OLEDSemester IVElectronics &Communication Engineering

Prepared By- Dishank (13BEC021) Kevin (13BEC074)

Guided By- Prof. Usha Mehta

ORGANIC

LIGHT

EMMITING

DIODE

ContentWhat is an OLED?How is it made?How do OLEDs emit light? Types of OLEDsAdvantages and DisadvantageFuture Of OLEDsConclusion

INTRODUCTION

These all devices may be possible in the near future with the help of a technology called Organic Light-Emitting Diodes.

What is an OLED?

An OLED is any light emitting diode in which organic layers are responsible for light emission.

The Basic Principal

Electroluminescence is a process in which a material emits light in response to electrical fieldapplied across it.

Cathode  - The cathode injects electrons into emissive layer.

Emissive layer - This layer is made of polyfluorene that transport electrons from the cathode. This is where light is made.

Conducting layer - This layer is made of polyaniline that transport "holes" from the anode.

Anode – It is kept transparent.Usually made up of Indium tin oxide (ITO) that removes electrons.

Substrate - The substrate supports the OLED.

How do OLEDs Emit Light?

How it works?

Types of OLEDsPassive-matrix OLEDActive-matrix OLEDTransparent OLEDTop-emitting OLEDFoldable OLEDWhite OLED

Passive Matrix

The organic layers are between strips of cathode and anode.

The intersections form the pixels.

Easy to make

Uses more power

Active-matrix OLED

Full layers of cathode and anode.

Anode overlays a thin film transistor (TFT).

Requires less power

Higher refresh rates

Transparent OLEDs

Transparent OLEDs have only transparent components (substrate, cathode and anode)

When turned off, are up to 85 percent as transparent as their substrate.

Top emitting OLEDs

Top-emitting OLEDs have a substrate that is reflective.

Foldable OLED

Foldable OLEDs have substrates made of very flexible metallic foils or plastics.

White OLED

White OLEDs emit white light that is brighter, more uniform and more energy efficient.

Why it’s so great? Less power consumption Lower cost in the future Flexible Display Thin display Safer for environment

Better contrast ratio

Wider Viewing Angle

Major Drawbacks

LifespanEasily damageableOutdoor performanceComplex fabrication methods

OLED VS OTHERS

Future Aspects Finding a cheap way to produce “Roll-To-Roll” Manufacturing Increasing efficiency of blue OLED Increasing Lifespan of OLED

Corporation in OLED’s

Conclusion

REFERENCES

1. http://electronics.howstuffworks.com/oled.html 2. http://www.tridonic.com/ae/img/OLEDmodule_LUREON_REP.jpg3. http://

cdn1.bigcommerce.com/server4300/905b4/product_images/uploaded_images/how-do-leds-work.jpg

4. http://s.hswstatic.com/gif/oled-top-emitting.gif5. http://

www.homeinfo.hu/images/stories/kivitelezes/villamossag/OLED_5.jpg6. http://www.maximumpc.com/files/u90693/anatomy-full.jpg

Thank You