In the early 1960s, Nick Holonyak, an engineer who is working for General Electric, ccidentally invented the red LED light while trying to create a laser.
However, the principle that some semiconductors glowed when an electric current was applied had been known since the early 1900s, but Holonyak was the first to patent it for use as a light fixture.
Late on, for green energy reason, engineers developed the paten into today’s LED products.