Conjugated polymer fluorescence: Interplay of correlations and alternation

Conference · Fri Dec 31 04:00:00 EST 1993

OSTI ID:10129880

Soos, Z G ^[1]; Galvao, D S ^[2]; Etemad, S ^[2]; Kepler, R G ^[3]

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1. Princeton Univ., NJ (United States). Dept. of Chemistry
2. Bell Communications Research, Inc., Red Bank, NJ (United States)
3. Sandia National Labs., Albuquerque, NM (United States)

Conjugated polymers can have high conductivity on doping, large nonlinear optical response in semiconducting state, and be used as LEDs. These polymers include polyactylene, polydiacetylenes, polysilanes, polythiophene, poly-p-phenylenevinylene. Polymer fluorescence is related to the lowest singlet excited state S{sub 1}. Polymer and oligomer data are shown for the excitation energy ratio of the two-photon and one-photon gaps. There is a ratio crossover with increasing e-e correlations in any centrosymmetri chain with an insulating ground state. The {pi}-conjugated polymers present various band gaps at constant correlations, and single-particle gaps can be related to the structure. The nature of the lowest singlet excited state depends sensitively on both correlations and alternation. 22 refs, 2 figs.

• Research Organization: Sandia National Labs., Albuquerque, NM (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States); National Science Foundation, Washington, DC (United States)
• DOE Contract Number: AC04-94AL85000
• OSTI ID: 10129880
• Report Number(s): SAND--93-1587C; CONF-931108--89; ON: DE94005587; BR: GB0103012; CNN: Grant DMR-9300163
• Country of Publication: United States
• Language: English

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