CdSe/ZnS Nanoparticle Composites with Amine-Functionalized Polyfluorene Derivatives for Polymeric Light-Emitting Diodes: Synthesis, Photophysical Properties, and the Electroluminescent Performance

• Published in: Macromolecules Vol. 43; no. 4; pp. 1860 - 1866
• Main Authors: Guo, Zeng-Shan, Zhao, Lihua, Pei, Jian, Zhou, Zhang-Lin, Gibson, Gary, Brug, James, Lam, Sity, Mao, Samuel S
• Format: Journal Article
• Language: English
• Published: Washington, DC American Chemical Society 23.02.2010
• Subjects: Applied sciences; Composites; Electronics; Exact sciences and technology; Forms of application and semi-finished materials; Optoelectronic devices; Polymer industry, paints, wood; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; Technology of polymers; Quantum dot; Solution polycondensation; Photoluminescence; Excitation energy transfer; Electroluminescence; Experimental study; Functional polymer; Polymer filler interaction; Suzuki coupling; Zinc sulfide; Electrochemical properties; Conjugated copolymer; Optical properties; Preparation; Luminescence quenching; Copolycondensation; Aromatic copolymer; Organic light emitting diodes; Nanocomposite; Cadmium Selenides; Fluorene derivative copolymer; Amine copolymer
• ISSN: 0024-9297; 1520-5835
• DOI: 10.1021/ma902573d

A series of amine-functionalized poly(9,9-dihexylfluorene) (PFH) derivatives, PFH-NH 2 F-39-1 (P1), PFH-NH 2 F-19-1 (P2), PFH-NH 2 F-9-1 (P3), and PFH-NH 2 F-17-3 (P4), and PFH-NH 2 F-4-1 (P5), were developed to form organic/inorganic hybrid composites with CdSe/ZnS nanoparticle for polymeric light-emitting diodes (LEDs). The structures and purities of all desired polymers were fully characterized by 1H and 13C NMR, UV−vis and photoluminescent spectroscopy, gel permeation chromatography, elemental analyses. The hybrid nanocomposites were in situ formed through these amino-functionalized polyfluorene derivatives doped with core−shell CdSe/ZnS quantum dots (QDs). The detailed characterizations of their photophysical properties revealed that rapid Förster energy transfer from the conjugated polymers to the red-emitting QDs afforded an efficient red color emission. The preliminary polymeric LEDs fabrication with the configuration of ITO/DB/nanocomposites/Al achieved red emission for the in situ prepared hybrid nanocomposites. The investigation of device performance indicates that these nanocomposites are promising red light-emitting polymeric LED materials with good performance in providing excellent color purity, stability, and robustness. Such strategy provides us a platform to achieve red-emitting hybrid nanocomposites as the active materials for LEDs.