Electroluminesccent polymer

Electroluminesccent polymer and its applicattions

1. ELECTROLUMINESCENT POLYMER

2. Omkar Rane - Roll No: 422 Vishal Tiwari - Roll No: 424 Ishwar Parade -Roll No: 420 Sumedh Shinde - Roll No: 421 Pranav Bhaskar -Roll No : 423 Team Members

3. Sub-Topics Definition of electroluminescent polymer. Construction and working. Structure of Poly(Paraphenlylenevinylene) PPV. Poly(Paraphenlylenevinylene) PPV Preparations. Applications of poly (Paraphenlylenevinylene).

4. Definition The Property in which a material produces bright light of different colours when stimulated electronically is known as electroluminescence ,is called as electroluminescent material. Various organic polymeric material materials are now discovered which act as self emitting device of high brightness , high efficiency, direct current low voltage operation , high speed response , no heat and long life.

5. Construction And Working The organic electroluminescent device consist of a transport anode , hole transport layer , emitter layer of organic polymeric material and a cathode Al-Mg alloy , stacked upon a glass support. Working: The Anode injects a hole towards transport layer then an electron is injected by cathode layer into the emitter layer . Then the hole and electron recombine in the emitter layer to excite the emitter layer which results in emission of light, during return of excited emitter to ground state.

6. Poly (Paraphenylenevinylene) PPV Poly( p -phenylene vinylene) (PPV, or polyphenylene vinylene) is a  conducting polymer  of the  rigid-rod polymer  family. PPV is the only polymer of this type that can be processed into a highly ordered crystalline thin film. PPV and its derivatives are electrically conducting upon doping. Although insoluble in water, its precursors can be manipulated in aqueous solution. small optical band gap and its bright yellow fluorescence makes PPV a candidate in applications such as light-emitting diodes (LED) and photovoltaic devices.  Moreover, PPV can be doped to form electrically conductive materials. Its physical and electronic properties can be altered by the inclusion of functional side groups. Chemical Formula : (C 8 H 6 ) n Organic Name: poly(1,4-phenylene-1,2-ethenediyl) Appearance: Yellow Solid Solubility: Insoluble in water

7. Preparation PPV is conveniently prepared from from precursor polymer poly ( α -n- octyl sulphinyl paraphenylene ethylene) by heating in vaccum . Elimination of n- octylthiol introduces the double bonds in the chain . Usually PPV is used as mixture with (6,6) phenyl C 60 - Butyric acid methyl ester (PCBM) for applications. It is also prepared by chemical vapour deposition of dichloro p=xylene at 500-700 C Its is also prepared by chemical vapour deposition of dichloro p-xylene at 500-700 C Precursor polymer: A  precursor  is a  compound  that participates in a  chemical reaction  that produces another compound.

8. Applications Of Poly (Paraphenylenevinylene) In the form of thin films for information displays Automotive instrument panel background Backlight for liquid crystal displays Electroluminescence night lamp Long life , full colour displays flat panel displays Photovoltaic cells Theatre , assembly hall decoration Arrow light decoration Light stripes for decorating building and vehicle safety presentation.

9. Electroluminescence night lamp Automotive instrument panel background Backlight for liquid crystal displays Arrow light decoration Light stripes for decorating building Theatre , assembly hall decoration