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Incandescent lamp technology counterattack! LED Replacement Path Add Variable

2017-08-17

Since the 19th century, the birth of the traditional incandescent light bulb is a great blessing for mankind. However, the extremely low energy conversion efficiency has gradually eliminated it, and people have begun to look for more environmentally friendly alternatives. Finally, incandescent bulbs also ushered in the spring. Scientists in the United States have invented a new type of incandescent lamp, which can use its waste heat to shine again, making effective use of energy. The researchers of the new bulb say that in today's era when traditional energy-saving lamps (compact fluorescent lamps, light-emitting diode bulbs) are prevalent, if this new technology is used to the extreme, a lot of energy can be saved. Incandescent lamp through a wire (usually tungsten) hair

Incandescent lamp technology counterattack! LED Replacement Path Add Variable

Finally, incandescent bulbs also ushered in the spring. Scientists in the United States have invented a new type of incandescent lamp, which can use its waste heat to shine again, making effective use of energy.

The researchers of the new bulb say that in today's era when traditional energy-saving lamps (compact fluorescent lamps, light-emitting diode bulbs) are prevalent, if this new technology is used to the extreme, a lot of energy can be saved.

Incandescent lamps emit light by the heat of a wire (usually a tungsten filament). The heat reached nearly 2700 degrees Celsius. The high temperature causes the wire to emit visible light, but this is not the light emitted by all the heat. It also produces a lot of radiation that we can't see, such as infrared. This means that more than 95% of the energy is wasted due to heat generation.

This also explains why incandescent lamps are increasingly being replaced by more energy-efficient CFL and LED lamps. But can we find a way to use excess heat and energy to change the fate of incandescent bulbs being eliminated? This is exactly what MIT researchers are trying to solve. They invented a light bulb that can "recycle light.

There are two steps.

As a first step, they made a traditional incandescent bulb with a heating wire.

In the second step, the researchers made a mysterious device installed around the filament. The device is in the form of a photonic crystal that recycles the excess radiation produced by the filament into visible light.

The researchers' challenge was to find a material that would reflect infrared light as well as emit visible light.

One of the researchers, Ognjen Ilic, said: "The key progress in the whole process is to design a photonic structure that makes the bulb emit visible light while reflecting infrared light at a wide angle. Traditional photonic structures often have only one angle of incidence. Our challenge is to extend their optical properties to multiple angles of incidence."

The structure invented by the researchers is related to nanostructuring and can be described as natural nanotechnology. This technology makes the energy efficiency of the newly developed bulb reach 6.6 percent, which is three times higher than the 2-3% of traditional incandescent bulbs.

Although the current energy efficiency is not as high as that of CFL lamps (7-13%) or LED lamps (5-13%), the researchers believe that the technology can achieve 40% energy efficiency in the future. This means that one day we will be able to re-see incandescent bulbs on supermarket shelves.

Researchers feel that energy-saving bulbs still have a long way to go before this good wish is realized. Marin Soljačić, one of the study members, said: "Because LED lights are a strong competitor, people

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