DESIGN AND FABRICATION OF LONG PERSISTENT YELLOW AFTERGLOW IN A COMPOSITE PHOSPHOR VIA ENERGY .....

The procedure of radiative energy transfer from the exceptionally long afterglow component to the fluorescent component of the composite phosphor, followed by the colour mixing process, resulted in a high quality composite phosphor powder with yellowish-green to yellow emission and long afterglow. As a binder, the composite phosphor particles contain at least two types of phosphor particles and/or transparent epoxy/silicon resins. The excitation spectrum of the fluorescent component was overlapped as much as possible with the afterglow emission of the persistent component in the design of the composite phosphor. Depending on the quantities of the composite phosphors and the quantity of energy transfer, the composite phosphor emission spectrum can be well controlled from yellowish-green to pure yellow. Phosphor powders, ceramics, and resin composites can be used in night vision displays, emergency escape routes, and ornamental applications during energy shortages.

Please see the link :- https://www.ikprress.org/index.php/JACSI/article/view/2925