Influence of electric field on the photoluminescence of a liquid crystalline monosubstituted polyacetylene

Huang, Yuan Ming; Ge, Weikun; Lam, Jacky W. Y.; Tang, Ben Zhong
March 2001
Applied Physics Letters;3/19/2001, Vol. 78 Issue 12, p1652
Academic Journal
It has been shown recently that strong photoluminescence (PL) can occur in monosubstituted polyacetylenes (PAs). In this letter, we investigate the PL of tetrahydrofuran solutions of a highly luminescent liquid crystalline PA, poly(11-{[4′-heptoxy-4-biphenylyl)carbonyl]oxy}-1-undecyne) (PBU), under the influence of direct current electric fields. The applied electric fields can dramatically tune the PL structures of a moderately concentrated PBU solution (∼11.3 mM) at and above an electric field threshold of about 3x10[sup 5] V/m. Combined with the director simulations, our results indicate that the electrically induced molecular reorientation and intermolecular interaction are responsible for the observed spectral changes. © 2001 American Institute of Physics.


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