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Chin. Phys. B, 2019, Vol. 28(7): 076101    DOI: 10.1088/1674-1056/28/7/076101
CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES Prev   Next  

Control on β conformation of poly(9,9-di-n-octylfluorene) via solvent annealing

Zhi Chao Zhang(张志超)1, Bing Yue Zhang(张丙悦)1, Yu Yan Weng(翁雨燕)1,2, Tian Hui Zhang(张天辉)1
1 Center for Soft Condensed Matter Physics and Interdisciplinary Research and College of Physics, Soochow University, Suzhou 215006, China;
2 National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China
Abstract  

Films of poly(9,9-dioctylfluorene) (PFO) are of great importance in fabricating light emitting diodes. In practice, the β-phase of PFO is expected due to its high efficiency in the transport of charge carrier. To promote the formation of β-phase, PFO films are immersed and annealed in the mixture of solvent/nonsolvent. The effects of temperature, solvent/nonsolvent ratio, and annealing time are examined systematically. It is found that the fraction of β-phase can be highly improved by increasing the ratio of solvent/nonsolvent. The reconfiguration of PFO molecules for β-phase in annealing is generally finished in 10 min. The finding in this study demonstrates that solvent-assisted annealing offers a fast and economic approach for mass annealing.

Keywords:  organic crystal      conjugated polymer      solvent annealing  
Received:  25 February 2019      Revised:  26 April 2019      Published:  05 July 2019
PACS:  61.82.Pv (Polymers, organic compounds)  
  61.82.Rx (Nanocrystalline materials)  
  81.40.Ef (Cold working, work hardening; annealing, post-deformation annealing, quenching, tempering recovery, and crystallization)  
Fund: 

Project supported by the National Natural Science Foundation of China (Grant Nos. 11674235, 11374218, and 21204058), the National Laboratory of Solid State Microstructures, China (Grant No. M30036), and the Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions, China.

Corresponding Authors:  Yu Yan Weng, Tian Hui Zhang     E-mail:  wengyuyan@suda.edu.cn;zhangtianhui@suda.edu.cn

Cite this article: 

Zhi Chao Zhang(张志超), Bing Yue Zhang(张丙悦), Yu Yan Weng(翁雨燕), Tian Hui Zhang(张天辉) Control on β conformation of poly(9,9-di-n-octylfluorene) via solvent annealing 2019 Chin. Phys. B 28 076101

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