5mm Orange Hair Orange round head LED ln-line lamp holder LED

The reliability of LED products has received increasing attention from manufacturers and users. The quality of Led Lamp Beads, which are the basic building blocks of products, directly affects the reliability of LED products. In practical applications, the failure of LED Lamp Beads often leads to abnormal functions or even complete failure of the finished product. In recent years, a series of reliability problems such as color temperature drift, lumen reduction, and poor light output caused by the discoloration of the lamp beads have been increasing, which has caused many LED product manufacturers and users to suffer serious economic losses In-line LED Lights.

1. Reasons for encapsulating glue

(1) Foreign matter remains in the encapsulant

    The appearance of the failed lamp beads showed partial discoloration and blackening. Uncovering the encapsulant, it was found that there was a black foreign matter contained in the encapsulant. The composition of the foreign matter was analyzed by scanning electron microscope and energy spectrometer (SEM&EDS) [5-6], and it was confirmed that its main components were aluminum (Al) and carbon (C). ), oxygen (O) elements, and a small amount of impurity elements. Combined with the failure background feedback from the user, it can be known that the foreign matter was introduced during the packaging process Light Emitting Diode Led.