In the present work, the excited states (singlet and triplet) for three different porphyrins, with and without coordinated Pt(II) complex derivatives, were investigated by three different temporal laser regimes were employed in the Z-Scan technique. Intersystem crossing time (singlet to triplet conversion mechanism) was obtained by a combination of Z-Scan with single or with a train of picosecond laser pulses. These measurements have shown that the excited state absorption spectrum shows distinct absorption behaviors. Also, the absorption cross-section is equivalent to the ground state, describing no changes in the optical transmittance.

Fluorescence lifetimes and quantum yields were determined, respectively, by time resolved fluorescence analysis. To determine the intersystem crossing time constant, two additional levels were incorporated to the rate equation model. Moreover, fluorescence decays, internal conversion and ISC times have shown a strong dependence in Pt(II) derivatives and their position to the porphyrin ring (meta or para position).

在目前的工作中，在Z-Scan技术中，通过三种不同的时间激光方案研究了三种带有和不带有配位Pt（II）复杂衍生物的卟啉的激发态（单重态和三重态）。通过Z-Scan与单个或一系列皮秒激光脉冲的组合，可以获得系统间的穿越时间（单态到三态转换机制）。这些测量表明，激发态吸收光谱显示出不同的吸收行为。另外，吸收截面与基态相同，因此光透射率没有变化。

荧光寿命和量子产率分别通过时间分辨荧光分析确定。为了确定系统间穿越时间常数，将两个附加级别合并到速率方程模型中。此外，荧光衰减，内部转换和ISC时间显示出对Pt（II）衍生物及其在卟啉环上的位置（间位或对位）的强烈依赖性。