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Phthalocyanines have remarkable chemical and thermal stability and offer tremendous architectural flexibility in their structure, facilitating the tailoring of physical, optoelectronic, and chemical parameters. In this paper, we summarize experimental measurements of nonlinear optical absorption in a comprehensive representative series of modified phthalocyanines substituted with various central metals and peripheral functional groups. Rate equations are used to analytically solve the static‐state conditions that simulate the excited‐state dynamics that result from the nonlinear excited‐state absorption, and this solution is fitted to the experimental data. General molecular engineering trends relating the optical limiting performance of these compounds to their structural characteristics are also explored and discussed.
A tremendous degree of design flexibility is offered by phthalocyanines, with which they may be employed to fabricate practical organic passive optical limiters. In this review, the nonlinear optical absorption of a comprehensive representative series of modified phthalocyanines is experimentally determined, modeled, and discussed. Using the simple z‐scan technique, the effect of substitution with various central metals and peripheral functional groups is experimentally explored. General trends relating the optical limiting performance of these compounds to their structural characteristics are also discussed.