The structure of LED lamp beads
LED lamp beads are mainly composed of five materials: bracket, silver glue, chip, gold wire and epoxy resin.
1. LED lamp bead bracket
1. The role of the bracket: conduction and support
2. The composition of the stent: the stent is formed by electroplating the stent material, which is composed of five layers of material, copper, nickel, copper and silver from the inside to the outside.
3. Types of brackets: brackets with cups are for condensing light, and flat-head brackets are for large-angle astigmatism.
2. LED lamp beads silver glue
1. The role of silver glue: fix the chip and conduct electricity.
2. The main components of silver glue: silver powder accounts for 75-80%, EPOXY (epoxy resin) accounts for 10-15%, and additives account for 5-10%.
3. The use of silver glue: refrigerate, thaw and stir well before use, because silver powder will precipitate after being placed for a long time, and the performance of silver glue will be affected if it is not stirred evenly. WeChat public account: Shenzhen LED Chamber of Commerce
3. LED lamp bead chip
1. The role of the chip: The chip is the main component of the LED Lamp, and it is a luminous semiconductor material.
2. Composition of the wafer: The wafer is composed of gallium phosphide (GaP), gallium aluminum arsenide (GaAlAs) or gallium arsenide (GaAs), gallium nitride (GaN) and other materials, and its internal structure has unidirectional conductivity.
3. The structure of the wafer: welding single wire positive polarity (P/N structure) wafer, double wire wafer. The size unit of the wafer is mil, and the pads of the wafer are generally gold pads or aluminum pads. The pad shapes are round, square, cross, etc.
4. The luminous color of the chip:
The luminous color of the wafer depends on the wavelength. Common visible light classifications are roughly: dark red (700nm), deep red (640-660nm), red (615-635nm), amber (600-610nm), yellow (580-595nm) , yellow-green (565-575nm), pure green (500-540nm), blue (450-480nm), purple (380-430nm).
White light and pink light are a mixed effect of light. The most common is a mixture of blue + yellow phosphors and blue + red phosphors.
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