Optical limiting response in a unsymmetrical dithiolene metal complex (Me4N)2[Zn(dmit)(Sph)2]

We report the measurements of reverse saturable absorption (RSA) and optical limiting responses in a unsymmetric dithiolene metal complex (Me4N)2[Zn(dmit)(Sph)2] with nanosecond and picosecond laser pulses at 532 nm. The experimental results show that the triplet–triplet absorption is responsible for the measured RSA, resulting in optical limiting responses. The measured data can be well simulated by a rate equation model to obtain the absorption cross-section of the excited state.