Synthesis and characterisation of polyfluorenes with light-emitting segments

• Published in: Synthetic metals Vol. 121; no. 1; pp. 1761 - 1762
• Main Authors: Johansson, D.M., Granlund, T., Theander, M., Inganäs, O., Andersson, M.R.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Lausanne Elsevier B.V 15.03.2001; Amsterdam Elsevier Science; New York, NY
• Subjects: Applied sciences; Exact sciences and technology; Lasers; Organic polymers; Photoluminescence; Physicochemistry of polymers; Polyfluorene and derivatives; Polymers with particular properties; Preparation, kinetics, thermodynamics, mechanism and catalysts; Synthesis; TECHNOLOGY; TEKNIKVETENSKAP; UV-Vis-NIR absorption; Phenylene derivative copolymer; Wittig reaction; Solution polycondensation; Phenylenevinylene derivative copolymer; Photoluminescence; Arylene copolymer; Threshold energy; Experimental study; Quantum yield; Conjugated copolymer; Optical properties; Preparation; Fluorene derivatives; Fluorene derivative copolymer
• ISSN: 0379-6779; 1879-3290; 1879-3290
• DOI: 10.1016/S0379-6779(00)00684-6

We present the synthesis and characterisation of two copolymers. They consists of poly(9-hexyl-9-(2'-ethylhexyl)fluorene) (HEH-PF) with a small amount of another polymer with a narrow band-gap. The synthetic route was designed to allow the incorporation of only one low band-gap segment per polymer chain. Photoluminescence measurements showed that energy transfer from the PF-segments to the low band-gap segments, did occur. In the solid state, all emissions were detected from the low band-gap segments with photoluminescence quantum yields up to 68%. One copolymer showed a low threshold for lasing (2 µJ/cm2) in a microcavity device.