Dalton Transactions,
Год журнала:
2022,
Номер
51(23), С. 9062 - 9071
Опубликована: Янв. 1, 2022
Non-rare-earth
Mn4+
doped
tantalate
(Sr2GdTaO6)
phosphors
exhibiting
deep-red
emission
were
synthesized.
Afterward,
the
phase
structure,
morphology,
and
optical
properties
(e.g.,
spectra,
concentration
quenching,
decay
curves,
thermal
stability,
quantum
yields,
etc.)
systematically
investigated.
Under
optimal
conditions,
Sr2GdTaO6:0.005Mn4+
phosphor
showed
an
excellent
color
purity
of
96.41%
while
chromaticity
coordinates
(0.721,
0.279).
Besides,
sample
exhibited
good
and,
hence,
it
can
be
packaged
into
light-emitting
diode
(LED)
devices.
Red-emitting
LED
devices
could
show
strong
far-red
suggested
for
plant
cultivation
lighting.
On
other
hand,
white-emitting
find
use
in
indoor
illumination.
Moreover,
with
aid
temperature-dependent
lifetime
(TDL),
a
relative
sensing
sensitivity
(1.73%
K-1
at
453
K)
luminescent
thermometer
was
established.
Herein,
all
above
findings
that
Sr2GdTaO6:Mn4+
are
potential
candidate
bifunctional
platforms
solid-state
lighting
luminescence
thermometers.
Coordination Chemistry Reviews,
Год журнала:
2022,
Номер
469, С. 214671 - 214671
Опубликована: Июнь 21, 2022
Transition
metal
(TM)
ion
activated
phosphors
are
increasingly
being
used
as
probes
for
luminescence
thermometry.
Their
is
characterized
by
strong
absorption
and
emission
bands
that
span
the
visible
near-infrared
spectral
ranges
highly
susceptible
to
temperature
variations.
Due
latter
characteristic,
sensitive
reliable
remote
measurements
can
be
performed
observing
temperature-induced
changes
in
TM
intensities,
bandwidths
bandshifts,
excited
state
lifetimes,
well
dependences
of
intensity
ratios
between
various
single
or
double
phosphors.
This
review
provides
a
systematic
analysis
performances
luminescent
thermometers
based
on
different
ions
discusses
relations
among
spectroscopic
properties,
characteristics
host
material
structure,
thermometric
performance.
Particular
attention
given
engineering
energy
transfer
other
dopant
obtain
thermometers.
Finally,
several
typical
application
examples
from
recent
literature
highlighted.
Most
lead-free
halide
double
perovskite
materials
display
low
photoluminescence
quantum
yield
(PLQY)
due
to
the
indirect
bandgap
or
forbidden
transition.
Doping
is
an
effective
strategy
tailor
optical
properties
of
materials.
Herein,
efficient
blue-emitting
Sb3+
-doped
Cs2
NaInCl6
nanocrystals
(NCs)
are
selected
as
host,
rare-earth
(RE)
ions
(Sm3+
,
Eu3+
Tb3+
and
Dy3+
)
incorporated
into
excellent
PLQY
80.1%
obtained.
Femtosecond
transient
absorption
measurement
found
that
RE
not
only
served
activator
but
also
filled
deep
vacancy
defects.
Anti-counterfeiting,
thermometry,
white-light-emitting
diodes
(WLEDs)
exhibited
using
these
ions-doped
NCs.
For
thermometry
based
on
Sm3+
:Sb3+
NCs,
maximum
relative
sensitivity
0.753%
K-1
which
higher
than
those
most
temperature-sensing
Moreover,
WLED
fabricated
by
NCs@PMMA
displays
CIE
color
coordinates
(0.30,
0.28),
a
luminous
efficiency
37.5
lm
W-1
CCT
8035
K,
CRI
over
80,
indicate
NCs
promising
single-component
phosphors
for
next-generation
lighting
technologies.
Advanced Materials,
Год журнала:
2023,
Номер
35(44)
Опубликована: Авг. 21, 2023
Abstract
Fluorescence
thermometry
has
been
propelled
to
the
forefront
of
scientific
attention
due
its
high
spatial
resolution
and
remote
non‐invasive
detection.
However,
recent
generations
thermometers
still
suffer
from
limited
thermal
sensitivity
(
S
r
)
below
10%
change
per
Kelvin.
Herein,
this
work
presents
an
ideal
temperature‐responsive
fluorescence
material
through
Te
4+
‐doped
0D
Cs
2
ScCl
5
·H
O,
in
which
isolated
polyhedrons
endow
highly
localized
electronic
structures,
strong
electron–phonon
coupling
facilitates
formation
self‐trapped
excitons
(STEs).
With
rising
temperature,
dramatic
asymmetric
expansion
soft
lattice
induces
increased
defects,
exciton–phonon
coupling,
low
activation
energy,
evokes
a
rapid
de‐trapping
process
STEs,
enabling
several
orders
magnitude
changes
lifetime
over
narrow
temperature
range.
After
regulating
with
different
doping,
record‐high
(27.36%
K
−1
lifetime‐based
detection
is
achieved
at
325
K.
The
robust
stability
against
multiple
heating/cooling
cycles
long‐term
measurements
enables
uncertainty
0.067
Further,
developed
are
demonstrated
for
local
monitoring
operating
on
internal
components.
It
believed
that
constitutes
solid
step
towards
building
next
generation
ultrasensitive
based
low‐dimensional
metal
halides.
The Journal of Physical Chemistry Letters,
Год журнала:
2022,
Номер
13(4), С. 962 - 968
Опубликована: Янв. 21, 2022
In
this
Letter,
erbium
(Er3+)
and
ytterbium
(Yb3+)
codoped
perovskite
Cs2Ag0.6Na0.4In0.9Bi0.1Cl6
microcrystal
(MC)
is
synthesized
demonstrated
systematically
to
the
most
prospective
optical
temperature
sensing
materials.
A
dual-mode
thermometry
based
on
fluorescence
intensity
ratio
lifetime
provides
a
self-reference
highly
sensitive
measurement
under
dual
wavelength
excitation
at
from
300
470
K.
Combined
with
white-light
emission
derived
self-trapped
excitons
(STEs),
characteristic
peak
of
Er3+
ions
can
be
observed
405
nm
laser
excitation.
The
(FIR)
between
used
as
temperature-dependent
probe
signal,
which
maximum
value
for
relative
absolute
sensitivities
reaches
1.40%
K-1
8.20
×
10-2
K-1.
Moreover,
luminescence
becomes
stronger
feeding
Yb3+
increasing
980
energy
transfer
revealed
by
power-dependent
photoluminescence
(PL)
spectroscopy,
involved
upconversion
mechanism
pertains
two-photon
process.
results
reveal
that
Er3+/Yb3+
lead-free
double
MC
good
candidate
thermometric
material
novel
design.
