Blue light-emitting diode

Blue light-emitting diode – 1972

SRI created the world’s first blue light-emitting diode (LED) using gallium nitride in 1972. Although it was too feeble for practical use, this development pre-dated high-brightness blue LEDs by almost 20 years.

Blue LEDs formed the basis for the blue laser diodes used in today’s Blu-Ray DVD players.

Read our 75th anniversary blog feature

75 Years of Innovation: LED, first blue-light emitting diode

Read more from SRI