NightTec, a German company dedicated to the latest advancements in “light recycling,” offers a wide array of useful glow-in-the-dark products for general consumers and businesses alike: Construction helmets, dog leashes, lampshades, wall paint, and
fasionable rave accoutrement.
As reported by EcoBuilding Pulse, NightTec believes the glow-in-the-dark technology has the potential to save a staggering 212 million megawatt-hours of electricity annually based on the estimate of future building renovations in Germany "that require illuminating materials.” That's pretty dramatic. At the very least, NightTec's somewhat eerie glowing concrete stones take the trip-and-fall-related danger out of after-hours landscaping projects.
So how exactly does this solar cell-free, afterglow-based technology work?
All NighTec® products are storing light when exposed to natural or artificial light. After this charging phase the stored light is re-emitted when the NighTec® material is exposed to darkness. This way the old light was recycled into new light and new light was emitted.
The effect of afterglow lighting is that of phosphorescence.' This is often is confused with 'fluorescence.' This term was named based on the element of 'phosphorous,' which has a natural afterglow observed by the alchemists in the 17th century and so named. The element phosphorous is not used in phosphorescence nowadays. With phosphorescence, the luminescent materials charge themselves in UV- or black light and then illuminate in the dark. In public this effect is often called 'glow in the dark.' Our luminescent materials do not contain any phosphorous either.
Via [EcoBuilding Pulse]