source:other news release time:2023-09-08 Hits: Popular:led screen wholesaler
Many of us have encountered the phenomenon of electric leakage from attached LED lamp beads. Why does it happen? In fact, the reasons for LED leakage are also different. Some are due to testing after the LED beads are packaged, some are placed for a long time, some appear after aging, and some appear after welding. What are the specific reasons for the leakage of SMD LED beads that we discussed today?
Leakage of SMD LED lamp beads caused by stress.
The thermal expansion and cold contraction of materials can generate stress. For LED beads, the thermal expansion coefficient varies depending on the material used. When the temperature changes repeatedly, various substances cannot return to their initial contact state, so a certain amount of stress will be maintained between each other.
But it may not necessarily be harmful. Only when the difference in expansion coefficients is too large and the process conditions are not suitable, will significant stress be left behind. In severe cases, it can crush the chip, causing damage to the chip, causing electrical leakage, causing some chips to open and not light up, or causing cracks in some chips. When the pressure is not very high, sometimes serious consequences can occur.
Originally, there were hanging bonds on the side of the SMD LED lamp beads. Due to the effect of stress, the surface atoms underwent slight displacement, and the electric field of these hanging bonds was in an unbalanced state, resulting in a change in the energy level state at the PN junction on the end face, resulting in leakage.
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