Polarized photoluminescence from solid films of nematic and chiral-nematic poly(p-phenylene)s

D. Katsis*, Huang-Ming Chen, S. H. Chen, L. J. Rothberg, T. Tsutsui

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

Thermotropic nematic and chiral-nematic poly(p-phenylene)s were prepared into well-aligned films between fused-silica substrates in which conjugated backbones were uniaxially and helically oriented. With unpolarized photoexcitation at 350 nm, a nematic film produced a degree of linear polarization of 9 near the emission peak at 410 nm with no evidence of excimer formation. With the same photoexcitation of a chiral-nematic film, the degree of circular polarization was found to vary from -1.3 in the 390-430 nm spectral region to between +0.3 and +0.9 beyond the edge of the selective reflection band. The crossover behavior unique to light emission from the selective reflection region remains inexplicable with existing theories on light propagation through periodically structured films.

Original languageEnglish
Pages (from-to)2982-2984
Number of pages3
JournalApplied Physics Letters
Volume77
Issue number19
DOIs
StatePublished - 6 Nov 2000

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