Abstract: Systems, devices, and methods for authenticating a value article are provided herein. In an embodiment, a system for authenticating a value article that includes a luminescent material includes a portable computing device and an authentication device that is physically and electronically separate from the portable computing device. The portable computing device includes a microprocessor and a data receiver. The authentication device has the capacity to electronically connect with the portable computing device, and the authentication device includes an exciting light source, a photodetector, and a data transmitter. The exciting light source is provided to excite luminescent material of the value article, and the photodetector is provided to detect emitted radiation from the luminescent material after excitation.

Abstract: The production of light of various wavelengths using IR phosphor down conversion techniques using existing LED emissions to pump sensitizer-rare earth ions that emit at other wavelengths. A sensitizer absorbs an LED chip pump emission and then transfers that energy with high quantum efficiency to dopant ions that then emits at their characteristic wavelength.

Abstract: The production of light of various wavelengths using IR phosphor down conversion techniques using existing LED emissions to pump sensitizer-rare earth ions that emit at other wavelengths. A sensitizer absorbs an LED chip pump emission and then transfers that energy with high quantum efficiency to dopant ions that then emits at their characteristic wavelength.