Chemistry of Materials,
Год журнала:
2024,
Номер
36(5), С. 2483 - 2494
Опубликована: Фев. 27, 2024
Lanthanide
(Ln3+)-doped
double
perovskites
to
achieve
near-infrared
(NIR)
emission
have
been
demonstrated
be
an
effective
strategy.
However,
these
emitters
generally
exhibit
low
efficiencies,
which
limits
further
applications.
Herein,
we
synthesized
Er3+-doped
Cs2NaYCl6
via
a
hydrothermal
reaction.
Steady-state
and
transient
fluorescence
spectra
show
that
there
is
pronounced
cross-relaxation
between
neighboring
Er3+,
thus
boosting
the
NIR
with
photoluminescence
quantum
efficiency
(PLQE)
of
93
±
2%
(NIR-II
region
∼87%).
Moreover,
ferromagnetic
coupling
can
enhance
absorption
intensity
Er3+;
thus,
strongest
witnessed
direct
excitation
at
520
nm.
The
remarkable
PLQE
ideal
wavelength
make
Cs2NaYCl6:Er3+
candidate
for
next
generation
light
sources.
In
addition,
Nd3+
Yb3+
were
also
doped
in
successfully,
their
respective
values
are
51
3%
30
2%,
respectively.
Particularly,
Ln3+-doped
440
K
maintain
103%
(Er3+),
91%
(Nd3+),
112%
(Yb3+)
initial
300
K.
Their
admirable
properties
enable
us
demonstrate
application
as-synthesized
compounds
night
vision
nondestructive
testing.
Therefore,
our
findings
one
most
promising
emitters.
Advanced Materials,
Год журнала:
2022,
Номер
34(52)
Опубликована: Март 24, 2022
Abstract
Self‐trapped
excitons
(STEs)
have
recently
attracted
tremendous
interest
due
to
their
broadband
emission,
high
photoluminescence
quantum
yield,
and
self‐absorption‐free
properties,
which
enable
a
large
range
of
optoelectronic
applications
such
as
lighting,
displays,
radiation
detection,
special
sensors.
Unlike
free
excitons,
the
formation
STEs
requires
strong
coupling
between
excited
state
soft
lattice
in
low
electronic
dimensional
materials.
The
chemical
structural
diversity
metal
halides
provides
an
ideal
platform
for
developing
efficient
STE
emission
Herein,
overview
recent
progress
on
materials
is
presented.
relationships
fundamental
mechanisms,
compositions,
device
performances
are
systematically
reviewed.
On
this
basis,
currently
existing
challenges
possible
development
opportunities
field
Advanced Optical Materials,
Год журнала:
2022,
Номер
10(6)
Опубликована: Янв. 17, 2022
Abstract
Phosphor‐converted
light‐emitting
diode
(pc‐LED)
has
drawn
much
interest
due
to
the
efficient
light
in
solid‐state
lighting,
backlight
display,
security,
and
electronic
devices.
Thermal
quenching
(TQ)
induced
by
nonradiative
relaxation
is
one
of
vital
challenges
that
limits
widespread
use
phosphors.
Much
efforts
are
devoted
designing
different
approaches
solve
emission
loss
at
increasing
temperature.
Here,
mechanism
TQ
recent
advances
anti‐TQ‐phosphor‐involved
5d–4f,
4f–4f,
6p–6s,
3d–3d
transitions
discussed.
Several
important
design
strategies
for
anti‐TQ
phosphors
summarized
as
follows:
1)
defect
engineering;
2)
energy
transfer;
3)
structural
modulation;
4)
enhancing
crystallinity;
5)
layer
design;
6)
negative/zero
thermal
expansion;
7)
surface
coating
glass
technology.
Additionally,
some
future
opportunities
this
field
proposed.
This
review
promotes
discovery
novel
phosphor
materials
LED
applications.
