Light emittting polymer.ppx


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Light emittting polymer.ppx

  2. 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. 3.  Energy difference between the valence band and conduction band of the semiconducting polymer determines the wavelength, i.e., color of emitted light
  4. 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. 5. TYPES OF LEPS1.Flexible2.Stacked organic(SOLEP)3.Transparent organic(TOLEP)
  6. 6. Stacked TransparentFLEXIBLE LEP LEP LEP
  7. 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. 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. 9. LIMITATIONS Ageing of LEP Space charge effect
  10. 10. APPLICATIONS Multi or full color cell phone display HD Television display Light weight wrist watches Military applications Aircraft cockpit instrumentation
  11. 11. CONCLUSION LEP technology is now set to change the products we use to view the world
  12. 12. Ch.Ravi (08911A0474)B.V Chalapathi (08911A04B1)