Q16. वर्ष 2014 में भौतिक विज्ञान में नोबेल पुरस्कार संयुक्त रूप से आकासाकी, अमानो तथा नाकामुरा को 1990 के दूशक में नीली एल ई.डी. के आविष्कार के लिए प्रदान किया गया था । इस आविष्कार ने मानव–जाति के देनंदिन जीवन को किस प्रकार प्रभावित किया है ? (250 शब्दों में उत्तर दीजिए)
Q16. The Nobel Prize in Physics of 2014 was jointly awarded to Akasaki, Amano and Nakamura for the invention of Blue LEDs in 1990s. How has this invention impacted the everyday life of human beings? (Answer in 250 words) 15
Isamu Akasaki, Hiroshi Amano and Shuji Nakamura are rewarded for inventing a new energyeffcient and environment-friendly light source – the blue light-emitting diode (LED). In the spirit of Alfred Nobel, the Prize awards an invention of greatest beneft to mankind; by using blue LEDs, white light can be created in a new way. With the advent of LED lamps we now have more long-lasting and more effcient alternatives to older light sources.
A light-emitting diode (LED) is a semiconductor device that emits light when an electric current flows through it. When current passes through an LED, the electrons recombine with holes emitting light in the process. LEDs allow the current to flow in the forward direction and block the current in the reverse direction.
How has LED’s impacted the everyday life of human beings:
- A modern white LED light blub converts more than 50 percent of the electricity it uses into light. Compare that to the 4 percent conversion rate for incandescent bulbs, and you have one efficient bulb. Besides saving money and electricity for all users, white LEDs’ efficiency makes them appealing for getting lighting to folks living in regions without electricity supply. A solar installation can charge an LED lamp to last a long time, allowing kids to do homework at night and small businesses to continue working after dark.
- LEDs also last up to 100,000 hours, compared to 10,000 hours for fluorescent lights and 1,000 hours for incandescent bulbs. Switching more houses and buildings over to LEDs could significantly reduce the world’s electricity and materials consumption for lighting.
- A white LED light is easy to make from a blue one. Engineers use a blue LED to excite some kind of fluorescent chemical in the bulb. That converts the blue light to white light.
- LEDs find applications in various fields, including optical communication, alarm and security systems, remote-controlled operations, robotics, etc. It finds usage in many areas because of its long-lasting capability, low power requirements, swift response time, and fast switching capabilities.
- Some other uses of LED’s in everyday life of humans: Used for TV back-lighting, Used in displays, Used in Automotives, LEDs used in the dimming of lights, etc.