Different color leds have different Vf values, and the Vf values of the same color leds are different, and most applications need to be separated and separated.
The maximum forward current of different kinds of leds is different. The maximum forward current of the light-emitting diode, which is 5mm in diameter, is usually 25mA, and the practical application is 20mA. In order to ensure the reliable and steady work of the led, constant current technology is required to drive the light-emitting diode.
Light-emitting diodes are called leds. By gallium (Ga) and arsenic (AS), phosphorus (P) of compound made of diode, when electrons and holes composite can radiate light, thus it can be used to make the light emitting diode, AS a light in the circuit and instrument, or of text or figures. Phosphorous arsenide diode emits red light, phosphating gallium diode emits green light, and silicon carbide diodes emit yellow light.
It is a semiconductor diode that converts electrical energy into light energy. Often abbreviated as LED. Leds, like ordinary diodes, are composed of a PN junction and have a unidirectional conductivity. When adding forward voltage to light emitting diode, from P area into N the holes and by N area into P area electronic, near the p-n junction several micrometers respectively with the hole recombination of electrons and P N area area, produce the spontaneous emission fluorescence. The energy state of electrons and holes in different semiconductor materials is different. When the electrons and holes are compounded, the energy released is different, and the more energy is released, the shorter the wavelength of light emitted. Commonly used are red, green or yellow leds.