Abstract
Lead‐free
halide
double
perovskite
(HDP)
nanocrystals
are
considered
as
one
of
the
most
promising
alternatives
to
lead
due
their
unique
characteristics
nontoxicity,
robust
intrinsic
thermodynamic
stability,
rich
and
tunable
optoelectronic
properties.
Although
lead‐free
HDP
variants
with
highly
efficient
emission
synthesized
characterized,
photoluminescent
(PL)
properties
colloidal
still
have
enormous
challenges
for
application
in
light‐emitting
diode
(LED)
devices
surface
defects,
indirect
band,
disallowable
optical
transitions.
Herein,
recent
progress
on
synthetic
strategies,
ligands
passivation,
metal
doping/alloying
boosting
efficiency
stability
is
comprehensive
summarized.
It
begins
by
introducing
crystalline
structure,
electronic
PL
mechanism
HDPs.
Next,
limiting
factors
origins
instability
analyzed,
followed
highlighting
effects
synthesis
Then,
preliminary
applications
LED
emphasized.
Finally,
prospects
concerning
development
stable
nanocrystals‐based
future
proposed.
Nanoscale Horizons,
Год журнала:
2022,
Номер
7(9), С. 941 - 1015
Опубликована: Янв. 1, 2022
Oleic
acid
and
oleylamine
are
added
in
a
solution
containing
suitable
precursors
they
can
often
form
complexes
with
metal
ions.
These
may
be
thermally
decomposed
to
yield
ligand-coated
nanoparticles
tendency
assemblies.
Angewandte Chemie International Edition,
Год журнала:
2022,
Номер
61(9)
Опубликована: Янв. 4, 2022
Luminescent
metal
halides
have
attracted
considerable
attention
in
next-generation
solid-state
lighting
because
of
their
superior
optical
properties
and
easy
solution
processibility.
Herein,
we
report
a
new
class
highly
efficient
dual-band-tunable
white-light
emitters
based
on
Bi3+
/Te4+
co-doped
perovskite
derivative
Cs2
SnCl6
microcrystals.
Owing
to
the
strong
electron-phonon
coupling
energy
transfer
from
Te4+
,
microcrystals
exhibited
broad
dual-band
emission
originating
inter-configurational
3
P0,1
→1
S0
transitions
with
good
stability
high
photoluminescence
(PL)
quantum
yield
up
68.3
%.
Specifically,
remarkable
transition
-PL
lifetime
milliseconds
at
10
K
microseconds
300
was
observed,
as
solid
evidence
for
isolated
emission.
These
findings
provide
not
only
insights
into
excited-state
dynamics
but
also
general
approach
achieve
single-composition
lead-free
through
ns2
-metal
ion
co-doping.
Angewandte Chemie International Edition,
Год журнала:
2022,
Номер
61(26)
Опубликована: Апрель 19, 2022
All-inorganic
lead-free
perovskite-derivative
metal
halides
have
shown
great
promise
in
optoelectronics,
however,
it
remains
challenging
to
realize
efficient
near-infrared
(NIR)
luminescence
these
materials.
Herein,
we
report
a
novel
strategy
based
on
Te4+
/Ln3+
(Ln=Er,
Nd,
and
Yb)
co-doping
achieve
NIR
vacancy-ordered
double
perovskite
Cs2
ZrCl6
phosphors,
which
are
excitable
by
low-cost
near-ultraviolet
light-emitting
diode
(LED)
chip.
Through
sensitization
the
spin-orbital
allowed
1
S0
→3
P1
transition
of
,
intense
multi-wavelength
originating
from
4f→4f
transitions
Er3+
Nd3+
Yb3+
was
acquired,
with
quantum
yield
6.1
%
for
emission.
These
findings
provide
general
approach
emission
through
ns2
-metal
lanthanide
ion
co-doping,
thereby
opening
up
new
avenue
exploring
NIR-emitting
derivatives
towards
versatile
applications
such
as
NIR-LEDs
bioimaging.
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.
