Polymer light emitting diode
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Transcript of Polymer light emitting diode
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POLYMER LIGHT EMITTING DIODE
PLEd-By
J.PRANAY
J.NIKHIL KUMAR
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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.
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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
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PLED as a special type of OLED
semiconducting properties
• π-conjugated polymer
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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)
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Flexible packaging material
Electrode Flexible electrode
Emitting layer ⇒ Flexible Semiconducting polymer
Substrate⇒ Flexible !!(Glass → Plastic)
Flexible Display
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TYPES OF LEP……(PLED) Flexible Organic Light
Emitting Polymers(FOLEP).
Stacked Organic Light Emitting Polymers(SOLEP).
Transparent Organic Light Emitting Polymers(TOLEP)
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TRANSPARENT ORGANIC LEP(TOLEP) Substrate is transparent. LEPs sandwiched between two transparent layers. Top and Bottom emitting layers. Better efficiency. Fast response.
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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.
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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.
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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
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ADVANTAGES …. Low production cost Low power consumption Very thin displays Large viewing angle Simple to use Short response time Flexible & Robust
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DRAWBACKS… Emitter is sensitive to oxidation and
humidity Short lifetime at high luminescence..
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APPLICATIONS… Displays Multi or Full color Cell phone displays Television Laptop Lightweight Wrist watches. Automobile light systems without bulbs. Roll-up refreshable e-newspaper.
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LAPTOPS……
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TELEVISIONS…
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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…..
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THANK YOU
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