Abstract
The synthesis of ball-type zinc and gallium phthalocyanines (complexes 2 and 3) and their covalent linkage to glutathione (GSH) and amine functionalized quantum dots (QDs) are reported in this work. Furthermore, their photophysical, photo-induced resonance energy transfer and optical limiting responses were investigated. We observed a decrease in the fluorescence quantum yields with a corresponding increase in the triplet quantum yields of the nanoconjugates in comparison to the phthalocyanine complexes alone. The reverse saturable absorption was found to be dependent on the excited state absorption, and the observed limiting threshold ranged from 0.32 to 1.43 J cm-2. Enhanced triplet parameters and nonlinear optical performance were found when the complexes were covalently linked to semiconductor quantum dots compared to carbon based graphene quantum dots.
| Original language | English |
|---|---|
| Pages (from-to) | 6040-6050 |
| Number of pages | 11 |
| Journal | New Journal of Chemistry |
| Volume | 42 |
| Issue number | 8 |
| DOIs | |
| Publication status | Published - 19 Feb 2018 |
Bibliographical note
Funding Information:The authors acknowledge Technology (DST) and National Research Foundation (NRF) of South Africa through DST/NRF South African Research Chairs Initiative for Professor of Medicinal Chemistry and Nanotechnology (UID 62620), and Rhodes University.
Funding Information:
The authors acknowledge Technology (DST) and National Research Foundation (NRF) of South Africa through DST/NRF South African Research Department Initiative for Professor of Medicinal Chemistry and Nanotechnology (UID 62620), and Rhodes University.
Publisher Copyright:
© 2018 The Royal Society of Chemistry and the Centre National de la Recherche Scientifique.