When Was The First Blue Led Invented

Invented the first led that could produce visible red light.

When was the first blue led invented. Shuji nakamura 中村 修二 nakamura shūji born may 22 1954 freng is a japanese born american electronic engineer and prolific inventor specializing in the field of semiconductor technology professor at the materials department of the college of engineering university of california santa barbara ucsb and is regarded as the inventor of the blue led a major breakthrough in lighting. Visible leds in 1962 nick holonyack a consulting engineer for general electric company invented the first visible light led. Nobel prizes typically go to the people who invented technology which was patented on june 25 1974 as the first blue violet light emitting diode. Plus a little history of making semiconductors glow.

He invented these red diodes while he was employed with general electric. At the time maruska was on leave from rca laboratories where he collaborated with jacques pankove on related work. While the first two colors have been relatively easy to manufacture researchers have struggled to produce a green led. In this case it went to the people who perfected the blue led nearly two decades later.

Ironically baird and pittman only accidentally invented a light emitting diode while the pair were actually attempting to invent a laser diode. The three japanese scientists who invented the first efficient blue leds in the mid 1990s have received the 2014 nobel prize for physics. The first blue violet led using magnesium doped gallium nitride was made at stanford university in 1972 by herb maruska and wally rhines doctoral students in materials science and engineering. In 1971 the year after.

Light emitting diodes can now be made in one or in more colors. In 1962 nick holonyak jr. As a result the blue led project was canceled. Why a blue led is worth a nobel prize.

The invention of efficient blue leds was a foundational. Experimenting with the use of the semiconductor gallium arsenide that had started during the 1950s subsequently led to the development of the very first led with practical use. Shuji nakamura of nichia corporation made first blue led in 1979 but it was too expensive for commercial use until 1994. But to create a white led red blue and green light need to be combined.

This enabled a new generation of bright energy efficient white lamps as well as colour led.