What is the principle of LED lighting? Then you must first understand LEDs and the structure of LED lights, so that you can know how LEDs emit light.
- What is LED?
LED is the abbreviation of English Light Emitting Diode, which means light-emitting diode in Chinese. It is made of compounds containing gallium (Ga), arsenic (As), phosphorus (P), nitrogen (N), etc.
- Structure of LED lights
The core part of the light-emitting diode is a wafer composed of p-type semiconductor and n-type semiconductor. There is a transition layer between the p-type semiconductor and n-type semiconductor, called a p-n junction. As shown in the picture below, it mainly consists of five parts: bracket, silver glue, chip, gold wire, and epoxy resin.
- LED lighting principle
When current passes through the chip, the electrons in the N-type semiconductor and the holes in the P-type semiconductor violently collide and recombine in the light-emitting layer to produce photons, which emit energy in the form of photons (that is, the light we see).
- Colorful LED lighting principle
If you want to know the principle of colorful LED light-emitting, first let’s get to know the three primary colors of red (R), green (G), and blue (B). Other different colors can be obtained by different combinations of these three colors. For example, when red light and green light are lit at the same time, the red and green lights are mixed into yellow. The color-changing principle of the color-changing lamp is that when two LEDs are lit up respectively through three primary color LEDs, it can emit yellow, purple, and cyan (such as red If the red, green and blue LEDs light up at the same time, they will produce white light. If there is a circuit that can make red, green, and blue LEDs light up in pairs, individually, and three primary color LEDs at the same time, then it can emit seven different colors of light, so the colorful LED lights appear. This phenomenon produces different colors depending on the different proportions of their superposition.