Polymer Bulletin

, Volume 68, Issue 8, pp 2131–2144 | Cite as

Star-branched cationic light-emitting dot with silsesquioxane core, synthesis, and light scattering studies

  • Yang Xiao
  • Khine Y. Mya
  • Beng H. Tan
  • Chao B. He
Original Paper


Novel star-like hydrophobic (M) and hydrophilic (W) hybrid light-emitting dots were synthesized by grafting conjugated arms at eight vertexes of polyhedral oligomeric silsesquioxane (POSS) cage. The water-soluble cationic polymer W contains POSS as a core and two layers shell—an inner layer shell consists of the conjugated organic chain and a long chain of hydrophilic polymer as outer layer shell for solubilization in water. The 3D structure renders non-aggregation properties of W in solution as the wavelength for the absorption and luminescence spectra remains unchanged over different concentrations. The effects of ionic strength and pH on the properties of cationic polymer W were studied using UV, dynamic- and static-light scattering (DLS and SLS).


Silsesquioxane Light-emitting Dot Cationic Water soluble Light scattering 


  1. 1.
    Liu B, Bazan GC (2006) Synthesis of cationic conjugated polymers for use in label-free DNA microarrays. Nat Protoc 1:1698–1702CrossRefGoogle Scholar
  2. 2.
    Liu Y, Ogawa K, Schanze KS (2009) Conjugated polyelectrolytes as fluorescent sensors. J Photoch Photobio C 10:173–190CrossRefGoogle Scholar
  3. 3.
    Chen SA, Jen TH, Lu HH (2010) A review on the emitting species in conjugated polymers for photo- and electro-luminescence. J Chin Chem Soc-Taip 57:439–458CrossRefGoogle Scholar
  4. 4.
    McQuade DT, Pullen AE, Swager TM (2000) Conjugated polymer-based chemical sensors. Chem Rev 100:2537–2574CrossRefGoogle Scholar
  5. 5.
    Stork M, Gaylord BS, Heeger AJ, Bazan GC (2002) Energy transfer in mixtures of water-soluble oligomers: effect of charge, aggregation, and surfactant complexation. Adv Mater 14:361–366CrossRefGoogle Scholar
  6. 6.
    Cimrova V, Schmidt W, Rulkens R, Schulze M, Meyer W, Neher D (1996) Efficient blue light emitting devices based on rigid-rod polyelectrolytes. Adv Mater 8:585CrossRefGoogle Scholar
  7. 7.
    Baur JW, Kim S, Balanda PB, Reynolds JR, Rubner MF (1998) Thin-film light-emitting devices based on sequentially adsorbed multilayers of water-soluble poly(p-phenylene)s. Adv Mater 10:1452–1455CrossRefGoogle Scholar
  8. 8.
    Lin WJ, Chen WC, Wu WC, Niu YH, Jen AKY (2004) Synthesis and optoelectronic properties of starlike polyfluorenes with a silsesquioxane core. Macromolecules 37:2335–2341CrossRefGoogle Scholar
  9. 9.
    Kang JM, Cho HJ, Lee J, Lee JI, Lee SK, Cho NS, Hwang DH, Shim HK (2006) Highly bright and efficient electroluminescence of new PPV derivatives containing polyhedral oligomeric silsesquioxanes (POSSs) and their blends. Macromolecules 39:4999–5008CrossRefGoogle Scholar
  10. 10.
    He CB, Xiao Y, Huang JC, Lin TT, Mya KY, Zhang XH (2004) Highly efficient luminescent organic clusters with quantum dot-like properties. J Am Chem Soc 126:7792–7793CrossRefGoogle Scholar
  11. 11.
    Xiao Y, Liu L, He CB, Chin WS, Lin TT, Mya KY, Huang JC, Lu XH (2006) Nano-hybrid luminescent dot: synthesis, characterization and optical properties. J Mater Chem 16:829–836CrossRefGoogle Scholar
  12. 12.
    Xiao Y, Tripathy S, Lin TT, He CB (2006) Absorption and Raman study for POSS-oligophenylene nanohybrid molecules. J Nanosci Nanotechnol 6:3882–3887CrossRefGoogle Scholar
  13. 13.
    Xiao Y, Lu XH, Tan LW, Ong KS, He CB (2009) Thermally stable red electroluminescent hybrid polymers derived from functionalized silsesquioxane and 4,7-bis(3-ethylhexyl-2-thienyl)-2,1,3-benzothiadiazole. J Polym Sci Pol Chem 47:5661–5670CrossRefGoogle Scholar
  14. 14.
    Xiao Y, Lu XH, Zhang XH, He CB (2010) Synthesis and optical characteristics of organic light-emitting dot based on well-defined octa-functionalized silsesquioxane. J Nanopart Res 12:2787–2798CrossRefGoogle Scholar
  15. 15.
    Brown W (1996) Light scattering: principles and development. Clarendon Press, OxfordGoogle Scholar
  16. 16.
    Radeva T (2001) Physical chemistry of polyelectrolytes 99. Marcel Dekker, Inc., New YorkGoogle Scholar
  17. 17.
    Lu S, Fan QL, Chua SJ, Huang W (2003) Synthesis of conjugated—ionic block copolymers by controlled radical polymerization. Macromolecules 36:304–310CrossRefGoogle Scholar
  18. 18.
    Kim J, Swager TM (2001) Control of conformational and interpolymer effects in conjugated polymers. Nature 41:1030–1034CrossRefGoogle Scholar
  19. 19.
    Levitus M, Schmieder K, Ricks H, Shimizu KD, Bunz UHF, Garcia-Garibay MA (2001) Steps to demarcate the effects of chromophore aggregation and planarization in poly(phenyleneethynylene)s. 1. Rotationally interrupted conjugation in the excited states of 1,4-bis(phenylethynyl)benzene. J Am Chem Soc 123:4259–4265CrossRefGoogle Scholar
  20. 20.
    Walters KA, Ley KD, Schanze KS (1999) Photophysical consequences of conformation and aggregation in dilute solutions of pi-conjugated oligomers. Langmuir 15:5676–5680CrossRefGoogle Scholar
  21. 21.
    Odijk T (1979) Possible scaling relations for semidilute polyelectrolyte solutions. Macromolecules 12:688–693CrossRefGoogle Scholar
  22. 22.
    Huglin MB (1972) Light scattering from polymer solutions. Academic Press, LondonGoogle Scholar
  23. 23.
    Smith AD, Shen CKF, Roberts SR, Helgeson R, Schwartz BJ (2007) Ionic strength and solvent control over the physical structure, electronic properties and superquenching of conjugated polyelectrolytes. Res Chem Intermed 33:125–142CrossRefGoogle Scholar

Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  • Yang Xiao
    • 1
  • Khine Y. Mya
    • 1
  • Beng H. Tan
    • 1
  • Chao B. He
    • 1
    • 2
  1. 1.Institute of Materials Research and Engineering (IMRE) Agency for Science, Technology and Research (A*STAR)SingaporeSingapore
  2. 2.Department of Materials Science and EngineeringNational University of SingaporeSingaporeSingapore

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