MIT makes energy-efficient than incandescent LED




Researchers at MIT have devised a method in which thermal radiation of a filament with the aid of a nano-material is bounced back to the filament and then again to be emitted as visible light. This makes a light bulb can be more economical than an LED lamp.

MIT filament The system works with a system developed by MIT ‘photonic crystal nano’, which works for a large number of wavelengths and angles. The photonic crystal is constructed of stacked thin layers on a substrate. It allows visible wavelengths through, while reflects the infra-red wavelengths. Infrared radiation heats the filament again, allowing more heat is converted into light. Because the infrared radiation is always reflected back to the filament, again and again a portion is converted into light.

With the technique could lamps having a filament according to the team get an efficiency of up to forty percent, which would be an enormous gain with respect to the 2 to 3 percent of a conventional light bulb. During the investigation itself an efficiency of 6.6 percent was achieved. One of the researchers is to the site of the MIT compared to fluorescent light, which has an efficiency of between 7 and 15 percent. Ledverlichting nowadays has a luminous efficiency of between 5 and 15 percent.

The use of residual heat by rebound is not new and has been used before with different sensors which, for example light-sensitive cells have been processed, write the researchers in their paper in Nature Nanotechnology. The big difference with solar collectors temperature; a filament is about 2700 ° C and create a material that can withstand that temperature, is no sinecure.


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