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Tetrabrominated Lead Naphthalocyanine for Optical Power Limiting
Author(s) -
Dini Danilo,
Meneghetti Moreno,
Calvete Mario J. F.,
Arndt Thomas,
Liddiard Colin,
Hanack Michael
Publication year - 2010
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200901499
Subject(s) - quantum yield , excited state , absorption (acoustics) , materials science , limiting , triplet state , photochemistry , chemistry , analytical chemistry (journal) , optics , atomic physics , fluorescence , physics , organic chemistry , mechanical engineering , composite material , engineering
The complex 2,(3)‐tetrabromo‐3,(2)‐tetra[(3,5‐di‐ tert ‐butyl)phenyloxy]‐naphthalocyaninato lead [Br 4 ( t Bu 2 C 6 H 3 O) 4 NcPb, 1 ] has been prepared and its optical limiting properties for ns light pulses have been measured. Complex 1 behaves as a reverse saturable absorber within the spectral range 440–720 nm with a limiting threshold of 0.1 J cm −2 at 532 nm. The lifetime of the absorbing triplet excited state has been evaluated as 3.8×10 −7 s and the quantum yield of triplet formation has been measured as 0.07 in toluene. The nonlinear optical transmission properties of complex 1 have also been determined in Plexiglas [naphthalocyanine content: 5.0×10 −4 M (0.1 % by weight)]. A reversible nonlinear absorption was again observed for a fluence above 0.4 J cm −2 , but through different excited‐state dynamics. This may be rationalized in terms of aggregation of the molecule in the polymer matrix.