Phosphorescent oxides and fluorescent dyes were used together to create a fiber-type illuminator that glows in the dark without the need for electric power. Dye-doped polymer fibers, which were bundled at one end, were linearly arrayed in a polysiloxane resin that contained phosphorescent oxide particles. The phosphorescent resin continued to glow for a long time even after the excitation light was removed. Organic dyes in a polymer fiber were excited by the phosphorescence and emitted fluorescence toward the fiber end. Fluorescence from a number of dyes was combined in the long fiber, and, consequently a bright light beam emerged from the fiber end. Useful performance, i.e., high power density, narrow beam divergence, and long afterglow, is demonstrated by the prototype fiber illuminator.
© 2000 Optical Society of America
(060.2380) Fiber optics and optical communications : Fiber optics sources and detectors
(150.2950) Machine vision : Illumination
(160.2540) Materials : Fluorescent and luminescent materials
(230.6080) Optical devices : Sources
(260.2510) Physical optics : Fluorescence
Mitsunori Saito and Kazuya Yamamoto, "Bright Afterglow Illuminator Made of Phosphorescent Material and Fluorescent Fibers," Appl. Opt. 39, 4366-4371 (2000)