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                Your Position:Home > News > LED-Light Emitting Diode Basics

                LED-Light Emitting Diode Basics

                Views:0 次 | Date:2014-04-06

                LED-Light Emitting Diode Basics
                LEDs are electronic devices. When current flows through the diode in the pass-through direction, it emits light.
                The LED was invented in 1956, and has been in industrial use since 1970. However, until recently red, yellow and green LEDs were mainly used.
                White LEDs were introduced in 1995. They are manufactured by luminescence conversion. In this process, a blue LED is coated with yellow phosphor in order to produce white light. The amount of phosphor influences the color temperature. The thicker the phosphor layer, the warmer the light.

                LED Phosphors

                White LEDs are made by coating them with a phosphor that absorbs a proportion of the blue light emitted by the diode and emitting light across the rest of the visible spectrum. Typically one or two phosphors are used to convert the blue to white. Either a single broad yellow phosphor or a combination of green and red will produce the desired effect.

                LED chip is the basic component

                The LED chip is the basic component to generate light with the help of semiconductor technology. It is a semiconductor component made from two crystal layers of different doping. One of these crystal layers is referred to as the p-doped (p+) layer, the other one as the n-doped (n-) layer. A light emission is generated at the barrier junction of the pn transition during current flow in conducting direction, i.e. with the anode (p+) connected to the plus terminal and the cathode (n-) connected to the minus terminal.

                Benefits of LEDs

                Very low power consumption
                Low heat generation
                Long life (up to 50,000 hours)
                Low maintenance cost
                Mercury-free
                No UV radiation
                Small design
                Precise light guidance
                Very good color rendering properties

                Service life – L70

                As soon as the light current has fallen back to 70% of the original value, the light has reached the end of its useful service life.
                The guaranteed service life of an LED is at present up to 50,000 hours.
                The service life is greatly influenced by the operating temperature of the LED. It is therefore important when manufacturing LED lamps to achieve a correct balance between power output and cooling in order to ensure long life.

                CRI – Color Rendering Index

                The Color Rendering Index (CRI), also termed the Ra value, indicates how true the colors in the light are.
                The maximum of 100 corresponds to natural daylight.

                Color temperature

                The color temperature is a measure of the color impression made by a light source; its unit is the Kelvin (K).
                Warm/yellowish light colors have a low color temperature. The cooler/more blueish the light color, the higher the light temperature.

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