Abstract
Developing
tunable
broadband
near‐infrared
(NIR)
fluorescent
materials
with
outstanding
luminescence
properties
and
superior
thermal
robustness
remains
a
significant
challenge
for
next‐generation
intelligent
NIR
light
sources.
Herein,
high‐performance
large‐scale
NIR‐emitting
garnet‐type
phosphor,
SrLu
2
Al
3
ScSiO
12
:Cr
3+
(SLASSO:Cr
),
is
presented.
Upon
450
nm
blue
excitation,
SLASSO:1%Cr
phosphor
yields
emission
full
width
at
half
maximum
of
108
prominent
sharp
peak
694
superimposed
on
radiation,
which
attributed
to
the
co‐occupation
Cr
ions
dominant
[AlO
6
]
octahedral
site
(Cr1
site)
subordinate
[ScO
(Cr2
site).
Remarkably,
as
⁺
content
increases,
red‐shift
in
wavelength
spanning
from
785
bandwidth
broadening
89
152
are
observed,
stems
weakening
crystal
field
strength
energy
redistribution
within
Cr1
Cr2
centers
regulated
by
formation
local
‐Cr
ion
pairs.
Notably,
optimal
sample
boasts
an
excellent
internal
quantum
efficiency
89.4%
exceptional
stability
(97.6%@423
K).
Additionally,
fabricated
phosphor‐converted
light‐emitting
diode
devices
demonstrate
promising
multi‐functional
applications,
including
plant
cultivation,
night
vision,
bioimaging
non‐destructive
detection.
