The plug-in LED beads are mainly composed of five materials: bracket, silver glue, chip, gold wire, and epoxy resin.

1、 Plug in LED bead bracket

1. The function of the bracket: conductivity and support

2. Composition of the bracket: The bracket is formed by electroplating the bracket material, consisting of five layers from the inside out: material, copper, nickel, copper, and silver.

3. Types of brackets: cup holder for spotlight type, flat head holder for large angle astigmatism type.

2、 Plug in LED light bead silver adhesive

1. The function of silver glue is to fix the chip and conduct electricity.

2. The main components of silver paste are silver powder accounting for 75-80%, EPOXY (epoxy resin) accounting for 10-15%, and additives accounting for 5-10%.

3. The use of silver gel: Refrigerate, thaw and stir thoroughly before use. Silver gel will precipitate after being left for a long time, and if not stirred evenly, it will affect the performance of the silver gel. WeChat official account: Shenzhen LED Chamber of Commerce

3、 Plug in LED light bead chip

1. The function of the chip: The chip is the main component material of LED Lamp and is a semiconductor material that emits light.

2. Composition of the chip: The chip is composed of materials such as gallium phosphide (GaP), gallium aluminum arsenide (GaAlAs), gallium arsenide (GaAs), gallium nitride (GaN), etc. Its internal structure has unidirectional conductivity.

3. Chip structure: single wire positive polarity (P/N structure) chip, dual wire chip. The size unit of the chip is mil, and the solder pads of the chip are usually gold or aluminum pads. The shape of its solder pads includes circular, square, cross shaped, etc.

4. The luminous color of the chip:

The emission color of a chip depends on its wavelength, and the common classification of visible light is roughly as follows: 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), and purple (380-430nm).

White light and pink light are a mixture of light effects. The most common is a mixture of blue yellow fluorescent powder and blue red fluorescent powder.

5. Main technical parameters of plug-in LED chip:

A、 Voltage current characteristic diagram of the chip;

B、 Forward voltage (VF): The voltage applied across the two ends of a chip to make the chip conduct in the forward direction. This voltage is related to the chip itself and the test current. Excessive VF can cause the chip to be broken down.

C、 Forward current (IF): The forward conduction current generated by a chip when a certain voltage is applied. The size of IF is related to the magnitude of the forward voltage. The operating current of the chip is around 10-20mA.

D、 Reverse Voltage (VR): The reverse voltage applied to the chip.

E、 Reverse current (IR): refers to a leakage current generated by a chip after applying a reverse voltage. The smaller the current, the better. Because excessive current can easily cause reverse breakdown of the chip. WeChat official account: Shenzhen LED Chamber of Commerce

F、 Brightness (IV): Refers to the brightness level of a light source. Unit conversion: 1cd=1000mcd

G、 Wavelength: Reflects the emission color of the chip. Chips with different wavelengths emit different colors of light. Unit: nm

4、 Plug in LED bead gold wire

The function of the gold wire is to connect the chip pad (PAD) with the bracket and enable it to conduct.

The purity of gold wire is 99.99% Au; The elongation rate is 2-6%, and the size of the gold wire includes 0.9mil, 1.0mil, 1.1mil, etc.

5、 Plug in LED light bead epoxy resin

The function of epoxy resin is to protect the internal structure of the lamp and slightly change the luminous color, brightness, and angle of the lamp; Form the Lamp.

The encapsulation resin consists of four parts: A glue (main agent), B glue (curing agent), DP (diffusion agent), and CP (coloring agent). Its main components are epoxy resin, anhydride, high light diffusion filler, and dye.