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A New Approach to Design Light Emitting Devices Using Electroactive Dyes

Published online by Cambridge University Press:  11 February 2011

Michael Pan ,
Amitava Patra ,
Christopher S. Friend ,
Tzu-Chau. Lin ,
Alexander N. Cartwright ,
Paras. N. Prasad  and
Ryszard Burzynski
Michael Pan
Affiliation:
Institute for Lasers, Photonics and Biophotonics, Departments of Electrical Engineering and Chemistry, University at Buffalo, The State University of New York, Buffalo, NY 14260
Amitava Patra
Affiliation:
Institute for Lasers, Photonics and Biophotonics, Departments of Electrical Engineering and Chemistry, University at Buffalo, The State University of New York, Buffalo, NY 14260
Christopher S. Friend
Affiliation:
Institute for Lasers, Photonics and Biophotonics, Departments of Electrical Engineering and Chemistry, University at Buffalo, The State University of New York, Buffalo, NY 14260
Tzu-Chau. Lin
Affiliation:
Institute for Lasers, Photonics and Biophotonics, Departments of Electrical Engineering and Chemistry, University at Buffalo, The State University of New York, Buffalo, NY 14260
Alexander N. Cartwright
Affiliation:
Institute for Lasers, Photonics and Biophotonics, Departments of Electrical Engineering and Chemistry, University at Buffalo, The State University of New York, Buffalo, NY 14260
Paras. N. Prasad
Affiliation:
Institute for Lasers, Photonics and Biophotonics, Departments of Electrical Engineering and Chemistry, University at Buffalo, The State University of New York, Buffalo, NY 14260
Ryszard Burzynski
Affiliation:
Laser Photonics Technology, Inc., 1576 Sweet Home Road, Amherst, New York 14228
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Abstract

Organic electroluminescence (EL) single layer devices using electroactive dyes incorporated in poly-vinylcarbazole (PVK) were fabricated. The molecular structures of the two-photon dyes are the generic D-π-A;, D-π-D, and A-π-A;, structural motif, composed of a diphenylamine donor (D), a distyrylfluorene π-bridge, and an oxadiazole acceptor (A). A single layer type of EL device of ITO/PVK:DYE/Ca/Al was fabricated. The light emission peak and the threshold of the electroluminescence emission depend on the structure and concentration of the dye. The EL intensity increases with the dye concentration and it was found that as the voltage is increased the brightness increases and reaches a value 498 cd/m2 at an applied voltage of 25 V for the D-π-A; dye. We present a physical explanation of this observed behavior and show that this has significant impact on the design of light emitting devices using these organic dyes.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 734: Symposia A/B – Defect-Mediated Phenomena in Ordered Polymers – Polymer/Metal Interfaces and Defect Mediated Phenomena in Ordered Polymers , 2002 , B9.24
Copyright
Copyright © Materials Research Society 2003

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References

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