Since nineteenth Century, the birth of the traditional incandescent bulb has been a great boon to mankind. But very low energy conversion efficiency, it gradually eliminated, people began looking for more environmentally friendly alternatives.
Finally, the incandescent bulb came into the spring. Scientists in the United States have invented a new type of incandescent lamp that uses its own waste heat to glow again, effectively using energy.
Researchers in the new light bulb said that in the days of this traditional energy-saving lamp (compact fluorescent light, LED bulb), the new technology could save a lot of energy if it were to the full.
A light produced by heating a wire (usually tungsten filament). The heat reached nearly 2700 degrees celsius. High temperatures cause wires to emit visible light, but this is not the use of all heat. It also produces large amounts of invisible radiation, such as infrared rays. This means that more than 95% of the energy is wasted due to heat.
It also explains why incandescent lights are increasingly being replaced by more energy-efficient CFL lights and LED lights. But can we find a way to use the excess heat and energy to change the fate of an incandescent lamp being eliminated? That's what researchers at Massachusetts Institute of Technology are trying to solve. They invented a light bulb that can recycle light.
There are two steps.
In the first step, they made a traditional incandescent bulb with a hot wire.
The second step, the researchers made a mysterious device installed around the filament. The device is a photonic crystal that can recover the excess radiation produced by the filament and become visible light.
The challenge for researchers is to find a material that reflects both infrared and visible light.
One of the key advances in the whole process is the design of a photonic structure that enables the bulb to emit visible light and wide-angle reflection of infrared light, Ognjen Ilic, one of the researchers, said. Conventional photonic structures often have only one incident angle. Our challenge is to extend its optical properties to multiple incident angles."
The structure that researchers have invented is related to nanostructures and can be described as natural nanotechnology. This technology makes the initial development of the new bulb energy efficiency of 6.6%, three times higher than the traditional incandescent bulb 2-3%.
Although the current energy efficiency is not as high as CFL (7-13%) or 5-13% (LED) lights, the researchers believe that this technology will achieve 40% of the efficiency of energy utilization in the future. This means that one day we'll be able to see the incandescent bulb again on the supermarket shelves.
The researchers felt that the energy-saving light bulb had a long way to go before it could be achieved. Study on the Marin member of the Solja I C said: "because the LED lamp is a strong competitor, people