By courtesy of:
Emil J. W. List,* Roland Guentner, Patricia Scanducci de Freitas, and Ullrich Scherf
Adv. Mater. 2002, 14, 374
And a recent review:
Semiconducting Polyfluorenes – Towards reliable Structure-Property Relationships
Ullrich Scherf* and Emil J. W. List*
Adv. Mater. 2002, 14, 477
More versatile one:
Polyphenylene-type Emissive Materials: Poly(para-phenylene)s, Polyfluorenes, and Ladder PolymersAndrew C. Grimsdale · Klaus Müllen
Adv Polym Sci (2006) 199: 1–82
and the newest improvement:
Spiro-Bridged Ladder-Type Poly(p-phenylene)s: Towards Structurally Perfect Light-Emitting Materials
Yonggang Wu, Jianyuan Zhang, Zhuping Fei, and Zhishan Bo*
JACS 2008, 130, 7192–7193