Abstract
This
study
proposes
representative
figures
of
merit
for
circadian
and
vision
performance
healthy
efficient
use
smartphone
displays.
The
recently
developed
luminous
efficacy
radiation
(CER)
illuminance
(CIL)
related
to
human
health
rhythm
were
measured
compare
three
kinds
commercial
CIL
values
social
network
service
(SNS)
messenger
screens
from
all
displays
higher
than
41.3
biolux
(blx)
in
a
dark
room
at
night
the
highest
value
reached
50.9
blx.
These
corresponded
melatonin
suppression
(MSVs)
7.3%
11.4%,
respectively.
Moreover,
bright
had
much
MSV
(58.7
~
105.2
blx
15.4
36.1%,
respectively).
also
analyzed
nonvisual
visual
optical
properties
while
varying
distance
between
screen
eye
controlling
brightness
setting.
Finally,
method
possibly
attenuate
unhealthy
effects
was
proposed
investigated
by
decreasing
emitting
wavelength
blue
LEDs
LCD
backlight
subsequently
reducing
effect
display.
Journal of Materials Chemistry C,
Год журнала:
2016,
Номер
4(37), С. 8611 - 8623
Опубликована: Янв. 1, 2016
White
light-emitting
diodes
(WLEDs)
with
high
luminous
brightness,
low
energy
consumption,
long
lifetime
and
environmental
friendliness
can
be
applied
in
various
fields.
In
order
to
improve
the
quality
of
white
light,
red
phosphors
are
necessary.
Light Science & Applications,
Год журнала:
2016,
Номер
5(2), С. e16024 - e16024
Опубликована: Фев. 12, 2016
Single-phased,
high-color-rendering
index
(CRI)
white-light
phosphors
are
emerging
as
potential
phosphor-converted
white-light-emitting
diodes
(WLEDs)
and
an
alternative
to
blends
of
tricolor
phosphors.
However,
it
is
a
challenge
create
high
CRI
white
light
from
single-doped
activator.
Here,
we
present
(Ra
=
91)
phosphor,
Sr5(PO4)3-x(BO3)xCl:Eu2+,
composed
Sr5(PO4)3Cl
the
beginning
member
Sr5(BO3)3Cl
end
member.
This
work
utilized
solid-solution
method,
tunable
Eu2+
emission
was
achieved.
Color-tunable
emissions
in
response
structural
variation
were
observed
Sr5(PO4)3-x(BO3)xCl
solid
solutions.
further
confirmed
using
X-ray
Rietveld
refinement,
electron
paramagnetic
resonance
spectroscopy,
photoluminescence
spectra.
The
color-tunable
included
that
originated
combination
blue
Sr5(PO4)3Cl:Eu2+
induced
yellow
at
approximately
550
nm
solution.
Importantly,
showed
greater
R9
90.2
under
excitation
365
nm.
result
has
rarely
been
reported
literature
than
(R9
14.3)
commercial
Y3Al5O12:Ce3+-based
WLEDs.
These
findings
demonstrate
great
Sr5(PO4)3-x(BO3)xCl:0.04Eu2+
phosphor
for
near-UV
results
also
provide
shortcut
developing
single
Eu2+-doped
compound.
Advanced Functional Materials,
Год журнала:
2015,
Номер
25(9), С. 1463 - 1469
Опубликована: Янв. 27, 2015
A
series
of
lanthanide
metal‐organic
frameworks
(Ln‐MOFs)
are
synthesized
through
solvothermal
conditions
with
1,3‐bis(4‐carboxyphenyl)imidazolium
(H
2
L).
Owing
to
the
contraction
effect,
two
different
types
Ln‐MOFs,
namely,
{[Ln(L)
(OH)]·3H
O}
n
(Ln:Pr,
Nd,
Sm)
and
(COO)(H
O)
]·H
(Ln:
Eu,
Gd,
Tb,
Dy,
Tm,
Yb,
Y),
their
corresponding
codoped
Ln‐MOFs
Eu
x
Tb
1‐
L
obtained.
With
careful
adjustment
relative
concentration
ions
excitation
wavelength,
color
luminescence
can
be
systematically
modulated
white
light
emission
further
successfully
achieved.
Furthermore,
by
virtue
temperature‐dependent
luminescent
behavior,
0.2
0.8
allows
for
design
a
thermometer
an
excellent
linear
response
temperature
over
wide
range,
from
40
300
K.
This
work
highlights
practical
applications
tailoring
fluorescent
even
obtaining
emission,
especially
sensing
as
thermometers
in
single
framework
controlling
ways.
Journal of Materials Chemistry C,
Год журнала:
2020,
Номер
8(14), С. 4934 - 4943
Опубликована: Янв. 1, 2020
Cyan-emitting
Ca2YHf2Al3O12:xCe3+
garnet
phosphors
with
a
high
photoluminescence
quantum
efficiency
of
up
to
89.5%
were
developed
for
fabricating
color
rendering
warm-white
LEDs.
Inorganic Chemistry,
Год журнала:
2014,
Номер
53(22), С. 11985 - 11990
Опубликована: Окт. 28, 2014
A
new,
highly
efficient
deep
red-emitting
phosphor
Ca14Al10Zn6O35:Mn4+
was
developed
as
a
component
of
solid-state
white
light-emitting
diodes
(LEDs).
The
structural
and
optical
characterization
the
is
described.
exhibits
strong
emission
in
range
650–700
nm
when
excited
by
460
excitation,
with
quantum
efficiency
approaching
50%.
Concentration
dependence
Mn4+
luminescence
investigated.
Attempts
to
understand
thermal
stability
on
basis
quenching
characteristics
presented.
results
suggest
that
phosphors
deriving
from
have
potential
application
for
LEDs.
In
addition,
influence
cation
substitution
intensity
these
elucidated.
ACS Applied Materials & Interfaces,
Год журнала:
2015,
Номер
7(4), С. 2715 - 2725
Опубликована: Янв. 15, 2015
In
this
article,
Eu-activated
CaYAlO4
aluminate
phosphors
were
synthesized
by
a
solid-state
reaction.
Under
UV
light
excitation,
characteristic
red
line
emission
of
Eu3+
was
detected
in
the
range
570–650
nm.
addition,
we
introduced
crystal-site
engineering
approach
into
host
through
incorporation
Si4+–Ca2+
to
replace
Al3+–Y3+,
which
would
shrink
AlO6
octahedrons,
accompanied
expansion
CaO9
polyhedron,
and
then
enable
partial
reduction
Eu2+.
The
crystal
structure
underlying
mechanism
have
been
clarified
on
basis
Rietveld
refinement
analysis.
PL
spectra
Ca0.99+xY1–xAl1–xSixO4:Eu0.01
(x
=
0–0.30)
exhibit
both
green
Eu2+
(4f65d1–4f7,
broadband
around
503
nm)
red-orange
(5D0–7F1,2,
593
624
under
excitation
with
quantum
yield
38.5%.
CIE
coordinates
are
regularly
shifted
from
(0.482,
0.341)
(0.223,
0.457)
increasing
x,
expand
application
Eu.
Furthermore,
investigation
reveals
correlations
property
luminescent
materials,
shed
development
novel
suitable
for
lighting
display
applications.
