Two-photon absorption cross-section and triplet states of dendritic Pt-acetylides for OPL applications

Eirik Glimsdal; Anders Eriksson; Robert Vestberg; Eva Malmstrom; Mikael Lindgren

doi:10.1117/12.624449

18 August 2005 Two-photon absorption cross-section and triplet states of dendritic Pt-acetylides for OPL applications

Eirik Glimsdal, Anders Eriksson, Robert Vestberg, Eva Malmstrom, Mikael Lindgren

Proceedings Volume 5934, Nonlinear Optical Transmission and Multiphoton Processes in Organics III; 59340N (2005) https://doi.org/10.1117/12.624449
Event: Optics and Photonics 2005, 2005, San Diego, California, United States

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.

Citation Download Citation

Eirik Glimsdal, Anders Eriksson, Robert Vestberg, Eva Malmstrom, and Mikael Lindgren "Two-photon absorption cross-section and triplet states of dendritic Pt-acetylides for OPL applications", Proc. SPIE 5934, Nonlinear Optical Transmission and Multiphoton Processes in Organics III, 59340N (18 August 2005); https://doi.org/10.1117/12.624449

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