SSRN Electronic Journal,
Journal Year:
2022,
Volume and Issue:
unknown
Published: Jan. 1, 2022
A
series
of
reddish-orange
emitting
Ca
2
InNbO
6
:Sm
3+
(CINO:Sm
)
phosphors
for
white
light-emitting
diodes
(w-LEDs)
were
synthesized
using
a
high-temperature
solid-state
technique.
The
CINO:Sm
are
pure
phases
with
monoclinic
structures.
optimal
Sm
doping
concentration
is
0.02
mol,
and
quenching
due
to
the
dipole-dipole
interaction.
Upon
407
nm
excitation,
as-prepared
exhibited
strong
emission
around
602
nm,
attributed
4
G
5/2
→
H
7/2
transition
.
Surprisingly,
revealed
an
abnormal
thermal
(ATQ)
phenomenon,
when
temperature
was
raised
380
K,
their
intensity
increased
by
more
than
15%.
CINO:0.02Sm
had
high
color
purity
(98.9%)
chromaticity
coordinates
(0.608,
0.388).
Meanwhile,
manufactured
w-LED
demonstrated
good
rendering
index
(
R
=
93),
decent
CCT
(5752
K),
Commission
International
de
l′Eclairage
(CIE)
(0.327,
0.335).
experimental
results
superiority
in
w-LEDs.
Molecules,
Journal Year:
2023,
Volume and Issue:
28(6), P. 2681 - 2681
Published: March 16, 2023
The
high-temperature
solid-phase
approach
was
used
to
synthesize
Eu3+-doped
SrMo0.5W0.5O4
phosphors,
whose
morphological
structure
and
luminescence
properties
were
then
characterized
by
XRD,
SEM,
FT-IR,
excitation
spectra,
emission
fluorescence
decay
curves.
results
reveal
that
the
best
phosphor
synthesis
temperature
900
°C
doping
of
Eu3+
charge
compensators
(K+,
Li+,
Na+,
NH4+)
had
no
effect
on
crystal
phase
change.
SrMo0.5W0.5O4:Eu3+
has
major
peaks
at
273
nm,
397
464
a
main
peak
615
making
it
potential
red
fluorescent
material
be
as
down
converter
in
UV
LEDs
(273
nm
nm)
blue
light
(464
achieve
Red
emission.
spectra
Sr1-yMo0.5W0.5O4:yEu3+(y
=
0.005,
0.01,
0.02,
0.05,
0.07)
excited
depicted,
with
concentration
increasing
intensity
first
increases
decreases,
achieves
its
maximum
when
is
1%,
critical
transfer
distance
calculated
25.57
Å.
When
various
such
K+,
NH4+
are
added
SrMo0.5W0.5O4:Eu3+,
shows
optimal
3wt%.
SrMo0.5W0.5O4:Eu3+,NH4+
color
coordinate
(0.656,0.343),
which
close
ideal
(0.670,0.333).
