Synthesis and Optical Limiting Characterization of a Porphyrin-Buckminsterfullerene Dyad

1999 ◽  
Vol 561 ◽  
Author(s):  
Kenneth J. McEwan ◽  
Keith L. Lewis ◽  
How-Ghee Ang ◽  
Zhi-Heng Loh ◽  
Leng-Leng Chng ◽  
...  
Keyword(s):  
Excited State ◽  
Cross Section ◽  
Excited State Absorption ◽  
Optical Limiting ◽  
Azomethine Ylide ◽  
Absorption Cross ◽  
Model Compounds ◽  
Close Proximity ◽  
532 Nm

ABSTRACTThe optical limiting performances of donor-buckminsterfullerene (C60) dyads have hitherto been unreported. The predicted large excited state absorption cross-section of such dyads in their charge-separated states would enable them to exhibit enhanced optical limiting relative to their individual components. We report herein the synthesis and optical limiting characterization of a novel porphyrin-buckminsterfullerene dyad, in which the porphyrin and C60 moieties are held within close proximity of one another by an o-phenylene bridge. The porphyrin-C60 dyad was synthesized via 1,3-dipolar azomethine ylide cycloaddition, and was obtained in 37.0% yield. Optical limiting measurements at 532 nm using 3-ns pulses show that the limiting performance of the dyad is poorer compared to its model compounds. Possible reasons for the worsened performance of the dyad will be discussed.

Photophysical and optical limiting properties at 532 nm of BODIPY dyes with p-benzyloxystyryl groups at the 3,5-positions

2018 ◽  
Vol 22 (05) ◽  
pp. 413-422 ◽  
Author(s):  
Bokolombe P. Ngoy ◽  
Zweli Hlatshwayo ◽  
Njemuwa Nwaji ◽  
Gertrude Fomo ◽  
John Mack ◽  
...  
Keyword(s):  
Optical Properties ◽  
Excited State ◽  
Nonlinear Optical ◽  
Heavy Atom ◽  
Excited State Absorption ◽  
Optical Limiting ◽  
Synthesis And Characterization ◽  
532 Nm ◽  
Atom Effect

The synthesis and characterization of a series of 3,5-di-[Formula: see text]-benzyloxystyrylBODIPY dyes with different substituents at the meso-aryl position is reported. The photophysical and nonlinear optical properties are described. BODIPYs of this type are found to be suitable for optical limiting at 532 nm on the nanosecond timescale. An enhancement of the population of the T[Formula: see text] state through the incorporation of bromine atoms at the 2,6-positions does not result in an enhancement of the optical limiting properties on a nanosecond timescale. This suggests that, in contrast with phthalocyanines, access to excited state absorption (ESA) from the T[Formula: see text] state through the introduction of a heavy atom effect does not provide a significantly improved reverse saturable absorbance response compared to ESA from the S[Formula: see text] state.

Measurement of the Excited-State Molecular Polarizability of C60

1994 ◽  
Vol 359 ◽  
Author(s):  
N. Tang ◽  
R. W. Hellwarth ◽  
J. P. Partanen
Keyword(s):  
Excited State ◽  
Cross Section ◽  
Benzene Solution ◽  
Excited State Absorption ◽  
Molecular Polarizability ◽  
Wave Mixing ◽  
Pump Probe ◽  
Probe Experiment ◽  
Pump Probe Experiment ◽  
532 Nm

ABSTRACTWe use ∼30 ps pulses at 532 nm to measure the complex excited-state molecular polarizability αe in a C60/benzene solution. We determine the imaginary part of αe by measuring the excited-state absorption cross-section in a pump-probe experiment. In a degenerate-four-wave-mixing (DFWM) experiment, we find that in delayed probing of the complex index gratings formed by ∼30 ps pulses, the thermal and the excited-state polarizability changes both contribute to these transient gratings.

