HD8813 WS2813 Pixel LED Chip

A kind of solid-state semiconductor device, the heart of LED is a semiconductor chip, one end of the chip is attached to a bracket, one end is the negative pole, the other end is connected to the positive pole of the power supply, so that the whole chip is encapsulated by epoxy resin.

Also known as LED light-emitting chip, it is the core component of LED lamp, also known as p-n junction. Its main function is to convert electric energy into light energy, and the main material of the chip is monocrystalline silicon. Semiconductor chip is composed of two parts, one is p-type semiconductor, in which the hole is dominant, the other is n-type semiconductor, in which the electron is dominant. But when the two semiconductors are connected, a p-n junction is formed between them. When the current acts on the chip through the wire, the electrons will be pushed to the p region. In the p region, the electrons will compound with the holes, and then emit energy in the form of photons. This is the principle of LED luminescence. The wavelength of light, that is, the color of light, is determined by the material that forms the p-n junction.

The traditional LED chip adopts the front mounting structure, which is usually coated with a layer of epoxy resin and sapphire as the substrate. On the one hand, due to the poor thermal conductivity of sapphire, the heat generated by the active layer can not be released in time, and the sapphire substrate will absorb the light from the active region, even adding a metal reflector can not completely solve the problem of absorption; On the other hand, due to the poor thermal conductivity of epoxy resin, the heat can only be dissipated by the pins under the chip. Therefore, both the front and the back cause heat dissipation problems, which affect the performance and reliability of the device. In view of this, led flip chip welding technology came into being.