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Incandescent lights will counterattack LED under the support of LED Nanotechnology ?

  • Author:Eunice
  • Source:net
  • Release on :2016-03-05
         Shenzhen Risen OPTO Co.,LTd,led RGB light supplier in china,led outdoor lighting suppliers,led lamp fixtures supplier.From the Massachusetts Institute of Technology (MIT) and the Purdue University (Purdue University) research team claims that researchers are successfully combined with the traditional light bulb "warm appearance and energy efficiency in twenty-first Century". Although this study belongs to the field of nano photonics, but the MIT researchers think this in the lighting research results. It can also be used in other energy conversion technology.
         Researchers have developed this new structure the traditional tungsten filament in a vacuum, through external coating or around the secondary structure, able to capture visible light external radiation, and the reflection to the filament, so as to be back on the visible light absorption and then launches. These forms of photonic crystal structure with rich earth elements and traditional material deposition technique to be made only as a reflector IR wavelengths, has also become a visible light spectrum bandpass or highpass spectral filter filter. Heat return of filament, and with the increase of the temperature of the filament resistance heating current and continuous accumulation.
         The researchers pointed out that the luminous efficiency of the scheme in theory can reach 40%, but has so far made components about at about 6%. However, this is comparable to compact fluorescent lamps (compact fluorescent; CFL) and the LED lamp light source.
          According to MIT, "incandescent light, warm and familiar light is more than in first Century, in the family of applications around the world almost never change. However, as the regulations continue to improve energy efficiency goals, change is happening quickly is phasing out the old light bulbs, instead of using the more efficient compact fluorescent lamps (energy-saving light bulbs) and the new LED lamps."
          By Edison (Thomas Edison) is the development principle of the incandescent light bulb tungsten filament is heated to a temperature of about 2700 DEG C. This hot tungsten filament emits so-called blackbody radiation and, a very wide range of spectrum can provide warm light and the color of light source. However, about 95% of the energy is dissipated by heat. This is why many countries have banned or eliminated the inefficient technology. Today, researchers at MIT and the Purdue University have found ways to reverse this.
          The new research is published in the journal Nature Nanotechnology (Nanotechnology Nature). According to the researchers, the key to this study is the establishment of a two stage process. In the second step, "recycling" previously wasted energy, which allows the system to more efficiently convert electric energy into light energy. One of them is to characterize the "luminous efficiency" of the light source, which must be taken into account for the reaction of the human eye. The luminous efficiency of the traditional incandescent lamp is about 2-3%, while the fluorescent lamp (including the energy saving bulb) is 7-15%, most of the LED is between 5-15%; and the newly developed 2 stage incandescent lamp is expected to achieve up to 40% of the luminous efficiency.
          However, the research team developed the first concept validation prototype has not yet reached this ideal, but about 6.6% of the luminous efficiency. But even if this is the initial results, but also has been comparable to the current CFL and LED, but also may make incandescent bulbs to improve the luminous efficiency of 3 times.
The key to the success of the researchers is to design a kind of photonic crystal, suitable for very broad wavelength range and angle. This photonic crystal is deposited on the substrate layer stack and manufacturing.
         "When you must use the stack layer, thickness and the correct order," Professor MIT Ognjen Ilic explains, "you can very efficiently adjust the interaction between materials and light source. In the new development of the prototype system, the ideal of visible light wavelength directly through the material by lighting emitted, but infrared wavelengths will mirror like effect as to be reflected back to the filament, accumulated more heat is then converted to light. The only visible light can radiate heat, continued to rebound back to tungsten filament, until eventually become visible so far."
          In addition to outside lighting, this technique can also be used for other more applications, MIT professor Marin Soljacic said. The same approach will for energy conversion mechanism to bring "significant impact", such as thermal and optoelectronic components, the heat from external light source (chemicals, sunlight, etc.) the material luminescence, it can through photoelectric absorber the emission can be converted into electricity to light.
          Soljacic said: "to understand the basic properties of various components, such as light, heat and light energy interaction, and how to more effectively use, for a wide range of master is very important for all kinds of material. In addition, the ability to control the thermal emission is also crucial. This is the essence of the contribution of this study.
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