Optical limiting properties of water-soluble phthalocyanine derivatives

2003 ◽  
Vol 07 (06) ◽  
pp. 447-451 ◽  
Author(s):  
Shuang Zhang ◽  
Zhou Yang ◽  
Hongwei Liu ◽  
Fu Xi ◽  
Zhi-xin Guo ◽  
...  
Keyword(s):  
Cross Section ◽  
Excited State Absorption ◽  
Optical Limiting ◽  
Water Soluble ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
Solubility In Water ◽  
Practical Applications ◽  
Good Solubility ◽  
532 Nm

The optical-limiting properties of several water-soluble phthalocyanine derivatives in aqueous solution were measured at 532 nm with 10 ns pulses. The excited state absorption cross-section σex of the derivatives were determined with the Z-scan technique. The results showed that the phthalocyanine derivatives are materials for reverse saturable absorption. It was noted that the optical limiting performance of the phthalocyanine derivatives in aqueous solutions can be controlled through the addition of alkalis. These phthalocyanine derivatives possess good solubility in water and optical limiting controllability, which give rise to their use for practical applications.

Syntheses and Optical Limiting Characterizations of a Series of Porphyrin-Buckminsterfullerene Dyads

1999 ◽  
Vol 597 ◽  
Author(s):  
How-Ghee Ang ◽  
Zhi-Heng Loh ◽  
Leng-Leng Chng ◽  
Yiew-Wang Lee ◽  
Guo-Ying Yang ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Optical Limiting ◽  
Triplet States ◽  
Free Base ◽  
Excited Singlet ◽  
Model Compounds ◽  
Close Proximity ◽  
Singlet And Triplet States ◽  
532 Nm ◽  
Porphyrin Moiety

AbstractWe report herein the syntheses and optical limiting characterizations of a series of porphyrin-C60 dyads in which the porphyrin and C60 moieties are held within close proximity of one another by an o-phenylene bridge. The electron-donating ability of the porphyrin moiety in the dyads is systematically varied through chemical modification. This allows us to control the ease of electron transfer from the porphyrin to the C60 moiety in these dyads. Optical limiting measurements at 532 nm using 3-ns pulses show that the limiting performances of the dyads are poorer relative to their model compounds. This could be due to an ultra-short lifetime for the charge-separated species or a depopulation of the triplet states by photoinduced electron transfer. The optical limiting performances of the free-base porphyrin-C60 dyads are also related to the electron- donating abilities of the meso substituents of the porphyrin moieties. 12PorphyC60 displays better limiting performance at 532 nm (with 3-ns and 15-ns pulses) compared to Val12PorphyC60. This trend has been rationalized in terms of the relative energies of the first excited singlet and triplet states of the fullerene moiety and the charge-separated state of the dyads.

A STUDY OF PHOTOACOUSTIC EFFECTS AND OPTICAL LIMITING IN THE SOLUTION OF C60 IN TOLUENE

1996 ◽  
Vol 10 (01n02) ◽  
pp. 61-67 ◽  
Author(s):  
RIJU C. ISSAC ◽  
C.V. BINDHU ◽  
S.S. HARILAL ◽  
GEETHA K. VARIER ◽  
V.P.N. NAMPOORI ◽  
...  
Keyword(s):  
Excited State ◽  
Nd:Yag Laser ◽  
Excited State Absorption ◽  
Optical Limiting ◽  
Nonlinear Scattering ◽  
Dominant Process ◽  
532 Nm

Pulsed photoacoustic studies in solution of C 60 in toluene have been made using the 532 nm radiation from a frequency doubled Nd:YAG laser. Though C 60 is found to exhibit the phenomenon of optical limiting, the results on photoacoustic measurements do not give any indication of multiphoton transitions as suggested in some of the earlier works. Results of photoacoustic measurements show that excited state absorption is the dominant process responsible for optical limiting while phenomena like nonlinear scattering may contribute to a lesser extent.

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