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Proceedings Paper

Synthesis of side-chain electroluminescent polymers and properties of devices that include them
Author(s): Pierre L. Le Barny; Cecile-Maria Bouche; Hugues Facoetti; Francoise Soyer; Philippe Robin
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Paper Abstract

A series of 4-aminonaphthalimide functionalized polymers has been synthesized. They differ by the nature of their backbone: and by the nature of the substituent at the imide nitrogen atom. The absorption and emission properties of these polymers have been investigated. Photoluminescence quantum yields in the solid state up to 35 percent were observed. Cyclic voltammetry in conjunction with UV-visible spectrometry have been performed in order to determine the HOMO and LUMO energy levels of the different materials. Electroluminescent devices were fabricated with these polymers as emitting layers, and ITO and Ca as anode and cathode, respectively. Monolayer devices showed a limited performance. Efficient green light emission was obtained with a bilayer device based on PVK as a hole transport material and a polystyrene derivative as an emitting layer. A maximum luminance of 7100cd/m2 was obtained under 16V. The device had a maximum external quantum efficiency of 1 percent and a maximum external energetic efficiency of 0.2 percent. Doping PST-NI-BuP with 20 percent DCM resulted in red-orange emission with a brightness as high as 1800 cd/m2. Doping PST-NI-BuP with 20 percent DCM resulted in red-orange emission with a brightness as high as 1800 cd/m2. Moreover, this study showed a strong influence of the chemical environment of the naphthalimide moiety on the photoluminescence and electroluminescent properties of the polymers.

Paper Details

Date Published: 1 December 1997
PDF: 10 pages
Proc. SPIE 3148, Organic Light-Emitting Materials and Devices, (1 December 1997); doi: 10.1117/12.284172
Show Author Affiliations
Pierre L. Le Barny, Thomson-CSF (France)
Cecile-Maria Bouche, Thomson-CSF (France)
Hugues Facoetti, Thomson-CSF (France)
Francoise Soyer, Thomson-CSF (France)
Philippe Robin, Thomson-CSF (France)

Published in SPIE Proceedings Vol. 3148:
Organic Light-Emitting Materials and Devices
Zakya H. Kafafi, Editor(s)

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