Star-like polyfluorenes based on 2,4,6,8, 10,12-hexabenzyl-2,4,6,8,10,12-hexaazaisowurtzitane caged-core: toward non-aggregating, blue-light-emitting polymers

Multi-functionality compound 2,4,6,8,10,12-hexa(p-bromo)-benzyl-2,4,6,8,10,12-hexaazaiso-wurtzitane (Br-HBIW) was synthesized and used for the core of star-like polymers. Star-like polyfluorene based on 2,4,6,8,10,12-hexabenzyl-2,4,6,8,10,12-hexaazaisowurtzitane (HBIW) caged-core was synthesized by Suzuki coupling method. The comparative studies between the star-like polyfluorene and the linear polyfluorene based on UV–Vis and photoluminescence (PL) spectra revealed that the bulky HBIW cage could reduce the chain aggregation and π–π interaction, so brought about improved PL quantum efficiency and annealing PL stability. Such results could be owed to the successful suppression of excimers formation, which originated from the incorporation of the HBIW cage and star-like architecture. Copyright © 2009 John Wiley & Sons, Ltd.

[1]  X. Jing,et al.  Synthesis and characterization of color‐stable electroluminescent polymers: Poly(dinaphtho[1,2‐a:1′,2′‐g]‐s‐indacene)s , 2008 .

[2]  A. Jen,et al.  High-Efficiency and Color Stable Blue-Light-Emitting Polymers and Devices† , 2007 .

[3]  Wei Wei,et al.  Spectrum-stable hyperbranched polyfluorene with photocrosslinkable group , 2007 .

[4]  Chung-Wen Wu,et al.  Synthesis and Characterization of Kinked and Hyperbranched Carbazole/Fluorene-Based Copolymers , 2006 .

[5]  Tianxi Liu,et al.  Photophysical properties and morphology of fluorene-alt-benzene based conjugated polymers† , 2006 .

[6]  Hong-Cheu Lin,et al.  Synthesis and characterization of poly(fluorene)-based copolymers containing various 1,3,4-oxadiazole dendritic pendants , 2006 .

[7]  Wenyong Lai,et al.  Monodisperse Six-Armed Triazatruxenes: Microwave-Enhanced Synthesis and Highly Efficient Pure-Deep-Blue Electroluminescence , 2006 .

[8]  Jianwei Xu,et al.  A Comparative Study on Luminescent Copolymers of Fluorene and Carbazole with Conjugated or δ-Si Interrupted Structures: Steric Effects , 2006 .

[9]  Yunqi Liu,et al.  Porphyrin-cored star polymers as efficient nondoped red light-emitting materials , 2006 .

[10]  S. Chua,et al.  Polyfluorene-Based Light-Emitting Rod-Coil Block Copolymers , 2005 .

[11]  R. Laine,et al.  Robust Polyaromatic Octasilsesquioxanes from Polybromophenylsilsesquioxanes, BrxOPS, via Suzuki Coupling , 2005 .

[12]  C. Shu,et al.  Enhancing the thermal and spectral stabilities of polyfluorene-based blue-light-emitting materials by incorporating pendent spiro-cycloalkyl groups , 2004 .

[13]  A. Jen,et al.  Synthesis and Optoelectronic Properties of Starlike Polyfluorenes with a Silsesquioxane Core , 2004 .

[14]  Zhishan Bo,et al.  Porphyrins with four monodisperse oligofluorene arms as efficient red light-emitting materials. , 2004, Journal of the American Chemical Society.

[15]  Byung-Jun Jung,et al.  Synthesis and characterization of thermally stable blue light-emitting polyfluorenes containing siloxane bridges , 2003 .

[16]  S. Beaupré,et al.  Synthesis and characterization of a novel polyester derived from substituted terfluorene , 2000 .

[17]  Richard D. McCullough,et al.  Employing MALDI-MS on Poly(alkylthiophenes): Analysis of Molecular Weights, Molecular Weight Distributions, End-Group Structures, and End-Group Modifications , 1999 .

[18]  Donal D. C. Bradley,et al.  Interplay of Physical Structure and Photophysics for a Liquid Crystalline Polyfluorene , 1999 .

[19]  Arno Kraft,et al.  Electroluminescent Conjugated Polymers-Seeing Polymers in a New Light. , 1998, Angewandte Chemie.

[20]  Yang Yang,et al.  Efficient Photoluminescence and Electroluminescence from a Soluble Polyfluorene , 1996 .

[21]  Keiro Muro,et al.  Blue Electroluminescent Diodes Utilizing Poly(alkylfluorene) , 1991 .

[22]  C. L. Coon,et al.  Polyazapolycyclics by condensation of aldehydes with amines. 2. Formation of 2,4,6,8,10,12-hexabenzyl-2,4,6,8,10,12-hexaazatetracyclo[5.5.0.05.9.03,11]dodecanes from glyoxal and benzylamines , 1990 .