Flip chip COb LED Introduction:
What is LED flip-chip? In recent years, in the field of chips, flip-chip technology has sprung up, especially in the high-power, outdoor lighting application market. However, due to the late development, many people don’t know what LED flip chip is.
To understand the LED flip chip, we must first understand what is the LED front chip.
The LED chip is the first chip structure to appear, and it is also the chip structure commonly used in low-power chips. In this structure, the electrode is on top, and the materials from top to bottom are: P-GaN, light-emitting layer, N-GaN, and substrate. Therefore, relative to flipping is formal.
In order to prevent the electrode from occupying the light-emitting area and affect the luminous efficiency, the chip developers designed a flip-chip structure, that is, the front-mounted chip is turned upside down, so that the light excited by the light-emitting layer is directly emitted from the other side of the electrode (the substrate is finally peeled off). The chip material is transparent). At the same time, a structure that facilitates the bonding of the LED packaging factory is designed for flip-chip. Therefore, the entire chip is called a flip chip (Flip Chip), which is more commonly used in high-power chips.
