Sourc:Addtime: 2018-02-28 Click:
Is generally referred to as the external quantum efficiency of the component, which is the product of the internal quantum efficiency of the component and the efficiency of the removal of the component. The internal quantum efficiency of the so-called component is actually the electro-optical conversion efficiency of the component itself, mainly related to the characteristics of the component itself (such as the energy band of the component material, defects, impurities), the composition and structure of the components. And the efficiency of the removal of the component refers to the number of photons that can be measured outside the component after the absorption, refraction, and reflection of the photons generated inside the assembly. Therefore, the factors relating to the efficiency of the extraction include the absorption of the component material itself, the geometry of the assembly, the refractive index difference between the assembly and the encapsulating material, and the scattering characteristics of the component structure. The product of the internal quantum efficiency of the component and the efficiency of the removal of the component is the luminous effect of the entire component, that is, the external quantum efficiency of the component. The development of early components is focused on improving its internal quantum efficiency. The main method is to improve the efficiency of the LED by improving the quality of the barrier crystal and changing the structure of the barrier crystal, so that the electric energy is not easily converted into heat energy, and thus indirectly improve the luminous efficiency of the LED, which can get about 70% Internal quantum efficiency, but such internal quantum efficiency is almost close to the theoretical limit. In such a situation, it is impossible to improve the total amount of energy of the component by improving the internal quantum efficiency of the component. Therefore, it is an important research topic to improve the efficiency of the extraction of the module. The main method is: grain shape changes - TI structure, surface roughening technology.
LED fluorescent lamp
Today, the University of Georgia scientists announced that it is said to be the world's first use of a single fluorescent powder and a single light-emitting unit of warm white LED lights. The paper on the details of this information is published in the journal "Light Science and Applied" in the latest issue of the "Natural" book group.