Abstract
The
exploitation
of
borate‐based
phosphors
is
garnered
tremendous
attention
in
w
LEDs.
Although
previous
research
provided
some
insights
into
borates
from
the
viewpoints
synthesis,
structure,
and
defect
evolutions,
their
photoluminescence
(PL)
with
dopants
still
insufficient
for
actual
application,
especially
on
aspects
efficiency/stability.
Herein,
to
alleviate
above
issues,
a
new
type
lesser‐known
high
symmetry
Ba
3
Y
2
B
6
O
15
(BYB)
codoped
Dy
3+
/Eu
are
synthesized
via
multistep
solid‐state
reaction
possessed
controllable
PL
based
n
UV
excitation,
defect‐induced
(self‐)
PL,
energy
transfer
(ET)
Eu
.
origin
blue
self‐PL
clarified
oxygen‐related
defects
optimized
adjusting
synthetic
atmosphere
(air/Ar)
(co)doping
control
content.
Thanks
dense
connectivity,
highly
symmetric
structure
perfectly
ordered
octahedral
sites
accommodation
Dy/Eu
ET,
“cool”
white
red
,
respectively,
show
efficiency
narrow
full
width
at
half
maximum
(fwhm).
phosphor
also
exhibits
excellent
thermal
stability
because
bandgap
low
electron‐phonon
coupling.
Finally,
high‐quality
phosphor‐converted
LED
(pc‐
LED)
device
assembled
remote
“capping”
packaging
by
adopting
BYB:
350
nm
chip.
Advanced Materials Technologies,
Journal Year:
2025,
Volume and Issue:
unknown
Published: April 8, 2025
Abstract
In
this
study,
the
hydrothermal
method
is
used
to
prepare
CaWO
4
:
0.5
mol%
Sm
3+
phosphors
with
different
particle
sizes
using
Na
3
Cit
(Na
C
6
H
5
O
7
)
as
a
chelating
agent.
The
experimental
results
show
that
when
sodium
citrate
content
increases,
size
decreases.
temperature‐dependent
emission
spectra
of
samples
are
measured
and
found
WO
2−
luminescence
exhibits
conventional
thermal
quenching
trend,
whereas
intensity
gradually
enhances
temperature
increases.
anomalous
enhancement
phenomenon
arises
from
increased
energy
transfer
effect
Since
trends
significantly
different,
can
be
characterized
by
fluorescence
ratio
(FIR)
between
.
Through
comparison
samples,
it
relative
sensitivity
(
S
r
value
increases
maximum
values
for
4.4
µm,
1.3
63
nm
all
occur
at
303
K,
5.86%
K
−1
,
8.05%
9.26%
respectively.
summary,
nanophosphor
have
high
sensitivity,
suggesting
their
promising
application
in
sensing.
Inorganic Chemistry,
Journal Year:
2025,
Volume and Issue:
unknown
Published: April 10, 2025
Phosphors
for
white
light-emitting
diodes
(WLEDs)
would
suffer
from
inadequate
luminescent
thermal
stability,
especially
at
high
temperatures,
affecting
both
the
reliability
and
lifespan
of
devices.
Thus,
development
phosphors
with
excellent
stability
is
a
crucial
task.
By
use
high-temperature
solid-state
reaction
method,
series
Tb3+
Eu3+
codoped
NaGd2Ga3Ge2O12
(abbreviated
as
NGGGO)
has
been
successfully
synthesized.
With
an
appropriate
doping
concentration
Eu3+,
NGGGO:Tb3+,Eu3+
can
provide
color
tunable
emissions;
simultaneously,
energy
transfer
(ET)
efficiency
to
reach
nearly
100%.
Notably,
high-concentration
in
NGGGO
could
induce
oxygen
vacancies,
giving
significant
enhancement
on
luminescence.
For
NGGGO:60%
Tb3+,1.6%
phosphor,
emission
intensity
450
K
remained
even
higher
than
that
observed
under
room-temperature
conditions.
as-synthesized
phosphor
red
converter,
near-ultraviolet
pumped
WLED
device
be
fabricated.
Under
driving
current
20
mA,
exhibits
rendering
index
(CRI)
∼
89,
low
correlated
temperature
(CCT)
4603
K,
bright
light
CIE
chromaticity
coordinates
(0.3569,
0.3587),
which
demonstrates
potential
application.
Dalton Transactions,
Journal Year:
2024,
Volume and Issue:
53(38), P. 15872 - 15881
Published: Jan. 1, 2024
Nowadays,
the
development
of
phosphors
with
excellent
luminescent
thermal
stability
for
various
applications
has
become
a
research
hotspot.
Therefore,
Dy
Journal of Materials Chemistry C,
Journal Year:
2024,
Volume and Issue:
12(33), P. 12854 - 12861
Published: Jan. 1, 2024
In
this
paper,
we
propose
a
new
ratiometric
thermometric
strategy
with
high
sensitivity
enabled
by
deconstructing
the
CTB
and
Dy
3+
excitation
transitions
in
CaWO
4
:Dy
phosphors.
