{"id":373,"date":"2021-04-09T18:00:23","date_gmt":"2021-04-09T17:00:23","guid":{"rendered":"https:\/\/tempblog.m0tei.co.uk\/?p=373"},"modified":"2021-04-09T18:00:23","modified_gmt":"2021-04-09T17:00:23","slug":"remote-phosphors","status":"publish","type":"post","link":"https:\/\/nothinguntoward.eu\/?p=373","title":{"rendered":"Remote Phosphors"},"content":{"rendered":"\n

I became aware of remote phosphors recently through a video on laser headlights<\/a> by mikeselectricstuff where he shows a piece of remote phosphor in passing at about 5 minutes in. I’d never seen this material before and it got me interested in having a play around with it.<\/p>\n\n\n\n

For a bit of background, there’s not really any such thing as a white LED. LEDs are essentially monochromatic as a result of the quantum mechanics which underpins their operation, which makes producing white light with an LED alone essentially impossible. One way around this is to use a red, green and blue LED in combination but by far the most common way to produce white light from LEDs is to use a blue LED and a yellow phosphor: the phosphor absorbs some of the blue light and re-emits is as various longer wavelengths, which appear as yellow. The combination of blue and yellow appears as white. The phosphor is typically embedded within the package of the LED. <\/p>\n\n\n\n