AgriEngineering,
Journal Year:
2024,
Volume and Issue:
6(3), P. 3460 - 3473
Published: Sept. 19, 2024
Modern
agriculture,
with
the
use
of
artificial
lighting,
requires
high-intensity
LED
luminaires
compact
dimensions.
In
this
regard,
new
approaches
to
design
using
both
materials
and
technical
solutions
have
been
considered.
The
theoretical
evaluation
influence
different
on
efficiency
removal
thermal
energy
from
LEDs
was
shown.
A
material
PMS-5
is
proposed
evaluated
as
an
immersion
liquid,
which
can
be
used
effective
heat
sink
in
lower
part
luminaire
up
level
located
top
light
luminaires.
polymethylsiloxane
liquid
has
more
than
twice
conductivity
(0.167
W/(m·K))
HFE7200
NS15
liquids
immersion-cooled
Based
evaluation,
requirements
for
parameters,
such
metal
profile
area,
volume,
wall
thickness
external
area
cylinder,
are
highlighted
noted
parameters
a
key
role
efficient
luminaire.
It
shown
that
significantly
affects
it
necessary
specialized
profiles
optimized
diameter
cylinder.
number
designs
were
proposed,
depending
properties
construction
materials,
economic
performance,
well
actual
operating
installation
conditions.
analysis
presented
evaluations
allowed
overlay
basis
within
concept
light.
Luminescence,
Journal Year:
2025,
Volume and Issue:
40(3)
Published: Feb. 26, 2025
ABSTRACT
A
new
class
of
rare‐earth
doped
borate
phosphors,
Ba
2
Cd(BO
3
)
:
x
Eu
3+
(
=
2,
3,
4,
5,
and
6
mol%),
was
synthesized
using
the
high‐temperature
solid‐state
reaction
technique
in
air.
X‐ray
diffraction
(XRD)
confirmed
phase
formation
,
while
Fourier
transform
infrared
spectroscopy
(FT‐IR)
revealed
presence
trigonal
[BO
]
units.
The
surface
morphology
studied
field
emission
scanning
electron
microscopy
(FE‐SEM),
energy
dispersive
(EDS)
identified
elements.
Photoluminescence
(PL)
analysis
showed
that
phosphors
emitted
at
592,
613,
652,
701
nm,
corresponding
to
5
D
0
→
7
F
1
4
transition
ions,
respectively.
613
nm
red
emission,
from
transition,
strongest
for
mol%
sample.
intensity
increased
with
concentration,
peaking
mol%.
CIE
chromaticity,
correlated
color
temperature
(CCT),
purity
calculations
acceptable
coordinates
(0.6426
0.3548),
a
low
CCT
value
(2355
K),
high
(91.34%),
making
‐doped
phosphor
ideal
light
white
light‐emitting
diodes
(WLEDs).
Inorganic Chemistry,
Journal Year:
2025,
Volume and Issue:
unknown
Published: April 22, 2025
Near-infrared
(NIR)
light-emitting
diodes
(LEDs)
are
potential
devices
that
could
become
the
core
components
in
biological
imaging,
security
monitoring,
etc.,
which
currently
constrained
by
suboptimal
luminous
efficiency
due
to
absence
of
excellent
luminescent
materials.
Here,
we
report
a
double
perovskite
Cs2NaInCl6
is
suitable
for
Cr3+
doping
and
exhibits
broad
NIR
emission.
Through
direct
absorption
energy
transfer
(ET)
from
self-trapped
excitons
(STEs)
induced
matrix,
can
be
excited
4T1(P),
4T1(F),
4T2(F)
levels.
Then,
emission
with
full
width
at
half-maximum
(FWHM)
∼150
nm,
spanning
800
1300
high
photoluminescence
quantum
yield
(PLQY)
up
70%
realized,
resulting
4T2→4A2
transition
Cr3+.
Subsequently,
introduction
Yb3+
endows
Cs2NaInCl6:Cr3+,Yb3+
higher
PLQY
76%
optimal
ratio
than
Cs2NaInCl6:Cr3+.
Ultimately,
miniaturized
LED
device
packaged
based
on
Cs2NaInCl6:15%Cr3+,15%Yb3+
has
been
fabricated,
demonstrates
superior
performance
night
vision,
traceless
perspective
detection,
imaging.
This
work
not
only
screens
out
matrix
but
also
promotes
its
luminescence
through
applications.
