wireless monitoring system of gas detector - Faculty of Electrical ...
wireless monitoring system of gas detector - Faculty of Electrical ...
wireless monitoring system of gas detector - Faculty of Electrical ...
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17<br />
2.5.2 LED<br />
A light emitting diode (LED) as shown in Figure 2.12 is a semiconductor light<br />
source. LED is used as the indicator lamp in the many devices and is increasingly used<br />
for lighting. The LED is based on the semiconductor diode.<br />
Figure 2.11: LEDs images<br />
When a diode is forward biased which is switch on, electron are able to<br />
recombine with holes within the devices, releasing energy in the form <strong>of</strong> photon. This<br />
effect is called electroluminescence and the colour <strong>of</strong> the light is determined by the<br />
energy gap <strong>of</strong> the semiconductor. LED are usually integrated optical components are<br />
used to shape its radiation pattern and assist in the reflection.
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