The main materials of LEDs

The LED is mainly composed of six materials: base, silver glue, chip, bond wire, epoxy resin, and phosphor.

1. LED base:
The base, also known as the LED support and LED bracket, inside the LED is used for conducting and supporting, which is generally formed by electroplating of the metal material. There are two types of LED base, that is, cup-shaped brackets and flat brackets, which are applied for concentrated-light LEDs and wide-angle LEDs respectively.

2. Sliver glue:
The role of silver glue is to immobilize the chip and conduct electricity. The proportion of the main components is 75-80% for silver powder, 10-15% for EPOXY and 5-10% for additives.

3. Chip:
The chip is a luminescent semiconductor material, generally produced by using GaP, GaAlAs, GaAs, GaN, etc., and its internal structure has unidirectional conductivity. Due to the chip can not emit white light directly, the white light LED is a mixture of a blue-light chip and a yellow phosphor.

4. Bond wire:
The bond wire is a metal wire used to connect the wafer PAD and the holder. In production, gold wires with a purity of 99.99% are generally used, its specifications are 0.9 mils, 1.0 mils, and 1.1 mils etc.

5. Epoxy resin:
The role of the epoxy resin is to protect the internal structure of the LED and slightly change the color, brightness, and beam angle.

6. Phosphor:
At present, most of the white LED light strips, LED bulbs, LED spotlights, etc. are phosphor conversion LEDs, that is, the blue light emitted by the chip is converted into white light by the corresponding phosphor. The phosphor conversion LED has a simple circuit, low production cost, and good heat dissipation, and is dominant in the current LED product market.

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