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Proceedings Paper

Two-photon absorption cross-section and triplet states of dendritic Pt-acetylides for OPL applications
Author(s): Eirik Glimsdal; Anders Eriksson; Robert Vestberg; Eva Malmstrom; Mikael Lindgren
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Paper Abstract

The photo-physical properties of bis((4-(phenylethynyl)phenyl)ethynyl)bis(tributylphosphine) platinum(II) with 2,2-bis(methylol)propionic acid (bis-MPA) dendritic substituents were studied. The introduction of dendrimer capping was found to give rise to protection from oxygen quenching of phosphorescent states with a considerably longer decay time of the phosphorescence (0.1 -0.4 ms range) for solvents with oxygen removed or dendrimers of larger size (G2-G4) or higher concentration. Presence of oxygen reduces the phosphorescence decay time to below 1 microsecond. Two-photon induced fluorescence and z-scan of fs pulses at low pulse repetition frequency at approximately 720 nm revealed that the two-photon absorption cross-section is in the order of 0.01 cm/GW, well below the 0.34cm/GW reported by Staromlynska et al [J. Staromlynska, T. McKay and P. Wilson, J. Appl. Phys. 88, 1726 (2000)] and similar for all dendrimer complexes as well as the non-capped Pt-acetylide. Z-scans performed at high pulse repetition frequency gives an apparent two-photon absorption cross-section that is higher due to the population of excited triplet states, and the contribution from incoherent multiphoton absorption involving the triplet states.

Paper Details

Date Published: 18 August 2005
PDF: 10 pages
Proc. SPIE 5934, Nonlinear Optical Transmission and Multiphoton Processes in Organics III, 59340N (18 August 2005); doi: 10.1117/12.624449
Show Author Affiliations
Eirik Glimsdal, Norwegian Univ. of Science and Technology (Norway)
Anders Eriksson, Swedish Defence Research Agency (Sweden)
Robert Vestberg, Royal Institute of Technology (Sweden)
Eva Malmstrom, Royal Institute of Technology (Sweden)
Mikael Lindgren, Norwegian Univ. of Science and Technology (Norway)

Published in SPIE Proceedings Vol. 5934:
Nonlinear Optical Transmission and Multiphoton Processes in Organics III
A. Todd Yeates, Editor(s)

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