1. UV glue curing lamp light-emitting mechanism: the terminal voltage of PN junction forms a certain barrier. When the positive bias voltage is applied, most of the carriers in the P and N regions will diffuse with each other. Because the electron mobility is much higher than the hole mobility, a large number of electrons will be distributed in the p region, which will form a small amount of carrier injection in the p region. These electrons combine with holes in the valence band, and the energy generated is released in the form of light energy. This is how the PN junction glows.

 

 

 

 

 

2. UVLED luminous efficiency: generally known as the external quantum efficiency of components, it is the product of the internal quantum efficiency of components and the extraction efficiency of components. The so-called internal quantum efficiency element is actually the electro-optic conversion efficiency of the element itself, which is mainly related to the characteristics of the element itself (such as the element material band, defects and impurities), the base composition and crystal structure of the components. Component extraction efficiency refers to the number of photons generated in the component, which can be measured outside the component after absorption, refraction and reflection of the component itself. Therefore, the factors of extraction efficiency include the absorption of the component material itself, the geometry of the component, the refractive index difference between the component and the packaging material, and the scattering characteristics of the component structure. The product of the internal quantum efficiency and the extraction efficiency of the module is the luminous effect of the whole module, that is, the external quantum efficiency of the module. The key point of early component development is to improve its internal quantum efficiency. The main means of crystal quality and crystal structure change is to improve the barrier rate, which is not easy to convert electric energy into heat energy, thus indirectly improving the luminous efficiency of UVLED, so as to obtain 70% internal quantum efficiency, but the theory of internal quantum efficiency is almost close to the theoretical limit. In this case, it is impossible to improve the total light by improving the internal quantum efficiency of the element, so improving the extraction efficiency of the element has become an important research topic. At present, the main methods are: the change of grain shape, tip structure, surface roughness technology.

 

 

 

 

 

3. UV glue curing lamp characteristics: the load characteristics of the current controller and UI curve are similar to those of the PN junction. It is a small change in the micro voltage that can cause a great change in the forward current (index level). The reverse leakage current is very small, which is the reverse breakdown voltage. In practice, it should be selected. The forward voltage of UVLED decreases with temperature and has a negative temperature coefficient. UVLED consumes power and converts part of it into light energy, which is what we need. The rest is converted into heat, which increases the temperature. The heat emitted can be expressed as.

 

 

 

 

 

4. Optical performance of UVLED: UVLED provides a half height and full width monochromatic light. As the energy gap of semiconductor decreases with the increase of temperature, the peak wavelength of its luminescence increases with the increase of temperature, that is, the spectral red shift, and the temperature coefficient is + 2-3 /. UVLED brightness L and forward current. The current increases and the brightness increases approximately. In addition, brightness is also related to ambient temperature. When the ambient temperature is high, the composite efficiency decreases and the luminous intensity decreases.

 

 

 

 

 

5. Heat dissipation characteristics of UV glue curing lamp: small current, no obvious temperature rise of LED. If the ambient temperature is high, the main wavelength will be red shifted, brightness will be reduced, uniformity and uniformity will be reduced. In particular, the temperature rise of large-scale display has a greater impact on the reliability and stability of LED. So cooling design is the key.

 

 

 

 

 

6. UVLED life: long working time can lead to aging, especially for high-power, the problem of light decay is more serious. When measuring the service life, the damage degree of the lamp tube can only be insufficient at the end of the service life of UVLED. The service life of UVLED should be specified by the percentage of light attenuation, for example, 35%, which is more meaningful.

 

 

 

 

 

 

 

7. High power: mainly consider heat dissipation and light emission. In terms of heat dissipation, the copper base heat dissipation pad is used to connect the aluminum base radiator, which can be connected by welding between the grain and the heat liner. UV glue curing lamp is a good heat dissipation method