The structure of LED in-line lamp beads
We know that LED in-line lamp beads (in-line LED light-emitting diodes) are composed of five materials: bracket, silver glue, chip, gold wire and epoxy resin. Today, let's analyze, what role these 5 materials play in composing LED in-line lamp beads, and how various materials are composed.
1. Bracket
1.1 The role of the bracket: used to conduct electricity and support the entire LED lamp bead.
1.2 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.
1.3 Types of brackets: brackets with cups are used as condensing type, and flat head brackets are used as lamps of large-angle astigmatism type.
2. Silver glue
2.1 The role of silver glue: the role of fixing the chip and conducting electricity.
2.2 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%.
2.3 Use of silver glue: refrigerate, thaw and stir well before use, because the silver powder will precipitate after the silver glue is placed for a long time, and the performance of the silver glue will be affected if it is not stirred evenly.
3. Chip
3.1 The role of the chip: The chip is the main component of the LED Lamp and is a luminescent semiconductor material.
3.2 Composition of 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.
3.3 The structure of the wafer: welding single wire positive polarity (P/N structure) wafer, double wire wafer. The dimension unit of the wafer: mil. The pads of the chip are generally gold pads or aluminum pads. The pad shapes are round, square, cross, etc.
3.4 The luminous color of the wafer: The luminous color of the wafer depends on the wavelength. The common visible light classifications are roughly: dark red (700nm), dark red (640-660nm), red (615-635nm), amber (600-610nm), Yellow (580-595nm), yellow-green (565-575nm), pure green (500-540nm), blue (450-480nm), violet (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.
4. Gold wire
4.1 The role of gold wire: connect the chip PAD (pad) and the bracket, and make it conduct.
4.2 The purity of the gold wire is 99.99%Au; the elongation is 2-6%, and the size of the gold wire is: 0.9mil, 1.0mil, 1.1mil, etc.
5. Epoxy resin
5.1 The role of epoxy resin: to protect the internal structure of the Lamp, it can slightly change the luminous color, brightness and angle of the Lamp; to shape the Lamp.
5.2 The encapsulation resin consists of four parts: A glue (main agent), B glue (hardener), DP (diffusion agent), and CP (colorant). Its main components are epoxy resin, acid anhydrides (acid anhydrous), high light diffusing fillers and heat stable dyes.
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