Eco-Light: A Leading Manufacturer of Explosion-Proof LED Lamps Shares the History of LED Development

In 1907, Henry Joseph Round first observed electroluminescence in a carbon-carbon composite material. Due to the dim emitted white light, it was not suitable for specific applications; further research was abandoned as it was challenging to integrate the carbon-carbon composite material with electroluminescence effectively.

In the late 1920s, Bernhard Gudden and Robert Wichard applied a method in France to extract phosphorescent yellow phosphorus from zinc sulfate and copper. The process was halted once again due to its dulling luster. In 1936, George Destiau published a report on zinc sulfide powder that emitted light. With the application of electrical currents and widespread understanding, the term "electroluminescence" was later introduced.

In the 1950s, British scientists invented the first LED with contemporary practical significance by applying semiconductor material gallium nitride in electroluminescence experiments, and it was introduced in the 1960s. It was said that in the early experiments, LEDs had to be placed in nitrogen vapor, and further practical operations and improvements were necessary to enable them to work efficiently at indoor temperatures. The first commercial LED was only capable of emitting infrared light that was not visible, but it was quickly applied in the magnetic induction and optical industries. By the late 1960s, the first visible red light LED was created by applying phosphide treatment on gallium nitride substrates. The modification of gallium phosphide led to higher efficiency LEDs, with brighter emitted red light, even causing the emission of orange light.

In the mid to late 1970s, gallium phosphide was used as a bright light source, emitting grayish white and green light. LEDs with two gallium phosphide cores—one bright red and the other emerald green—could produce a pale yellow light. It was at this time that Russian biologists used diamond sand to produce LEDs emitting white light. Although it was not as efficient as European LEDs, by the late 1970s, it could emit pure green light.

In the early to mid-1980s, the application of gallium nitride and aluminum phosphide paved the way for the introduction of the first high-brightness LEDs, starting with bright red, followed by pale yellow, and finally emerald green. By the early 1990s, LEDs with orange, red, yellow, and green light were produced using indium gallium phosphide. The first historically significant high-definition blue light LED also emerged in the early 1990s, once again utilizing sandstone – the obstacle in the early semiconductor light source. By today's standards, it was as dim as Russia's previous white light LED.

In the mid to late 1990s, hyperchromatic GaN LEDs emerged, followed by the production of green LEDs with high toughness and high-definition blue InGaN LEDs. Hyperchromatic blue diodes are crucial for white LEDs, as they are coated with phosphorescent material that, upon absorbing light from the deep blue diode, converts it into white light. This technology allows for the production of a wide range of visible colors. Today, the LED market features unique colors like pale green and pale pink. Readers with a scientific perspective may now realize that the development of LEDs has undergone a long and arduous process. In fact, the latest LEDs can not only emit pure ultraviolet light but also true "gray" ultraviolet light. The extent to which the LED development journey can go remains uncertain. Perhaps one day, LEDs capable of emitting X-rays will be developed. Initially, LEDs were only used for indicator lights, early computer displays, and digital wristwatches. Now, they have emerged in the hyperchromatic industry and may continue to thrive in the coming years.

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