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Why does LED chip leak electricity

popularity:Time of publication:2020-05-16


Leakage caused by pollution of LED chip

The LED chip is very small. In many cases, there are excessive dust and impurities in the air. Because the water vapor in the air may adhere to the surface of the chip, resulting in the oxidation of the LED chip and the leakage. Some trace ions can even enter into led semiconductors and damage semiconductor materials. No matter in the process of packaging, transportation, processing and storage, LED chips are easy to be polluted. We will not list them here.
Leakage caused by excessive gluing during LED packaging
In the process of LED chip packaging, there may be too much glue on the LED chip, resulting in the leakage of the LED chip. Although there is a standard for gluing, it is easy to make mistakes when it is within the scope of the standard.
Leakage caused by improper welding of LED
In the process of LED bulb production, LED chips are all produced in a large scale. In this process, there may be chip leakage due to improper welding such as faulty welding and excessive welding during the LED welding process. If the workers are not careful in the process of operation or the welding standards and inspection standards of the factory are not strict, this kind of situation is quite common.
Leakage caused by improper use of LED
When we use LED, if we use it improperly, the reverse voltage will be too high, and the PN junction of electronic components will be damaged, which may cause chip leakage.
LED chip has leakage
In this case, the leakage of LED chip itself is very rare. In the process of normal and qualified LED chip detection, it will detect whether the LED chip will leak. If the LED chip leaks, it can only be said that the LED chip is unqualified.
Chip damage causes leakage
In the process of making LED light bulb, LED chip may be damaged and leakage may occur in the process of packaging, mounting, assembly and welding.
Electrostatic problems
Static electricity is very common in life, not only between metals and electronic components, but also between buildings and hair. Sometimes when the weather is dry, there will be static electricity between our hands and objects. But this kind of friction static electricity usually produces less charge, and the static electricity is relatively weak. The other is induced static electricity, which is generally generated under the action of electric field or magnetic field. Under the action of conductor, the current in this case will be larger. Whether the static electricity damages the semiconductor components? To a certain extent, the PN junction of the semiconductor components has a certain neutralization effect on the voltage or current. However, when the voltage or current exceeds a certain range, the PN junction will eventually lose its function.
Generally speaking, the static electricity and discharge current may be instantaneous, with short duration and less discharge charge and electricity. In this case, there is basically no loss to LED chip. However, when there is induced static electricity, the discharge current may last for a long time under the action of electromagnetic field, and may cause a large loss to electronic components when there is conductor. But we don't have to worry too much. Not all static electricity will cause damage to electronic components, and static electricity will cause damage to electronic components. The precondition is to form a closed circuit, and the generation of static electricity is very small.
Leakage caused by other reasons
In addition to the possible reasons for appeal, there may be some other reasons that may lead to LED leakage, such as LED chip thermal expansion and contraction, LED package waterproof glue and other reasons.