organic light emitting diode2

8/8/2019 Organic Light Emitting Diode2

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ORGANIC LIGHT EMITTING DIODE

By: shashank shekhar

Branch E&I0705232021Seminar guide:Rahul Verma


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BASIC INTRODUCTION OF OLED

OLED are the optoelectronic devices based on organic

materials and emit light when voltage applied to them.

based on the phenomenon electroluminescence.

Provide brighter display with less power consumption.


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CONSTRUCTION OF OLED

Cathode

Emissive layer or electron transport

layer ETL(e.g. polyflurene)

Conductive layer or hole transport

layer HTL(e.g. polyaniline)

Anode(transparent)

Substrate(glass or plastic)


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ORGANIC MATERIALS USED IN OLED

The p-n junction is made

from the organic compounds

such as Alq3 and diamine,

polyflurene , polyaniline etc.


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BASIC WORKING

The battery or power supply applies a voltage across the

OLED

The current flows from cathode to anode.

Cathode gives electron to the emissive layer .

Anode removes electron from the conductive layer so there is

excess of holes in it.

CONT.


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CONT ..

At the junction of the two layers electrons recombines with the

holes.

Due to recombination the electrons gives light in the form of

photon.

The color of light depends on the molecule used in the

emissive layer.


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TYPE OF OLED DISPLAY

Passive matrix display

Active matrix display

Vertically stacked display

Flexible OLED display

Transparent OLED display


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PASSIVE MATRIX TYPE OLED

It consist of strips of cathode, organic

layer, strips of anode.

The intersection of cathode and anode

makes up a pixel .

External circuitry supplies current.

More power consumption than any

other OLED display.

Best suited for small screens.


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ACTIVE MATRIX TYPE DISPLAY

It have full layer of cathode ,organic

material, anode.

Anode overplayed by thin film

transistor(TFT).

TFT determines which pixel get turned on

to form an image.

Less power consumption than passsive

type.


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VERTICALLY STACKED OLED

Based on stacking the red, green and blue sub pixels on top of one another.

AdvantageHigher resolutionScalable to larger pixel size


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TRANSPARENT OLED

The substrate is either opaque or

reflective .It can be top only emitting or bottom

only emitting or top and bottomemitting


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ADVANTAGE OF OLED

Very thin panel (.3mm)

Self luminous

Low power consumption

High brightness

Wide visibility (more than 170degree)


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CONT.

Better response time

Very large displays are possible (more than 100 inch)

Flexible substrate


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LIMITATIONS

Smaller lifespan

Higher cost

Color balance issue

Water damage


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USE OF OLED

Car display

Mobile ,television screen

Digital camera

Computer monitors


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INDUSTRIAL VIEW

Kodak was first to release a digital camera with an OLED

display in 2004 ,the Ko dak easyshare LS633 .

In 2007 Sony launched first OLED television XEL-1

Samsung developed a prototype laptop in 2008.


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THANK YOU!!!!!

ANY QUERY??

organic light emitting diode2

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