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Proceedings Paper

Photophysical and lasing characterization of some phenylenevinylene-based polymers
Author(s): Alfons Penzkofer; Wolfgang Holzer; Hartwig Tillmann; Regina Stockmann; Hans-Heinrich Hoerhold
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Paper Abstract

Traveling-wave lasing is reported on two phenylenevinylene polymers (MEH-PPV, M3EH-PPV), two triphenylamine-vinylene- phenylenevinylene copolymers (TPA-MOP-PPV, TPA-MEH-PPV), and a ternaric condensation copolymer containing TPA-MEH-PV and M3EH-PV sub-units (TPA-MEH-M3EH-PPV). Waveguiding thin films on glass substrates are transversally pumped with picosecond lasers pulses (wavelength 347.15 nm, duration 35 ps). The laser emission occurs between 515 nm (TPA-MOP-PPV) and 646 nm (M3EH-PPV) with a spectral width between 7 nm and 13 nm. The threshold pump pulse energy densities are between 10 (mu) J cm-2 and 45 (mu) J cm-2. At high pump pulse energies a saturation of the generated amplified spontaneous emission signal is observed which is thought to be due to exciton-exciton annihilation processes. Additionally a diphenyl substituted phenylenevinylene polymer (DPOP-PPV) is investigated which shows no laser action despite high neat-film fluorescence quantum efficiency ((phi) F equals 0.72). Photo-induced absorption dominates over stimulated emission and hinders traveling- wave lasing. An absorption and emission spectroscopic characterization of the investigated polymers is carried out. An energy density dependent fluorescence quenching is observed and this behavior is discussed in terms of exciton- exciton annihilation processes.

Paper Details

Date Published: 26 March 2002
PDF: 12 pages
Proc. SPIE 4747, International Conference on Atomic and Molecular Pulsed Lasers IV, (26 March 2002); doi: 10.1117/12.460123
Show Author Affiliations
Alfons Penzkofer, Univ. Regensburg (Germany)
Wolfgang Holzer, Univ. Regensburg (Germany)
Hartwig Tillmann, INNOVENT Technologieentwicklung e.V. and Friedrich-Schiller-Univ. Jena (Germany)
Regina Stockmann, INNOVENT Technologieentwicklung e.V. and Friedrich-Schiller-Univ. Jena (Germany)
Hans-Heinrich Hoerhold, INNOVENT Technologieentwicklung e.V. and Friedrich-Schiller-Univ. Jena (Germany)


Published in SPIE Proceedings Vol. 4747:
International Conference on Atomic and Molecular Pulsed Lasers IV

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