What is the light emitting principle of LED lights?

What is the light emitting principle of LED lights? The LED lamp is an electroluminescent semiconductor material chip, which is cured on the bracket with silver glue or white glue, and then connected to the chip and the circuit board with silver or gold wires, and sealed with epoxy resin around it to protect the inner core wire. Function, the shell is installed last, so the shock resistance of the LED lamp is good. 1. Lamp bead structure One of the most important light-emitting structures of LED (Light Emitting Diode) lamps is the lamp bead the size of mung beans inside the lamp. Although its size is small, its function is not small.

After zooming in on the structure of the LED lamp bead, we will find a wafer the size of a sesame seed. The structure of the chip is extremely complex, and it is divided into several layers: the upper Z layer is called the P-type semiconductor layer, the middle layer is the light-emitting layer, and the lower Z layer is called the N-type semiconductor layer. So, how is the LED light emitted? 2. The principle of light emission From a physical point of view: when the current passes through the wafer, the electrons in the N-type semiconductor and the holes in the P-type semiconductor collide violently and recombine in the light-emitting layer to generate photons, which emit energy in the form of photons (that is, the light you see) .

led LED is also called light emitting diode, its volume is very small and very fragile, it is not convenient to use directly. So the designer added a protective shell to it and sealed it inside, thus forming an easy-to-use LED lamp bead. After connecting many LED lamp beads together, various LED lamps can be formed.

3. LED lights of different colors Semiconductors of different materials will produce different colors of light, such as red light, green light, blue light and so on. However, no semiconductor material can emit white light so far. But how are the white LED lamp beads we usually use produced? 4. Generation of white LED lights Here we need to mention a Nobel laureate - Dr. Shuji Nakamura.

He invented the blue LED, which also laid a certain foundation for the white LED. Based on this significant contribution, he was awarded the Nobel Prize in Physics in 2014. As for how blue LEDs are transformed into white LEDs, the biggest reason is that there is an extra layer of phosphor in the chip.

The basic light-emitting principle has not changed much: Between two semiconductor layers, electrons and holes collide and recombine to produce blue photons in the light-emitting layer. A part of the generated blue light will pass through the fluorescent coating and be emitted directly; the remaining part will hit the fluorescent coating and interact with it to produce yellow photons. White light is produced by combining (mixing) blue photons with yellow photons.

At present, the application range of LED lights is very common. Taking Xinshengkai Optoelectronics as an example, the LED light strips produced by it are widely used in indoor and outdoor decoration, street scene layout, jewelry counters, gardens, cars, pools, advertising signs, hotels, shopping malls, KTV, leisure places, etc. Compared with traditional lighting tools, LED lights are more modern and fashionable, and they are indispensable decorative items for modern life.