Effect of peripheral substitution on the optical limiting properties of zinc phthalocyanines

How Ghee Ang; Bai Wang Sun; Guo Ying Yang; May Ka Yuen Lee; Yiew Wang Lee

doi:10.1117/12.452090

18 December 2002 Effect of peripheral substitution on the optical limiting properties of zinc phthalocyanines

How Ghee Ang, Bai Wang Sun, Guo Ying Yang, May Ka Yuen Lee, Yiew Wang Lee

Proceedings Volume 4798, Linear and Nonlinear Optics of Organic Materials II; (2002) https://doi.org/10.1117/12.452090
Event: International Symposium on Optical Science and Technology, 2002, Seattle, WA, United States

Abstract

Six zinc phthalocyanines with peripheral propanethio or p-methylbenzenethio groups, namely 1,8,15,22-tetrapropanethiophthalocyaninatozinc(II) (1), 1,8,15,22-tetra(p-methylbenzenethio)phthalocyaninatozinc(II) (2), 2,9,16,23-tetrapropanethiophthalocyaninatozinc(II) (3), 2,9,16,23-tetra(p-methylbenzenethio)phthalocyaninatozinc(II) (4), 2,3,9,10,16,17,23,24-octapropanethio phthalocyaninatozinc(II) (5), 2,3,9,10,16,17,23,24-octa(p-methylbenzenethio) phthalocyaninatozinc(II) (6) were synthesized for optical limiting study at 532 nm (pulse duration: 5 ns, repetition rate: 20 Hz). All of the compounds exhibited good optical limiting property when measured in dichloromethane solution in a quartz cell (pathlength: 1 mm, linear transmission: 75 %). The limiting thresholds (Fth, T/T₀ = 0.5) of these metal phthalocyanines were found to be 0.91, 1.1, 0.38, 0.5, 0.18, 0.15 J cm^-2from complexes 1 to 6, respectively. The difference in their optical limiting performance can be attributed to their different ratio between excited state and ground state absorption cross section (σ_ex/σ_g), as demonstrated by Z scan measurements. C₆₀ and (t-Bu)₄PcInCl, benchmark optical limiting materials at 532 nm, were measured under the same conditions for comparison.

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How Ghee Ang, Bai Wang Sun, Guo Ying Yang, May Ka Yuen Lee, and Yiew Wang Lee "Effect of peripheral substitution on the optical limiting properties of zinc phthalocyanines", Proc. SPIE 4798, Linear and Nonlinear Optics of Organic Materials II, (18 December 2002); https://doi.org/10.1117/12.452090

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