Abstract: Physical authentication devices and systems using such devices may be provided. A device may include a first substrate having first and second surfaces, and an NFC circuit coupled to the first substrate. The NFC circuit may be configured to transmit first information. The device may include a transparent second substrate coupled to the first surface. The device may include a plurality of rare earth phosphors positioned in or on the substrate, such as within the transparent second substrate or between the first substrate and the transparent second substrate. Each rare earth phosphor may be configured to emit at least one wavelength of light when irradiated with an irradiating wavelength of light, the irradiating wavelength being different from the at least one wavelength of light. In some embodiments, a magnet may be coupled to the second surface. In some embodiments, the transparent second substrate may be adhered to the first substrate.