For a long time, red and green LEDs already existed, but blue was very hard to make because it needs more energy and special crystal control. In the early 1990s, a Japanese engineer named Shuji Nakamura successfully created a bright and efficient blue LED using a material called gallium nitride, building on earlier research by Isamu Akasaki and Hiroshi Amano. This invention was very important because blue LED made it possible to create white LED light by mixing blue light with other colors, whic
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