(यह छवि केवल उदाहरण के लिए बनाई गई है)
पहला व्यावहारिक दृश्य-स्पेक्ट्रम एलईडी was invented in 1962. This device, based on a Gallium Arsenide Phosphide (GaAsP) अर्धचालक substrate, emitted red light at a wavelength of approximately 650 nm. While its initial efficiency was low, it was the first LED bright enough for practical use, launching the industry of solid-state indicators and displays like those in early calculators.
Working at General Electric, Nick Holonyak Jr. successfully created the first light-emitting diode that produced light in the visible part of the spectrum, specifically red light. This was a significant advancement over previous semiconductor diodes that only emitted invisible infrared light. Holonyak’s device used a ternary मिश्र धातु, Gallium Arsenide Phosphide (GaAsP), grown on a Gallium Arsenide (GaAs) substrate. The creation of this alloy was a materials science challenge, but it allowed for a band gap large enough to produce red photons.
The invention was a proof of concept that solid-state devices could generate useful visible light. Its initial brightness was about 0.001 lumens, and it was expensive to produce. However, its robustness, small size, and low power consumption compared to incandescent bulbs made it ideal for indicator applications. This breakthrough directly led to the development of seven-segment displays that dominated the calculator and digital watch markets in the 1970s, replacing older प्रौद्योगिकियों like Nixie tubes. It marked the beginning of the transition from vacuum tube and incandescent technologies to solid-state optoelectronics.
पहला व्यावहारिक दृश्य-स्पेक्ट्रम (लाल) एलईडी
(यदि तिथि अज्ञात है या प्रासंगिक नहीं है, उदाहरण के लिए "द्रव यांत्रिकी", तो इसके उल्लेखनीय उद्भव का एक अनुमानित आंकड़ा प्रदान किया गया है)
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