View of a man holding a blue light emitting diode
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View of a man holding a blue light emitting diode
Blue diode. View of a man holding the worlds first marketed blue light emitting diode (LED). He is holding the diode to his face. The only blue LEDs available before this were based on silicon carbide. These were very inefficient and did not glow very brightly. LEDs are made of two thin film layers that contain specific impurities which give them opposite electrical properties. An electric current passing through the LED will make it produce light. LEDs were developed in the 1960s but could initially only produce red or green light. In 1995 the Nichia corporation of Japan first marketed these blue LEDs
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Media ID 6437139
© VOLKER STEGER/SCIENCE PHOTO LIBRARY
Blue Device Diode Electronic Electronics First Ever Light Emitting Diode Technology Equipment
EDITORS COMMENTS
This print captures a significant milestone in the world of technology. In the frame, we see a man holding up a revolutionary blue light emitting diode (LED) to his face. This LED is no ordinary one; it is the world's first marketed blue LED, marking a breakthrough in lighting technology. Before this groundbreaking invention, blue LEDs were based on silicon carbide and proved to be highly inefficient with dim glow. However, this new innovation utilizes two thin film layers containing specific impurities that give them opposite electrical properties. When an electric current passes through these layers, they emit bright blue light. The development of LEDs dates back to the 1960s but initially only red or green light could be produced. It was not until 1995 when Japan's Nichia corporation introduced these game-changing blue LEDs to the market. This photograph showcases not only the significance of this technological advancement but also highlights its intricate construction and design. The gallium nitride used in creating these LEDs plays a crucial role in their efficiency and luminosity. Science Photo Library has beautifully captured this momentous occasion where science meets innovation. It serves as a reminder of how far we have come in harnessing light-emitting diodes for various applications across industries without mentioning any commercial use or company involved.
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