White-light excitable NaYF4:Nd3+ for ultraviolet anti-counterfeiting applications
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Using luminescent technology for security verification holds promise for optical anti-counterfeiting. However, existing strategies often struggle in brightly lit environments due to ambient light interference. To address this issue, we introduce NaYF4:Nd3+ as a flexible platform for ultraviolet (UV) luminescence in security applications. This phosphor exhibits readily detectable upconversion luminescence under intense white-light illumination, emitting at 354 nm-a wavelength beyond the typical indoor spectrum-for background-free signal detection. Driven by a two-photon excitation mechanism with an illumination threshold of 80 mW·cm-2, UV imaging under daylight validates its reliability. This approach offers a robust, real-world solution for effective anti-counterfeiting.
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