Light Emitting Polymers


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Light Emitting Polymers

  1. 1. PRAYAG RANJAN SETHI EC200127172 Presented by Under the guidance of LIGHT EMITTING POLYMERS
  2. 2. INTRODUCTION <ul><li>LEP is an emissive technology that emits light as a function of electrical operation. </li></ul><ul><li>It exhibits electroluminescent characteristics. </li></ul><ul><li>It emits light under the application of electric field.e.g- polyvinyl chloride. </li></ul><ul><li>LEP was discovered in 1990 </li></ul>PRAYAG RANJAN SETHI EC200127172  
  3. 3. CONDUCTING POLYMERS <ul><li>Three type of conducting polymer are there </li></ul><ul><li>1.conductor(bg-1ev) </li></ul><ul><li>2.semiconductor(bg-2.2ev) </li></ul><ul><li>3.insulator(bg-10ev ) </li></ul>PRAYAG RANJAN SETHI EC200127172  
  4. 4. Structure of LEP <ul><li>LEP consists thin film of polymer sandwiched between an anode and a cathode. </li></ul><ul><li>Indium tin oxide(ITO) is usually as anode. </li></ul><ul><li>Metals are used as cathode. </li></ul>PRAYAG RANJAN SETHI EC200127172  
  5. 5. How LEP works <ul><li>Electric field is applied between two electrodes. </li></ul><ul><li>The electron are injected from cathode and holes from anode. </li></ul><ul><li>The injected charges recombined &decay radiatively. </li></ul>PRAYAG RANJAN SETHI EC200127172    
  6. 6. <ul><li>Electric field is applied between two electrodes </li></ul>PRAYAG RANJAN SETHI EC200127172 + -
  7. 7. PRAYAG RANJAN SETHI EC200127172 + - Then both types of charge carriers migrate into the polymer + – + – + – + – + – + – + – + –
  8. 8. PRAYAG RANJAN SETHI EC200127172 + - + – + – + – + – – + – + + – – + – + Positive and negative charge carriers combine and generate an neutral exited state( )
  9. 9. PRAYAG RANJAN SETHI EC200127172 + - + – + – + – + – – + – + + – – +
  10. 10. Fabrication <ul><li>First the polymer coated on the ITO surface. </li></ul><ul><li>Then four steps are done. </li></ul><ul><li>cleaning. </li></ul><ul><li>spin coating </li></ul><ul><li>depositing </li></ul><ul><li>testing </li></ul>PRAYAG RANJAN SETHI EC200127172
  11. 11. Cleaning <ul><li>Each surface is cleaned by alcohol based cleaner. </li></ul><ul><li>Then it is put to a UV ozone cleaner where it is bombarded by UV rays. </li></ul>PRAYAG RANJAN SETHI EC200127172
  12. 12. SPINCOATING <ul><li>ITO is placed on the spinning apparatus. </li></ul><ul><li>Next several polymeric drop smeared on the surface. </li></ul><ul><li>Once coating completed it is taken to the surface scanner for close scanning. </li></ul><ul><li>The ITOs are placed on the spinner and than the polymer is speed over the surface. </li></ul>PRAYAG RANJAN SETHI EC200127172  
  13. 13. DEPOSITING <ul><li>The samples are placed above the electrodes. </li></ul><ul><li>The electrodes are connected via high resistance metal alloy. </li></ul><ul><li>Once voltage is increased the airborne molecules scatters and deposited on the glass. </li></ul><ul><li>The thickness deposited depends upon the properties of polymer & glass. </li></ul>PRAYAG RANJAN SETHI EC200127172
  14. 14. TESTING <ul><li>Once deposition is completed,the samples are tested for light emittance. </li></ul><ul><li>This simply done by creating electric potential between the electrodes of the substrate. </li></ul>PRAYAG RANJAN SETHI EC200127172
  15. 15. ADVANTAGES PRAYAG RANJAN SETHI EC200127172 <ul><li>Low energy consumption </li></ul><ul><li>Usefull for large area lighting </li></ul><ul><li>Simple to use technology </li></ul><ul><li>Permits flexibl e lighting and displays </li></ul><ul><li>A technology for the future </li></ul>
  16. 16. <ul><li>It has both electrical and optical property. </li></ul><ul><li>It is simpler &cheaper. </li></ul><ul><li>It permits flexible lighting and display . </li></ul><ul><li>It is technology fior the future. </li></ul>PRAYAG RANJAN SETHI EC200127172 Conclusion
  17. 17. <ul><li>THANK U !! </li></ul>PRAYAG RANJAN SETHI EC200127172