Question: What is the principle and process of LED breakdown and damage by LED static?
LED belongs to the semiconductor components, its PN junction is directly bared outside, it is easy to be damaged by the static. When the electric charge of different polarities on the two poles of LED (induction produces the charge produced by the induction or the transferring charge) accumulated to a certain degrees, and can’t get released, once the electric charge energy exceeds over the maximum bearing capacity, the electric charge will discharge in a very short moment (ns level) between the two electrodes layer of LED, and produce the quantity of heat, and form more than 1400℃ high temperature between the conductor layer ( especially in the location of minimum resistance, peripheral electrode), high temperature will melt the conductive plane into some holes, and causes the phenomenon such as the leakage, dark bright, and death lamp, electrical moves drifting.
The static energy that breaks through LED is not the high pressure, but a kind of energy in the academic speaking. It depends on the two core coefficients, namely the quantity of the charge and the release time. The shorter of the discharge, the power is bigger, the more of the quantity of the electrode, the power is bigger. The static breakdown of LED is a very complicated process. Therefore, the board design of LED testing about antistatic is also a complicated and strict testing.
Question: What are negative effects caused by LED static breakdown and damage?
Led damaged by the static always became dead and leakage. Slight electrostatic damage will not cause any abnormality of LED. However, at the same time, LED already has certain hidden trouble, when it is damaged by the second static, it will become dark, dead and leakage.
Question: why the antistatic ability of the red and yellow LED is obviously strong?
This kind of LED chip is the single electrode structure, the material quality, thickness, backing material is different with the double electrode blue and green LED, the bearing static energy is much higher than the double electrode. Speaking from the principle of dam break, the dam of red led is thicker, the materials used are better than the double electrode; its water yield is of cause higher.
Question: why green, blue, white, and pink LED antistatic is weaker?
Most of this kind of LED core belongs to the double structure, the thickness between the two electrode planes is thinner than the single electrode, and the material is also different. Therefore, its antistatic ability is relatively weaker. Usually, the dead and leakage LED are always the blue, green and white LED.
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