Mobility enhancement through homogeneous nematic alignment of a liquid-crystalline polyfluorene

Applied Physics Letters

Volumn 74, Issue 10, 1999, Pages 1400-1402

  Redecker, M ^a   Bradley, D D C ^a   Inbasekaran, M ^b   Woo, E P ^b  

^a UNIVERSITY OF SHEFFIELD   (United Kingdom)

^b DOW CHEMICAL COMPANY   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 0000757327     PISSN: 00036951     EISSN: None     Source Type: Journal    
DOI: 10.1063/1.123563     Document Type: Article

References (21)

1. H. Sirringhaus, N. Tessler, and R. H. Friend, Science 280, 1741 (1998).
2. C. W. Tang, Appl. Phys. Lett. 48, 183 (1986).
3. J. H. Burroughes, D. D. C. Bradley, A. R. Brown, R. N. Marks, K. Mackay, R. H. Friend, P. L. Burn, and A. B. Holmes, Nature (London) 347, 539 (1990).
4. A. J. Campbell, D. D. C. Bradley, and D. G. Lidzey, J. Appl. Phys. 82, 6326 (1997).
5. D. Adam, P. Schuhmacher, J. Simmerer, L. Häussling, K. Siemensmeyer, K. H. Etzbach, H. Ringsdorf, and D. Haarer, Nature (London) 371, 141 (1994).
6. M. Funahashi and J. I. Hanna, Appl. Phys. Lett. 71, 602 (1997).
7. M. Funahashi and J. Hanna, Phys. Rev. Lett. 78, 1284 (1997).
8. H. Tokuhisa, M. Era, and T. Tsutsui, Appl. Phys. Lett. 72, 2639 (1998).
9. T. Christ, V. Stümpflen, and J. H. Wendorff, Macromol. Rapid Commun. 18, 93 (1997).
10. F. Cacialli, R. Daik, P. Dounis, W. J. Feast, R. H. Friend, N. D. Haylett, C. P. Jarrett, C. Schönenberger, J. A. Stephens, and G. Widawski, Philos. Trans. R. Soc. London, Ser. A 355, 707 (1997).
11. A. Grice, D. D. C. Bradley, M. T. Bernius, M. Inbasekaran, W. W. Wu, and E. P. Woo, Appl. Phys. Lett. 73, 629 (1998).
12. M. Grell, D. D. C. Bradley, M. Inbasekaran, and E. P. Woo, Adv. Mater. 9, 798 (1997).
13. M. Redecker, D. D. C. Bradley, M. Inbasekaran, and E. P. Woo, Appl. Phys. Lett. 73, 1565 (1998).
14. S. Janietz, D. D. C. Bradley, M. Grell, M. Inbasekaran, and E. P. Woo, Appl. Phys. Lett. 73, 2453 (1998).
15. M. Grell, D. D. C. Bradley, X. Long, T. Chamberlain, M. Inbasekaran, and E. P. Woo, Acta Polym. 49, 439 (1998).
16. N. Miyaura and A. Suzuki, Chem. Rev. 95, 2457 (1995).
17. The 30 nm thickness is some 10 nm less than that recommended by the manufacturer as the minimum required to ensure good electrical insulation properties. Our previous experience has shown that this thickness is sufficient to achieve good alignment. Structures made with a 30 nm thickness polyimide layer on an ITO substrate and with an electron injection cathode (e.g., aluminum) function as LEDs indicating that carriers do transport between the ITO substrate and the aligned PFO film. The details of this process are under more detailed investigation.
18. The time required for alignment was estimated by extrapolation from alignment studies performed on films of thickness 50 nm.
19. H. Bässler, Phys. Status Solidi B 175, 15 (1993).
20. P. M. Borsenberger, L. Pautmeier, and H. Bässler, J. Chem. Phys. 94, 5447 (1991).
21. D. Hertel, U. Scherf, and H. Bassler, Adv. Mater. 10, 1119 (1998).