LED or
light emitting diode is a type of
diode that gives off light when energized. LED starts to light when the forward bias voltage across it is more than the required voltage. Picture below is the LED symbol and diagram. The
anode is a pin which is connected to the positive side of a source or a battery while a
cathode is negative side. Anode pin is usually much longer than a cathode pin. Cathode pin is usually to a flat side of a diode and has much larger plate compared to an anode.
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| LED symbol and diagram |
The common colors of LED are red, yellow, green, blue, yellow, orange, and white. This LED has different forward voltage and currents, and emits light of different wavelengths and intensities.Example is the
high efficiency red LED with a wavelength of 635 nanometer, forward voltage is 2V,and the dye material used is GaAlAS (Gallium Aluminum Arsenide) or GaAS (Gallium Arsenide). Some of the common LEDs are listed in the diagram/table below.
Just click table below to view.
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| LED properties table |
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