The Invention Of High Efficient Blue LEDs And Future Lighting In the 1970s and 80s, a lack of suitable materials left efficient blue and green light-emitting diodes (LED) as the last missing elements for solid-state display and lighting technologies. By that time, III-nitride alloys were regarded as the least likely candidates due to various “impossible” difficulties. However, a series of unexpected breakthroughs in 1990’s totally changed peoples’ views. The first high-efficiency blue LEDs were invented and commercialized at the same time in 1993. Nowadays, III-nitride-based LEDs have become the most widely used light source in many applications. LED light bulbs have more than ten times the efficiency of incandescent bulbs, and they last for 50 years! At their current adoption rates, by 2020, LEDs can reduce the world’s need for electricity by the equivalent of nearly 60 nuclear power plants. The history of the invention of blue LED and future uses of their lighting will be described.