
optimal
resonant
waveguide
grating
(RWG)
structure.
Before
using
RWG
structure,
Tm3+-doped
NaYF4
(NaYF4:Tm3+)
core
deposited
glass
substrate
∼7.1
kW/cm2
produce
with
(n)
∼
25.9.
comparison,
when
were
coated
surface
water-covered
structure
excited
under
GMR
condition,
2.72
was
needed
induce
n
39.5.
This
strongly
enhanced
local
electric
field
formed
which
enhances
interaction
between
UCNPs,
thereby
significantly
reducing
powerfully
enhance
performance
combination
developed
into
ultrasensitive
sandwich-type
immunosensors
for
biosensing
applications.
