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Light emittting polymer.ppx

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  • 1. LIGHT EMITTTINGPOLYMER
  • 2. LEP It is a polymer that emits light when voltage is applied to it. The structure comprises of thin film semi conducting polymer sandwiched between anode and cathode
  • 3.  Energy difference between the valence band and conduction band of the semiconducting polymer determines the wavelength, i.e., color of emitted light
  • 4. STRUCTURE AND WORKING It’s display solely consists of the polymer material manufactured on a substrate of glass or plastic and doesn’t require additional polarizers that are typical of LCDs
  • 5. TYPES OF LEPS1.Flexible2.Stacked organic(SOLEP)3.Transparent organic(TOLEP)
  • 6. Stacked TransparentFLEXIBLE LEP LEP LEP
  • 7. MANUFACTURING METHODS1. Spin coating process: In this a glass substrate is spinned at a fixed angular velocity on which a plastic solution is poured.2. Printer based Technique: LEPs can be patterned using a wide variety of printing techniques. The most advanced is ink jet printing with a resolution as high as 360 DPI.
  • 8. ADVANTAGES Operates with 3.3volts only As active material is plastic cost is much less than CRT, LCD. Greater power efficiency than all other flat panel displays Life time of more than 30,000 hours Can be viewed at any angle Fast switching speed i.e. 1000 times faster than LCDs. Higher luminescence efficiency
  • 9. LIMITATIONS Ageing of LEP Space charge effect
  • 10. APPLICATIONS Multi or full color cell phone display HD Television display Light weight wrist watches Military applications Aircraft cockpit instrumentation
  • 11. CONCLUSION LEP technology is now set to change the products we use to view the world
  • 12. Ch.Ravi (08911A0474)B.V Chalapathi (08911A04B1)

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