Luminescent inorganic photochromics have great potential applications
in 3D optical memory due to their excellent thermal stability and chemical
resistance. Nevertheless, constructing inorganic photochromics with a high
luminescence switching contrast remains challenging for optical informa
tion storage. Understanding inherent relationships between microenviron
ment changes, photophysical material properties, and rational control of
their luminescence properties are crucial to address these issues. This
paper proposes an effective strategy to significantly improve the lumines
cence switching contrast by more than 300% by site-selective occupancy
engineering on BaMgSiO
4
:Eu
2
+
photochromic materials. An effective energy
transfer process is established between luminescent and photochromic
units, which may provide new insights for designing high-performance
optical storage systems. The fabricated flexible films exhibit excellent water
proof, flexibility, and stretchability characteristics, accompanied by reversible
color switching and larger color contrast. Optical data storage can be not
only visually encoded and decoded on the flexible films by 405 and 532 nm
LED excitation, respectively. Writing, erasing, and reading strategies for flex
ible films are particularly suitable for complex application environments in
optical storage and rewritable flexible devices.
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