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Published on: October 1, 2019
Tetrabrominated lead naphthalocyanine for optical power limiting
Danilo Dini1, Moreno Meneghetti, Mario J F Calvete
1Institute of Organic Chemistry, University of Tübingen, Auf der Morgenstelle 18, 72076 Tübingen, Germany. danilo.dini@uni-tuebingen.de
Chemistry (Weinheim an Der Bergstrasse, Germany)
|November 26, 2009
Summary
This study details a novel lead naphthalocyanine complex with significant optical limiting capabilities. It functions as a reverse saturable absorber, crucial for protecting sensitive optical equipment from high-intensity laser pulses.
Area of Science:
- Materials Science
- Nonlinear Optics
- Photochemistry
Background:
- Naphthalocyanine complexes are investigated for their nonlinear optical properties.
- Optical limiting materials are essential for protecting sensors and eyes from laser damage.
- Reverse saturable absorption is a key mechanism for optical limiting.
Purpose of the Study:
- To synthesize and characterize a novel lead naphthalocyanine complex.
- To evaluate its optical limiting performance using nanosecond (ns) laser pulses.
- To understand the excited-state dynamics and aggregation effects in different media.
Main Methods:
- Synthesis of 2,(3)-tetrabromo-3,(2)-tetra[(3,5-di-tert-butyl)phenyloxy]-naphthalocyaninato lead complex.
- Measurement of nonlinear optical transmission and optical limiting threshold.
- Determination of excited-state lifetime and triplet formation quantum yield.
- Investigation of properties in both solution (toluene) and solid-state (Plexiglas).
Main Results:
- The synthesized lead naphthalocyanine complex exhibits reverse saturable absorption between 440-720 nm.
- A low optical limiting threshold of 0.1 J cm(-2) was observed at 532 nm in toluene.
- The excited triplet state has a lifetime of 3.8 x 10(-7) s with a triplet formation quantum yield of 0.07.
- Reversible nonlinear absorption was observed in Plexiglas, attributed to molecular aggregation.
Conclusions:
- The novel lead naphthalocyanine complex is a promising material for optical limiting applications.
- Its performance is dependent on the medium, with aggregation influencing nonlinear absorption in polymers.
- Further research into structure-property relationships can optimize these materials.
