Organic Light Emitting DiodesOLED

PRESENTATION ON

SUBMITTED BY-SHUBH MEHRA

1157 (EC-3)

SUBMITTED TO-RAVI SHRIVASTAVA

EC 407

CONTENTS

1. Introduction2. What is an OLED3. History4. Structure of OLED5. Working Principle6. Different Types7. Applications8. Advantages9. Future Scope10. Conclusion

INTRODUCTION

• It is composed of organic LEDs.

• Main principle behind its operation is electroluminescence.

• Emerging technology for displays in devices.

• Offers brighter, thinner, high contrast, flexible displays.

What is an OLED?

• An OLED is a light-emitting diode containing thin flexible sheets of an organic electroluminescent material, used for visual displays.

• They emits light with the help of electricity.

• They does not require any backlight that is they are self emitting devices.

• They are made from carbon and hydrogen.

HISTORY

• First developed in early 1950s in France.

• In 1960, AC driven electroluminescent cells using doped anthracene was developed.

• In 1987, the first OLED device was developed by Eastman Kodak.

• In 1990, electroluminescence in polymers were developed.

STRUCTURE OF OLED

The structure of OLED comprises of –

Substrate Anode Organic layer1. Conductive layer (Hole transport

layer)2. Emissive layer (Electron transport

layer) Cathode

WORKING PRINCIPLE

• The voltage is applied across anode and cathode and the current flows from cathode to anode through organic layers.

• The electron will flow to emissive layer from the cathode meanwhile they are also removed from conductive layer leaving behind holes.

• The holes jump into emissive layer where they combine with electrons and the light is emitted.

DIFFERENT TYPES

• Passive OLED

Commonly called as passive matrix OLED

The organic layer is between cathode and anode run perpendicular.

Easy to make Best for small screens Uses more power

• Active OLED

Commonly called as active matrix OLED

Full layers of cathode and anode Require less power Higher refresh rates Suitable for large screen

APPLICATIONS

Some of the applications of OLED are-

1. Televisions2. Cell Phones Screen3. Wrist Watch4. Computer Screens5. Bendable Devices 6. Portable Devices Display

ADVANTAGES

Faster response time than LCD Light weight and thin Less power consumption High contrast and brighter

display Less expensive than LCD Wider viewing angle, upto 170

degrees

FUTURE SCOPE

The future use of OLED looks bright. The manufacturers are looking to produce it in even more cheaper way and are also working in boosting its overall lifespan.

The future uses of OLED includes-

o GPS systemo Scroll laptops

CONCLUSION

Organic LEDs are evolving as the next generation displays. As this technology matures in the future, it will certainly be able to improve upon the existing limitations of LCDs which includes-

High power consumption Poor contrast ratio Limited viewing angle

THANK YOU!!