Acta Physica Sinica,
Journal Year:
2024,
Volume and Issue:
0(0), P. 0 - 0
Published: Jan. 1, 2024
White
LEDs
have
a
broad
application
prospects
and
market
demand,
while
the
red
phosphor
play
big
impact
on
color
temperature
rendering
index
of
modulated
white
light.
In
this
paper,
series
Li<sub>2</sub>Gd<sub>4-<i>x</i></sub>Sm<sub><i>x</i></sub>(MoO<sub>4</sub>)<sub>7</sub>(<i>x</i>=0.01-0.13)
phosphors
were
prepared
by
high
solid
phase
method.
The
successful
doping
Sm<sup>3+</sup>
into
Li<sub>2</sub>Gd<sub>4</sub>(MoO<sub>4</sub>)<sub>7</sub>
was
confirmed
X-ray
diffractometry
(XRD)
did
not
result
in
any
change
crystal
structure.
samples
detected
scanning
electron
microscope
(SEM)
as
irregular
blocky
structures
with
particle
size
less
than
20μm.
presence
Li,
Gd,
Mo,
O
Sm
elements
energy
dispersive
spectroscopy
(EDS).
photoelectron
(XPS)
studies
showed
that
activator
successfully
doped
materials.
Under
406
nm
excitation,
emission
peaks
sample
are
located
at
563,
598,
645
706nm
respectively,
which
caused
4<i>f</i>-4<i>f</i>
transition
Sm<sup>3+</sup>and
strongest
peak
comes
from
<sup>4</sup>G<sub>5/2</sub>→<sup>6</sup>H<sub>9/2</sub>
transition.
It
found
optimal
concentration
is
0.07.
With
increase
concentration,
fluorescence
lifetime
decreases
gradually.
temperature-dependent
also
studied.
intensity
473
K
still
79%
298
K,
indicating
had
excellent
heat
resistance.
CIE
chromaticity
diagram
shows
luminescence
orange-red
region
purity
(99%).
Moreover,
LED
manufactured
using
optical
phosphor,
has
coordinates
(0.3788,
0.3134)
circle
Research
Li<sub>2</sub>Gd<sub>4</sub>(MoO<sub>4</sub>)<sub>7</sub>:
promising
for
LEDs.
ACS Applied Optical Materials,
Journal Year:
2024,
Volume and Issue:
2(6), P. 1094 - 1116
Published: June 6, 2024
This
study
explores
surface
modifications
on
Er3+-activated
La2Zr2O7
nanophosphors
(NPs)
through
solution
combustion,
revealing
a
narrower
band
gap
(3.1
eV)
in
surface-modified
NPs.
Under
UV
excitation
(378
nm),
these
emit
green
light
at
550
nm,
notably
enhanced
by
oleic
acid
(OA)
modification,
offering
the
potential
for
white
light-emitting
diode
applications.
Due
to
energy
transfer
processes,
OA-modified
NPs
show
98.6%
color
purity
and
improved
quantum
efficiency
(68.7%).
Additionally,
exhibit
promise
UV-based
forensic
research
also
showcases
YOLOv8
algorithm's
robustness
(mAP@50
of
0.78
bifurcation,
0.72
ridge-end)
fingerprint
detection,
aiding
forensics.
The
deep
learning
method
supports
feature-matching
detection
advanced
identification
techniques.
These
findings
offer
insights
into
nanophosphor
modification's
optical
impact
methods,
contributing
lighting
technology
