On the use of optical probes to monitor the thermal transitions in spin-coated poly(9,9-dioctylfluorene) films

  • Sims M
  • Zheng K
  • Quiles M
 et al. 
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We report on the use of optical probes to determine the thermal transition
temperatures of spin-coated films of the prototypical fluorene based
conjugated polymer poly(9,9-dioctylfluorene) (PFO). In particular
we focus here on the use of temperature dependent photoluminescence
(PL) measurements that are well suited to the study of PFO and other
intrinsically fluorescent polymers and blends. The integrated PL
intensity reveals clear signatures of the glass transition temperature
( T g ), the onset of crystallization ( T c ) and subsequent melting
into the nematic liquid crystalline mesophase ( T m ). The PL intensity
determined transitions are shown to be consistent with an independent
optical probe, namely spectroscopic ellipsometry, and with differential
scanning calorimetry measurements on bulk samples. The especially
strong contrast in PL intensity at T c and T m is shown to be a consequence
of changes in light out-coupling in the direction of PL detection,
a conclusion that is confirmed by measurements of edge emitted waveguided
PL and amplified spontaneous emission, and by analysis of ellipsometry

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  • M. Sims

  • K. Zheng

  • M. Campoy Quiles

  • R. Xia

  • P. N. Stavrinou

  • D. D.C. Bradley

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