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Title: Yellow-green organic light emitting diodes based on poly (p-phenylene vinylene)/CdS heterojunction thin films
Authors: Kumar, Lokendra
Dhawan, S K
Kumar, Mahesh
Kamalasanan, M N
Chandra, Subhas
Keywords: Heterojunction thin films;Electroluminescent materials;p-phenylenevinylene;Organic light emitting diodes
Issue Date: Aug-2003
Publisher: NISCAIR-CSIR, India
Abstract: Thin film electro- luminescent devices based on organic materials are very popular for organic light emitting diodes (OLEDs) fabrication. The authors have polymerized PPV precursor solution from p-Xylenebis (tetrahydrothiophenium chloride) salt. Thin films of PPV were prepared by spin-coating, the precursor onto ITO substrates and curing it at 220°C in the absence of oxygen. Organic light emitting diode structures were fabricated using ITO as the bottom electrode, PPV as an emitter layer as well as hole transport layer, CdS as an electron transport layer and aluminium as the cathode. In this contiguration, CdS pro vides the advantage of excellent charge-transporting properties of an inorganic semiconductor. Electro-luminescence spectrum obtained from this hetero-junction device was similar to the emission spectrum of PPV. The devices give bright greenish-yellow electro-luminescence on application of about 10V under forward biased condition.
Page(s): 641-645
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Appears in Collections:IJPAP Vol.41(08) [August 2003]

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