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Proceedings Paper

White emission from a single-component single-layer solution processed OLED
Author(s): Carmen Coya; Maria M. Ramos; Xenia Luna; Angel Luis Álvarez; Alicia de Andrés; Raúl Blanco; Rafael Juárez; Rafael Gómez; Jose Luis Segura
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Paper Abstract

We report white electroluminescence from a single component-single layer solution processed organic light emitting diodes (OLEDs). In this work, we have fabricated and characterized OLEDs based on a single polymer synthesized by incorporating a small amount of the orange-light emitting chromophore 1,8-Naphtalimide derivative as side chain to poly(fluorene-alt-phenylene) (PFP). The structure of the devices is ITO/PEDOT:PSS/Active layer/Al. The dopant unit was convalenttly attached to the side chain of polyfluorene by alkyl spacers. We have fabricated devices with different amounts of the orange chromophore (0, 0.0005, 0.005, 0.02 and 0.08 in weight) as well as a device based on a physical blend in the same proportion of 0.08 for comparison purposes. Absorption and Photoluminescence (PL) studies in thin films show no significant interaction can be observed between both moieties in the ground state, but after photoexcitation an efficient energy transfer takes place from PFP to the orange chromophore. We have observed a more efficient energy transfer in these compounds than for physical mixtures of the two chromophores due to a phase separation effect in the blend confirmed by the optical measurements and ESEM analysis, obtaining energy transfer even in diluted solutions from the intramolecular interaction in the copolymers. With this very simple device structure, white light with Commission Internationale de l'Eclairage (CIE) coordenates (0.34;0.43) is obtained for the electroluminescence (EL) emission and turn on voltage of 6 V for the device based on the copolymer with x = 0.02, together with a good match in the EL and PL spectra indicative that two emissions are produced by the same species, making this material very suitable for large area solution processed devices in solid state illumination.

Paper Details

Date Published: 27 August 2009
PDF: 12 pages
Proc. SPIE 7415, Organic Light Emitting Materials and Devices XIII, 74151P (27 August 2009); doi: 10.1117/12.826001
Show Author Affiliations
Carmen Coya, Univ. Rey Juan Carlos (Spain)
Maria M. Ramos, Univ. Rey Juan Carlos (Spain)
Xenia Luna, Univ. Rey Juan Carlos (Spain)
Angel Luis Álvarez, Univ. Rey Juan Carlos (Spain)
Alicia de Andrés, Consejo Superior de Investigaciones Científicas (Spain)
Raúl Blanco, Univ. Complutense de Madrid (Spain)
Rafael Juárez, Univ. Rey Juan Carlos (Spain)
Univ. Complutense de Madrid (Spain)
Rafael Gómez, Univ. Complutense de Madrid (Spain)
Jose Luis Segura, Univ. Complutense de Madrid (Spain)

Published in SPIE Proceedings Vol. 7415:
Organic Light Emitting Materials and Devices XIII
Franky So; Chihaya Adachi, Editor(s)

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