Photonic Crystal LED Blu ray technology breakthrough

In 1987, two scholars in different locations and different nationality separation, Eli Yablonovitch and Sajeev John almost at the same time found in theory, electromagnetic waves in periodic dielectric propagation in a state with the band structure, with more than two different refractive index (or dielectric constant) material periodic changes to achieve the photonic bandgap material. So the photonic crystal (Photonic Crystal) were found to have nearly 20 years later, the application is very admirable, is still a concern by developers. To avoid Nichia blue LED and fluorescent powder technology patents, all companies have invested in other to emit white light LED technology, is currently the most anticipated technology is the use of UV LED to achieve the purpose of white light, but UV LED still has light leakage and low brightness the two is not easy to overcome difficulties. In addition to continuing efforts to solve the relevant problems, had to seek other materials or techniques to achieve the white light emitting LED technology. Currently using two dimensional photonic crystals to achieve white LED technology, has been the emergence of a breakthrough, making the future of Photonic Crystal LED has become the focus of attention of the public and get rid of Nichia patent hopes. - properties of photonic crystal and photonic crystal structure with different wavelength, the structure appears on the periodic, can develop a photonic crystal dimension and two dimension and three dimension. In these structures, the most famous should belong to the three dimensional photonic crystal structure, but the three dimensional photonic crystals in the manufacture and commercialization of today's technology is very difficult. The reason is mainly the research field or in two dimensional photonic crystals, so the industry today in the field of LED are competing development of photonic crystal LED, photonic crystal is two dimensional. The construction materials is generally belongs to the fixed structure, so the material itself has the certain refractive index. Figure A is a description of the wavenumber (Wave Number) and frequency for general refractive index, the horizontal axis is the material number (Wave Number), the vertical axis is diagonal represents the frequency, refractive index. It can be seen from Figure 1 that the refractive index is very equal to the growth, that is to say, no matter what kind of wave number, what wavelength, the refractive index is certain. So photonic crystal is what kind of structure, from another angle to explain. The characteristics of photonic crystals are periodic structures, and therefore multiple reflections. Figure B said the frequency wavenumber vector number and proportion of the light of the photonic crystal can be found as a A frequency curve chart is so simple, curve has become very complex, the curve with multi direction light, is anisotropic and change, with its partial rotation it can be used to design, different products. Photonic crystal it has a very well-known characteristics, I believe we all know that it has a light gap. In the energy gap inside this area, there is no light. This curve is also the same as the slope of figure A, which is the opposite of the refractive index. At this point, the slope equals zero. So at this point, the speed of light does not produce zero. So it can be said that photonic crystals can also control the speed of light. In simple terms, the purpose of the use of photonic crystals condensed into a sentence, is to use the periodic structure, in an artificial way to control the optical properties. ^ 1: compared with the general characteristics of photonic crystal materials. - photonic crystal and solid-state light emitting component difference photonic crystal with 3 optical properties, we can use artificial way to control and achieve different purposes. First is, if the use of optical gap, can be obscured by. Using this feature, you can lock the light in a fairly narrow area. At present, the industry, there is the use of this feature to gather light in a region inside, made into an integrated circuit. Is another characteristic, is a photonic crystal with anisotropic photonic crystal, light scattering towards many directions, the reason is photonic crystal with polarizing angle of light, appear transparent and opaque (at one point it can be through, but there is no way through angle). Is third properties of photonic crystals is very complex, be the most changeful curves. Because the photonic crystal curve changes very fast, very irregular, so as long as the wavelength changes slightly, then you can see the light into the photonic crystal, it will deviate from the angle is very large. In excellence, photonic crystal area to 1/1000, smaller than the traditional integrated circuit so relatively, the accumulating degree of the circuit is increased by 1000 times than in the past. And another advantage is the discount factor reaches 1000 times the previous opticity. In addition, can also use the partial rotation, change the nature of light, can be condensed into the previous polarized square volume 1/1000. In simple terms, it has the advantages of photonic crystal and what characteristics? , a high degree of integration, two, small volume, low cost, three. - using photonic crystal to produce LED in addition, there are other characteristics of photonic crystal. Using the characteristics of the photonic crystal LED. (Figure two) is a diode made of photonic crystals. - figure two: produced by using photonic crystal L