Six Reasons For LED Lamp Bead Color Change
Sep 17, 2018
In the LED light guide plate, the light bar is the most commonly used light source, but the light box and the light plate are discolored during use, as long as it is for what reason? Today, Xiaobian will share with you the reasons that affect the discoloration of LED lamp beads.
The structure of the light box mainly includes: lead, bracket, encapsulant, bonding wire, LED chip, solid crystal glue and phosphor. LED lamp bead color failure is closely related to its material composition, structure, packaging process and use conditions.
Encapsulation reason
1 Residual foreign matter in the encapsulant
The appearance of the failed lamp bead is partially discolored and blackened, mainly because it is introduced during the packaging process.
2 The encapsulant is chemically eroded to cause colloidal discoloration
Phosphor sedimentation
After the lamp bead is assembled into an LED lamp, it is stored in the warehouse. If it is stored for too long, phosphor deposition will occur, resulting in dispersion due to inconsistent light refraction patterns, resulting in color temperature drift and lamp bead discoloration.
Cause of bracket
1 foreign body pollution bracket
2 stent corrosion
3 bracket plating quality is poor
