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Proceedings Paper

Effect of peripheral substitution on the optical limiting properties of zinc phthalocyanines
Author(s): How Ghee Ang; Bai Wang Sun; Guo Ying Yang; May Ka Yuen Lee; Yiew Wang Lee
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Paper 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-2 from 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 (σexg), 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.

Paper Details

Date Published: 18 December 2002
PDF: 7 pages
Proc. SPIE 4798, Linear and Nonlinear Optics of Organic Materials II, (18 December 2002); doi: 10.1117/12.452090
Show Author Affiliations
How Ghee Ang, National Univ. of Singapore (Singapore)
Bai Wang Sun, National Univ. of Singapore (Singapore)
Guo Ying Yang, DSO National Labs. (Singapore)
May Ka Yuen Lee, DSO National Labs. (Singapore)
Yiew Wang Lee, DSO National Labs. (Singapore)

Published in SPIE Proceedings Vol. 4798:
Linear and Nonlinear Optics of Organic Materials II
Manfred Eich; Mark G. Kuzyk, Editor(s)

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