Researchers from Kyushu University has demonstrated the world's first glow-in-the-dark material that is made completely from organic materials. These materials can absorb light and release it slowly - with light emission lasting up to an hour.
Current solutions, used in watch hands and emergency signs, are in-organic, and also include heavy metals. In-organic GITD materials are also opaque. The new materials are transparent and much more environmental friendly, and are more cost effective as they contain only carbon based materials.