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

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.

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

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.

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

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 1.000.000.000.000.000 times per second!!!

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! + -

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

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

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

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.

"... high brightness at low operating voltage"

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

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.

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

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