World's first LED lights developed from rice husks

https://techxplore.com/news/2022-04-world-rice-husks.html

"combination of milling, heat treatments, and chemical etching... extracted SiO2 powders... burning off organic compounds of milled rice... heated resulting silica powder in electric furnace to obtain Si powders via reduction reaction... purified Si powder that was further reduced to 3 nanometer in size... surface chemically functionalized for high chemical stability and high dispersivity, with 3 nm crystalline particles to produce SiQDs that luminesce in orange-red range with high luminescence efficiency over 20%"