Abstract
The project intends to extend phthalocyanine’s applications to non-linear optical areas as optical limiting materials（OL）. The latter meets the need of eye and/or instrument protection for laser practice. When the intensity of incident laser beam exceeding certain limit of safety standard, OL keeps a constant level of input energy in order to avoid damage. In this project, we shall study the OL mechanism via a five-energy-state diagram by UV and fluorescence spectrometry. Phthalocyanine derivatives, especially those absorption peaks beyond 800nm exceeding the visible range（400-800nm）, shall be synthesized. Its performance shall be evaluated through Z-scan by laser.