Two-photon absorption cross-section and triplet states of dendritic Pt-acetylides for OPL applications
2005 (English)In: Proceedings of SPIE - The International Society for Optical Engineering, SPIE - The International Society for Optical Engineering , 2005Conference paper (Refereed)
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.
Place, publisher, year, edition, pages
SPIE - The International Society for Optical Engineering , 2005.
, Proceedings of SPIE - The International Society for Optical Engineering, 5934
Optical power limiting; Platinum alkynyl complexes; Time-resolved luminescence; Triplet state; Twophoton absorption induced luminescence; Z-scan
IdentifiersURN: urn:nbn:se:kth:diva-25496DOI: 10.1117/12.624449ScopusID: 2-s2.0-31744437711OAI: oai:DiVA.org:kth-25496DiVA: diva2:358776
Nonlinear Optical Transmission and Multiphoton Processes in Organics III; San Diego, CA; 2 August 2005 through 2 August 2005
QC 201010252010-10-252010-10-25Bibliographically approved