Tuesday, December 10, 2013

   An Introduction to LED Lights and Panel  

LED stands for Light Emitting diode. As the name suggests it’s a kind of diode used for emitting light.  It is a source of light made from semiconductor. It emits low intensity light along with latest versions like ultraviolet, visible and infrared wavelengths with higher brightness.  In LED electrons recombine with holes and release energy in terms of photons. This whole process of electrons entering into holes and producing energy in form of photons called as electroluminescence. In this process color of light depends on energy band gap of semiconductor used. It is been used in various application like traffic signals, public display board, vehicles display board, advertising, aviation, decoration etc. They can also be used in remote control units of television and other domestic equipments along with communication technology like creating wireless internet access i.e. Li-Fi or light fidelity.  LED is made up of a semiconducting material chip which is doped with impurities creating p-n junction. Electrons and holes are carriers of charge in diodes and they flow into the junction out of electrodes with different voltages. After electron meets with hole, it falls in a low energy level and release energy in the form of photon. Materials used in these diodes have a direct band gap along with energies relating with visible, infrared or ultraviolet light.  Color and wavelength of light depends directly on band gap energy of the material which is used in formation of p-n junction.  The materials used for LED must have direct band gap along with energy corresponding visible, infrared or ultraviolet lights.  Development of LED started with red devices and infrared devices which consist of gallium arsenide. Recent development in the field of material science has helped in development of devices with shorter wavelengths which can emits lights of different colors.  Most of the materials which are used in the production of LED are of very high refractive index. Due to which more light is reflected back on the metal or air surface interface.   Conventional LED indicators are designed in such a way that it consumes about 30-60 mW of electrical power. Philips Lumileds develop a power LED capable of continuous operation at one watt. They used bigger semiconductor die sizes for handling huge power inputs. These semiconductor dies were mounted onto metal slugs for allowing heat to leave LED die.  Key advantages of led light panel is their high luminous efficiency, Use of less power, provides more safety as compare to conventional light sources, more reliable etc.  These can stay longer than traditional ones.  From the market scenario it can be made clear that consumption of traditional lights are decreasing while LED light PANEL are increasing.  So it can be concluded that people are moving towards more energy efficient sources of light. The expected growth in 2016 of LED GROW lightS is between 4-6%. Asia alone account for approximately 42% of the global light business upto 2020.  Some of the manufacturer in many parts of the globe are pioneer in the field of  designing, manufacturing and supplying of latest technologies based LED products like Fibre optic light, LED grow lights etc. 

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