LED curing method of failure analysis

Sulfide LED refers to the LED lamp bead in contact with the external environment, sulfur-containing substance in the coating of silver ions react with sulfur ions generated black silver sulfide process. High temperature and high humidity will accelerate the reaction rate. LED sulfide

1) the influence of Black lamp bead area, luminous flux decline, color temperature drift.

　　2） Functional areas after the silver layer into silver sulfide, golden and functional areas of contact force drops, easy death lamp.

LED curing method of failure analysis

1) Although easy to observe sulfide phenomenon, but the production and application of LED lamp bead every tiny link may cause sulfur pollution; Sulfur source diversity, complex decision process, the need to eliminate the influence of each factor.

　　2） Scanning electron microscopy (sem) - Spectrum analyzer ( SEM- EDS) On the material of the elemental analysis results are accurate, can effectively eliminate irrelevant factors, determine the sulfur pollution sources. Case study on

some lamps factory sent a group of LED curing light bead, entrust Jin Jian lookup failure reasons. Jin Jian to search for sulfur, the use of SEM EDS equipment back may result in every link of sulfide.

・ assembly house stents, phosphor, encapsulation adhesive materials, such as packaging, transportation, etc.

・ application factory PCB, solder, wire, plastic coated, potting glue, rubber mat, adhesive materials, packaging, transportation, etc.

・ other auxiliary equipment ( Rubber gloves, cleaning agents) , workshop environment, etc.

・ terminal customers use condition, environment

put

high LED