1. POLYMER LED Presented By UMAKANTA MOHAPATRO ROLL # EI200113370
December 2004
Under the Guidance of
Mr. Prabhat Kumar Mohapatra

2. INTRODUCTION Polymer LED (light-emitting diode)- sometimes
called light-emitting polymer or polyLED - is a
technology based on the use of polymer as the
semiconductor material in LEDs.
It is a novel technology to manufacture very thin
light sources and displays
Polymers are large molecules widely known as
plastics.

3. Light Emitting Polymers convert electrical power into visible light:
This is related to the fluorescence of polymers where
UV-radiation is converted into visible light:
Textmarker
Fluorescent
Polymer
UV-radiation
visible light

4. to be a Light Emitting Polymer.
A polymer needs to show fluorescence and to conduct
electricity.
visible light
UV radiation
electrical charge +
to be a Light Emitting Polymer.

5. A thin film of light Emitting Polymer put between two electrodes will glow... Light Emitting Polymer Device
Metallic Counter
Electrode
Thin Plastic
Film of LEP
Transparent
Electrode + -
Substrate
Emitted light

6. If voltage is applied, positive charge carriers
move into the anode,negative charge carriers into the cathode!
Positive and negative charge carriers combine and generate an neutral exited state. This exited state decays and generates Visible light
On each cm² of a device running at standard brightness this happens
times per second!!!

7. Like an ink a solution of Light Emitting Polymer can be used to easily "paint" an electrical light source onto an appropriate substrate it's like 'painting' an electrical light! + -

8. By engineering the chemical structure of the Light Emitting Polymer all emission colours can be obtained.

9. Covion- flexible displays
Because plastic materials are flexible and robust even non-planar displays can be manufactured LEP- Non Planar Displays
Light Emitting Polymer Film
Transparent
Protective Film
Covion- flexible displays

10. Polymer electronics laboratory The photo shows where each of the following steps in the fabrication sequence takes place.

11. Light Emitting Polymers cover a large range of applications:
Easy to use technology.
Thin and light weight displays for portable electronics.
Very high brightness.
Low operating voltage (2 - 6 Volts).
All colours possible.
All shapes and non-planar displays possible.

12. "... high brightness at low operating voltage"

13. Light Emitting Polymers have a lot of advantages …
Low energy consumption
Useful for large area lighting
Simple to use technology
Permits flexible lighting and displays
A technology for the future

14. PLED Vs. LED
LED is made from inorganic emitting material like
silicon, III-IV semiconductors, but PLED is made
from inorganic material like polymers.
LED is used as narrow field of application, but
PLED is used as very wide application field.
PLED gives more benefits than LED.
PLED Vs. LCD
Full-color OLED-based displays will have replaced
active matrix LCDs as the market dominant display
technology by around 2010.

15. CONCLUSION
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.
LEP technology will initially be used to extend the performance of current displays in mobile communication, computers and consumer electronics.
The fast switching speed of LEP would allow small, high-resolution screens to be constructed

16. THANK YOU !!!