The term photoluminescence by definition can be refered to as a molecule or atom which absorbs electromagnetic energy and in turn, emits light.In quantum mechanics, it is where excitation to a higher energy state occurs, which then returns to a lower energy state, together with the emission of a photon. According to Seitz (2006) found in the Credo referencing database, “Photoluminescence excitation spectra are determined by measuring emission intensity at a fixed wavelength while varying the wavelength of the incident light used to produce the electronically excited species responsible for emission. The excitation spectrum is a measure of the efficiency of electronic excitation as a function of excitation wavelength. Photoluminescence emission
…show more content…
The pi-electron’s delocalization resulted in a large conjugated system in the ligand structure that accounted for the high yield. The photoluminescence intensities and quantum yields of the metal complex changed with respect to that of the ligand upon complexation with various metals. Based on their findings indication that the fluorescence emission intensity of the ligand decreased significantly due to the complex formation with the transition metal ions. These coordination compounds make the energy transfers possible from the excited state of the ligand to the metal ions, thus causing an increase in the non-radiated transition of the ligand excited state and also causing a decrease in the fluorescence emission. However, fluorescence increased upon complex formation with metal ions which have lower d-orbital electron numbers. The emission of the ligand discussed in this experiment was dependent on the presence of a metal ion and the ligand photoluminescence in DMSO (Dimethyl sulfoxide) was dependent on the d-block metals that are effective in the named solution. However, there was an increase in intensity associated with the formation of the metal-to-ligand ratio of 1; 2, which resulted in the formation of a larger molecule. This therefore indicates the interaction between the metal and ligand due to complexation which thereby causes a reduction of photoluminescence in Co and Ni. The other is a formation of larger molecules which applies to Cu and Zn complexes. In the experiment it was concluded that the ligand exhibited an intense photoluminescence and the complexes showed great changes in maximum luminescence
The pi-electron’s delocalization resulted in a large conjugated system in the ligand structure that accounted for the high yield. The photoluminescence intensities and quantum yields of the metal complex changed with respect to that of the ligand upon complexation with various metals. Based on their findings indication that the fluorescence emission intensity of the ligand decreased significantly due to the complex formation with the transition metal ions. These coordination compounds make the energy transfers possible from the excited state of the ligand to the metal ions, thus causing an increase in the non-radiated transition of the ligand excited state and also causing a decrease in the fluorescence emission. However, fluorescence increased upon complex formation with metal ions which have lower d-orbital electron numbers. The emission of the ligand discussed in this experiment was dependent on the presence of a metal ion and the ligand photoluminescence in DMSO (Dimethyl sulfoxide) was dependent on the d-block metals that are effective in the named solution. However, there was an increase in intensity associated with the formation of the metal-to-ligand ratio of 1; 2, which resulted in the formation of a larger molecule. This therefore indicates the interaction between the metal and ligand due to complexation which thereby causes a reduction of photoluminescence in Co and Ni. The other is a formation of larger molecules which applies to Cu and Zn complexes. In the experiment it was concluded that the ligand exhibited an intense photoluminescence and the complexes showed great changes in maximum luminescence