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hey everyone this is Hodge and this presentation is about organic LEDs I've done this under the guidance of Professor Healy before starting this presentation I would like to give an outline first initially we never see the principle behind OLEDs what are those how they work what are their advantages and disadvantages why we should use OLEDs instead of other relatives and LCDs and finally the conclusion the principle behind organic LEDs electroluminescence it is also known as e L it is an optical and electrical phenomena in which a material emits light in response to the passage of electric current or strong electric field because of radiative recombination of electrons and holes in a semiconductor the excited electrons release their energy as photons which is light prior to recombination electrons and holes may be separated either by doping the material to form a PN Junction or through