Why is the life of LED lights long?
That is to start from the principle of LED lighting. LED (Light Emitting Diode ), which is a light emitting diode . It is a semi-conductive solid state light emitting device. It uses a solid semiconductor chip as a luminescent material. When a forward voltage is applied to both ends, red, yellow, green, cyan, orange, purple, and white light are directly emitted. Many changes: LED light source can use LED short-time short and red, green, blue three primary color principle, under the control of computer technology to achieve multiple changes in color and pattern, is a freely controllable "dynamic light source".
The illuminating mechanism of incandescent lamps is that electric energy heats and emits luminescent tungsten wires. After a long period of heating, the tungsten wires will age or even burn out. At this point, the life of incandescent bulbs ends, and the luminescence mechanism of LEDs ends. It is determined by the special composition of the diode. The diode is mainly composed of a PN junction chip, an electrode and an optical system. When a forward bias is applied to the electrode, electrons and holes are injected into the P region and the N region, respectively. When the balance of minority carriers and majority carriers is balanced, excess energy is converted into light energy in the form of radiated photons. The illuminating process consists of three parts: carrier injection under forward bias, composite radiation, and light energy transmission.
It can be seen that the diode mainly emits light by the continuous movement of carriers, and there is no aging and burning phenomenon. Its special light-emitting mechanism determines its luminous lifetime of up to 50,000-100,000 hours.
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