Efficient electroluminescence (EL) was observed in a new type of electroactive organic-polymer composites based on cyanine dye J-aggregates. Such systems exhibit very narrow EL emission spectra, the position of which may be varied within the green-red range, by modifying the molecular structure of the dyes.
Eugene I. Mal'tsev, Dmitry A. Lypenko, Boris I. Shapiro, Alek R. Tameev, Vladimir V. Bobinkin, Jeff Wright, Anatoly V. Vannikov, "Electroluminescence in Polymer/J-Aggregate Nanocomposites" in Proc. IS&T Int'l Conf. on Digital Printing Technologies (NIP16), 2000, pp 326 - 329, https://doi.org/10.2352/ISSN.2169-4451.2000.16.1.art00086_1