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Proceedings Paper

Electroluminescence as a probe for electrical and optical properties of deoxyribonucleic acid
Author(s): Tamami Koyama; Yutaka Kawabe; Naoya Ogata
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Paper Abstract

Several class of dyes doped in deoxyribonucleic acid (DNA) derived from salmon show enhancement of fluorescence due to suppression of molecular aggregation. Also, some recent studies support electric conduction in DNA strands. Combination of these properties suggests the possibility to develop organic LED devices (OLED) based on biopolymer systems. Furthermore, the electroluminescence (EL) effect can be employed as a probe for electrical and optical properties of DNA. We fabricated OLED devices based on DNA- lipid complex and dopant dyes (ethidium bromide and fluorescein). Devices are composed of hole injection layer, dye-doped DNA-lipid layer and electrodues. OLED with ethidium bromide doped DNA showed LED emission under DC bias, but the origin of the emission was tris-(8- hydroxyquinolinato)aluminum(III)(Alq3) which was employed as an electron transporter. The current-voltage characteristics of the devices show apparent rectification behavior. From these experimental results, it is confirmed that DNA transports hole current under external DC bias. When employing fluorescein as a dopant in DNA and fabricating the devices without Alq3 layer, we observed emission from the dyes incorporated in DNA. Although the origins of the emission centers in spectra are not clear, it shows that the DNA-lipid complex will be basically applicable to OLED if additional improvements are made.

Paper Details

Date Published: 27 February 2002
PDF: 8 pages
Proc. SPIE 4464, Organic Light-Emitting Materials and Devices V, (27 February 2002); doi: 10.1117/12.457483
Show Author Affiliations
Tamami Koyama, Chitose Institute of Science and Technology (Japan)
Yutaka Kawabe, Chitose Institute of Science and Technology (Japan)
Naoya Ogata, Chitose Institute of Science and Technology (Japan)

Published in SPIE Proceedings Vol. 4464:
Organic Light-Emitting Materials and Devices V
Zakya H. Kafafi, Editor(s)

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