LEDs: Light Emitting Diodes

Early Innovations

The journey of LED technology began with the inefficiencies of incandescent bulbs, which converted only a small fraction of electricity into visible light. Gary Arndt explains that early LEDs, developed by Oleg Lossev in 1927, were initially seen as curiosities with no practical application 1. These early LEDs emitted light in the red spectrum, which was easier to produce but not suitable for general lighting 2.

The first LEDs were some form of the color red. It was simply easier to create lower energy photons from this part of the spectrum.

--- Gary Arndt

Despite their limitations, red LEDs found use in indicator lights due to their low power consumption and durability, paving the way for further advancements in LED technology.

   

Blue LED Breakthrough

The creation of blue LEDs marked a significant milestone, enabling the production of white light by combining red, green, and blue LEDs. Gary Arndt highlights the work of Shuji Nakamura, Isamu Akasaki, and Hiroshi Amano, who were awarded the Nobel Prize for their contributions to this breakthrough 3. Blue LEDs allowed for the development of efficient white LED lighting, which has drastically improved in brightness, color quality, and cost over the years.

The brightness of LED light has improved dramatically, the color of white LED bulbs has improved, and the cost has come down.

--- Gary Arndt

This advancement not only revolutionized lighting but also set the stage for innovations in display technology, such as microLED displays, which promise better picture quality and energy efficiency.