Polymer Led

Light Emitting Polymers (LEPs) are semi-conducting devices that exhibit electroluminescent characteristics. The phenomenon known as electroluminescence (EL) is caused by the emission of light generated from the recombination of electrons and holes electrically injected into a semi-conductor. So far conventional and marketable electroluminescent devices (ED s) have always been inorganic semi-conductors but recent developments in the late 1990s are opening the doors for organic materials.


Polymer light emitting diodes (PLEDs) are optoelectronic devices ctric current flow through them. A simple PLED consist of a fluorescent polymer layer sandwiched   between two metal electrodes. Under application of an electric field electrons and holes are injected from the two electrodes in to the polymer layer, where they meet and recombine to produce light. They have been developed for application in flat panel displays. Envision light weight, portable and flexible flat panel displays that provide visual imagery that is easy to read, vibrant in colour and less consuming of power.

A  typical  polymer  LED  consists  of  a  thin  film  of  a  luminescent  conjugated polymer sandwiched between an anode and a cathode, on top of a glass substrate. Indium Tin Oxide (ITO) is most frequently used as the anode because it exhibits conductive properties with a relatively high work function. It also is optically transparent, thus allowing the light to propagate through the device.

Polymer Led Seminar Ppt


1.     Introduction               
2.      Evelution Of Pled               
3.      Construction              
4.      How Pled Works                      
          4.1 Bonding In Lep           
          4.2 Energy Level Diagram Of Lep     
5. P Ledand Lcd Comparison   
 And etc
Dot Matrix Displays

A full-color display requires the patterning of individual red, green, and blue pixels. This is usually a technologically complicated process, but because LEPs can be deposited from solution, patterning using a wide variety of printing techniques is possible. The most advanced technique is ink-jet printing . CDT have demonstrated resolutions as high as 360 dpi, and it is likely that much higher resolutions will be obtained in the near future. The inkjet approach is easily scaled to large-screen displays.     

LEP technology combines simple solid-state construction, low drive voltage, and high-efficiency OLEDs with large-area pattern ability and the possibility of flexible substrates. This combination of characteristics provides a powerful base for building high-information-content displays ranging from micro emissive displays to large-area screens. We expect that LEP technology will initially be used to extend the performance of current displays in mobile communications, computers, and consumer electronics but will quickly lead to new applications.


  Today most of electronics circuits are integrated circuits/semiconductor chips fabricated out of silicon.There are some institutions comes out with plastic circuits that are used as the electronic circuits. This field of electronics is termed as polytronics .We think of plastics more as insulators rather than electricity conducting materials. But of late, research institutes have come up with innovative ideas to integrate plastics into main stream electronics as it has been established that certain plastics have typical conductive and light emitting properties.


          Performance of polymer LEDs depends up on many parameters such as electron and hole mobility, magnitude of applied field, nature of hole and electron transport layers and excitation life time. Polymer materials are poised as never before to transform the world of circuit and display technology.