+ (1 - The Hong Kong Polytechnic University

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+ (1 - The Hong Kong Polytechnic University

The PFO β-Phase Conformation

• Under certain processing conditions a new red-shifted peak contributes to the

absorption

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1.0

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Absorbance (a.u.)

0.8

0.6

0.4

0.2

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0.0

320 360 400 440 480

Wavelength (nm)

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A fraction of chains adopt a well-defined, extended, rigid structure

Bradley et al Proc. SPIE 3145 (1997) 254; Grell et al Acta Polym. 49 (1998) 439; Grell et al Macromol. 32 (1999), 5810; Ariu et al Phys.Rev.B67 (2003) 195333

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