Polymer fluorescence: even-parity states, alternation, and heteroatoms

Zoltan G. Soos; Douglas S. Galvao; Shahab Etemad

doi:10.1117/12.177222

2 June 1994 Polymer fluorescence: even-parity states, alternation, and heteroatoms

Zoltan G. Soos, Douglas S. Galvao, Shahab Etemad

Proceedings Volume 2144, Advanced Photonics Materials for Information Technology; (1994) https://doi.org/10.1117/12.177222
Event: OE/LASE '94, 1994, Los Angeles, CA, United States

Abstract

Polymer fluorescence indicates a lowest singlet excitation S₁ of odd parity, while an even-parity S₁ favors radiationless decay. The optical gap E_g defines the lowest odd-parity singlet, 1¹B_u, and the two-photon gap E_a fixes the 2¹A_g state. The 1B/2A ordering of conjugated polymers reflects different single-particle gaps, 4t(delta) for alternating chains, at nearly constant correlations. Topological and heteroatom contributions to the effective alternation of poly-p- phenylenevinylenes and polythiophenes are discussed, polymer spectra is analyzed in terms of molecular (pi) -electron theory. Even-parity states at E_a and biexcitons derived from two- electron excitation across E_g indicate intermediate correlations and alternations, thereby limiting the accuracy of band, strong-correlation, and large-(delta) descriptions. Correlated states in the dimer limit illustrate the 2A/1B crossover of Hubbard or excitonic systems.

Citation Download Citation

Zoltan G. Soos, Douglas S. Galvao, and Shahab Etemad "Polymer fluorescence: even-parity states, alternation, and heteroatoms", Proc. SPIE 2144, Advanced Photonics Materials for Information Technology, (2 June 1994); https://doi.org/10.1117/12.177222

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