LED is a semiconductor device. LED produce incoherent narrow spectrum of light when it is in forward biased condition. The color of the light emitted depends on the composition of the semiconductor material used in manufacturing of LED. It is extensively used in an array of application such as displays devices on clock, digital watches, lighting bulbs, radios and calculators. LEDs also find its applications in high definition television display, camera, camcorder, telecommunications, optical fiber communication and TV remote controls. The application of LED is even exceeded to the jewelry and wearable’s.
On the basis of semiconductor material, the global LED material market can be broadly classified in four broad categories namely gallium arsenide (GaAs), gallium arsenide phosphide (GaAsP), gallium phosphide (GaP) and others. Gallium arsenide is the most widely used chemical in all major classes of led such as miniature led, high power led and application specific led. Gallium arsenide grasped the largest market share in 2013.
Based on the various precursor used during the metal organic chemical deposition vapor (MOCVD) the lead material can be classified as trimethylgallium (TMGa), trimethyl aluminum (TMA), trimethylindium (TMIn), triethylgallium (TEGa) and C2Mg2. trimethylgallium (TMGa) is the most widely used LED material and grasped the largest market share in 2013.