https://www.sri.com/75-years-of-innovation/75-years-of-innovation-led-first-blue-light-emitting-diode/
75 Years of Innovation: LED, first blue-light emitting diode - SRI
Feb 5, 2025 - How SRI helped the LED get it's blue glow and increased energy efficiency and a way to create white light.
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https://www.sri.com/hoi/blue-light-emitting-diode/
Blue light-emitting diode - SRI
May 28, 2024 - SRI created the world’s first blue light-emitting diode (LED) using gallium nitride in 1972.
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https://www.build-electronic-circuits.com/what-is-an-led/
What is a Light-Emitting Diode (LED)?
Mar 7, 2024 - What is a light-emitting diode (LED) and how does it work? Learn the science, how to wire up LEDs, and much more in this beginner's tutorial.
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https://www.gsmarena.com/glossary.php3?term=led
LED (Light-Emitting Diode) - definition - GSMArena.com
What is LED (Light-Emitting Diode)?
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