The vulcanization of LED refers to the process in which silver ions in the coating react with sulfur ions to form black silver sulfide after the LED lamp beads are exposed to sulfur-containing substances in the external environment. Both high temperature and high humidity will speed up the reaction.
LED vulcanization effects:
1) The lamp bead function area is black, the luminous flux is decreased, and the color temperature drifts.
2) After the silver layer in the functional area becomes silver sulfide, the contact force between the golden ball and the functional area decreases, and the lamp is easily dead.
LED vulcanization failure analysis method:
1) Although it is easy to observe the vulcanization phenomenon, each fine link in the production and application of LED lamp beads may cause sulfur pollution; the source of sulfur element is diversified, the determination process is complicated, and the influence of each factor needs to be excluded.
2) Scanning electron microscopy-energy spectroscopy (SEM-EDS) is accurate for the elemental analysis of materials, which can effectively eliminate irrelevant factors and determine the source of sulfur pollution.
case analysis:
A certain lamp factory sent a batch of LED vulcanized lamp beads, and entrusted Jinjian to find out the cause of failure. In order to find the source of sulfur, Jinjian uses SEM-EDS equipment to trace all the links that may lead to vulcanization.
・Packaging factory: materials such as brackets, phosphors, encapsulants, packaging, transportation, etc.
・Application plant: circuit board, solder, wire, glue, potting rubber, rubber mat, adhesive, etc., packaging, transportation, etc.
・Others: Auxiliary supplies (rubber gloves, cleaning agents), workshop environment, etc.
・End customer use conditions, environment
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