Peeking into the mystery of LED lamp beads: 1W LED lamp bead disassembly

Light-emitting diode is a new light source for lighting in the 21st century. It has the advantages of high light efficiency, low working voltage, low power consumption and small size. The light source itself does not contain harmful substances such as mercury and lead, and has no infrared or ultraviolet pollution, and will not cause pollution to the outside world during production and use. Therefore, whether it is from the perspective of saving energy, reducing greenhouse gas emissions, or reducing environmental pollution, it is a general trend to develop LED as a new type of lighting source to replace traditional lighting equipment.

The main components of LED lamp beads are: brackets, chips, glue, phosphors, wires.

Bracket: Well-known brands in the market include Taiwan Yiquan, Jiale Electronics and Huayi Microelectronics. The bracket is commonly called the "light cup" and is mainly used to hold the LED chip .

Chip: The chip is the core device in the lamp bead, also called "wafer", which is used to illuminate. Common chips in the market are: USA: CREE , Bridgelux; Japan: Nichia, Toyota Synthetic; Osram, Germany; Taiwan: Jingyuan, Keli (Chimei Group), Guang Jia, Taigu, Guanghong, New Century, Yiguang, Qihong, Guanglei; Mainland China: Xiamen Sanan, Shanghai Blu-ray, Shilan Mingxin, Dalian Lumei.......... (The mainland now mainly uses Taiwanese chips)

Glue: Silicone resin: The advantage of this glue-packed lamp bead is that it has good heat dissipation performance and less light decay. The disadvantage is that the wire connecting the chip is easily broken and the price is relatively higher. Epoxy resin: the advantages of this glue package lamp bead The cost is low, the disadvantage is that the heat dissipation performance is poor, the light decay is greater, and the lamp beads are prone to yellowing. The well-known silicone glue brands on the market are: Dow Corning, Shin-Etsu Chemical

Phosphor: The more famous phosphor on the market is: Intermec, blue light + yellow phosphor to stimulate white light.

Wire: A wire that connects a chip and a 2-terminal conductive pin, called a wire. Basically, the wires are made of 0.999 pure gold wire, and the diameter is divided into: 0.8 mil, 1.0 mil. There are also some low-cost manufacturers who use copper-doped alloy wires. However, the quality will be worse, because the overcurrent and heat conduction capability of the gold wire is very high, and the heat can be conducted to the negative electrode through the gold wire in time. Moreover, the tensile properties of the gold wire are stronger, and it is not easy to cause a dead lamp due to the breakage of the gold wire.

Start below.

Bottom of the bracket (see the figure below, the same below)

Open epoxy protection cover

Epoxy protective cover

Epoxy protective cover