Supermarket case
Sourc:The SiteAddtime:2017/10/27 Click:0
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.
