POLYMER LIGHT EMITTING DIODE

PLEd-By

J.PRANAY

J.NIKHIL KUMAR

What do you mean by pled??? In light emitting diodes by using polymers

we can make more efficient LED displays. These are majorly very useful for the

displays of portable devices like mobile phones, laptops,etc.

In PLEDs we use special type of polymer called π-conjugated polymer which has semiconducting properties.

Polymers are chains of smaller molecular components called MONOMERS.

HISTORY OF PLEDs 1953: electroluminescence in organic materials was observed 1987: first OLED with driving voltage of 10V 1989: discovery of π-conjugated polymers The making first PLED is credited to the Cavendish laboratory Of Cambridge university in 1989. Polyphenylene vinylene (PPV) is the first LEP discovered Beginning of intensive research because of the

advantages of polymers

PLED as a special type of OLED

semiconducting properties

• π-conjugated polymer

ARCHITECTURE…… Thin film of semiconducting polymer is sandwiched between an anode and cathode. ANODE: ITO(INDIUM TIN OXIDE) CATHODE: Metals(depends upon depends upon ). SUBSTRATE: Glass , clear plastic (depends upon depends upon). Voltage is applied between anode and cathode.

Metal Cathode Polymer

Glass Substrate

Transparent Anode (ITO)

Flexible packaging material

Electrode Flexible electrode

Emitting layer ⇒ Flexible Semiconducting polymer

Substrate⇒ Flexible !!(Glass → Plastic)

Flexible Display

TYPES OF LEP……(PLED) Flexible Organic Light

Emitting Polymers(FOLEP).

Stacked Organic Light Emitting Polymers(SOLEP).

Transparent Organic Light Emitting Polymers(TOLEP)

TRANSPARENT ORGANIC LEP(TOLEP) Substrate is transparent. LEPs sandwiched between two transparent layers. Top and Bottom emitting layers. Better efficiency. Fast response.

FLEXIBLE ORGANIC LEP(FOLEP)

Built on flexible substrate. They have the ability to confirm, bend or roll a display into any shape. Ultra lightweight and thin form. They are less fragile and more impact resistant.

STACKED ORGNAIC LEP(SOLEP) Array of vertically stacked TOLEP Sub-pixels. Color is tuned by individually controlling R-G-B subpixels. It will only turn on the desired color pixel only. Can be used in large displays. True color quality.

Screen refreshing rates

Viewing quality

Screen size

Viewing angle

Power consumption

Higher than LCD

Higher than LCD

Size is not limited in PLED display

Glare free up to 180 degrees

Lesser than LCD

COMPARISON WITH LCD

ADVANTAGES …. Low production cost Low power consumption Very thin displays Large viewing angle Simple to use Short response time Flexible & Robust

DRAWBACKS… Emitter is sensitive to oxidation and

humidity Short lifetime at high luminescence..

APPLICATIONS… Displays Multi or Full color Cell phone displays Television Laptop Lightweight Wrist watches. Automobile light systems without bulbs. Roll-up refreshable e-newspaper.

LAPTOPS……

TELEVISIONS…

CONCLUSION….. Have both electrical and optical property A low cost solution for flat panel display. Many manufactures are working to introduce a revolutionary changes in the market. Hazardless to environment. Simpler and cheaper. Have some limitations.

Till it is the superior technology………for the future…..

THANK YOU

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