For those who read only the 'Blue LED' part from the heading -- most white light produced by LEDs is actually just Blue LED light that mixes with yellow light,

For those who read only the 'Blue LED' part from the heading -- most white light produced by LEDs is actually just Blue LED light that mixes with yellow light, produced when it passes through a phosphor layer. The first blue LED was demonstrated in 1994! The 'white' LED saw mass production only in the last decade. So a phenomenal discovery indeed that touches physics, electronics and material science, and something that will keep revolutionizing electrical lighting in the coming days.