Photoluminescence-based sensor aids light source meteorology, anti-counterfeit measures

https://www.laserfocusworld.com/detectors-imaging/article/14283738/photoluminescencebased-sensor-aids-light-source-meteorology-anticounterfeit-measures

"selectively excite either long- or short-lived emitter by tuning excitation wavelength. Exciting long-lived species produces prominent afterglow in thin film; exciting short-lived species does not... When excited, the materials show a certain photoluminescence emission spectrum that induces a unique response in our sensor... organic and ideally environmentally friendly semiconductor devices and systems"