Herein, a novel colorless anti-counterfeiting luminous ink composite material, to the
best of our knowledge, was prepared by incorporating upconverted
persistent luminescent
Z
n
3
G
a
2
S
n
O
8
:
1
%
C
r
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5
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Y
b
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5
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E
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(ZGSO: Cr,Yb,Er) phosphors into a
resin solution, followed by stirring. Owing to its small particle size
and uniform distribution, ZGSO: Cr, Yb, Er exhibits long-lasting,
persistent near-infrared emission at 696 nm following the stoppage of
excitation by a 274 nm ultraviolet light and a 980 nm excitation.
ZGSO: Cr, Yb, Er composites were prepared and exhibited characteristic
peaks corresponding to upconversion and an afterglow curve following
excitation at 980 nm. With various special luminescent modes, sharp
emission peaks, and emission intensity varying over time, the emission
light of composite ink is easy to detect and not easily confused.
Furthermore, the prepared composite ink can be calligraphic,
visualized, and observable, and has good light-emitting performance
following UV excitation. Our work provides a meaningful way to
fabricate multifunctional anti-counterfeiting luminous ink composites
with an intense persistent luminescence for use in anti-counterfeiting
signs, inspection imaging, and other complex industrial
applications.