Effect of heteroatom‐doped carbon quantum dots on the red emission of metal‐conjugated phthalocyanines through hybridization

Luminescence - Tập 37 Số 2 - Trang 268-277 - 2022
Şule Eryiğit1, Ali Gelir2, Esranur Budak3, Caner Ünlü3,1,4, Azize Gömleksiz2, İbrahim Özçeşmeci1, Ahmet Gül1
1Faculty of Science and Letters, Department of Chemistry, Istanbul Technical University, Maslak, Istanbul, Turkey
2Faculty of Science and Letters, Department of Engineering Physics, Istanbul Technical University, Maslak, Istanbul, Turkey
3Department of Nanoscience and Nanoengineering, Istanbul Technical University, Maslak, Istanbul, Turkey
4Istanbul Technical University Nanotechnology Research and Application Center (ITUNano), Istanbul, Turkey

Tóm tắt

AbstractQuantum dots (QDs) are significant fluorescent materials for energy transfer studies with phthalocyanines (Pcs) and phthalocyanine (Pc)‐like biomolecules (such as chlorophylls). Carbon‐based QDs, especially, have been used in numerous studies concerning energy transfer with chlorophylls, but the numbers of studies concerning energy transfer between phthalocyanines and carbon‐based QDs are limited. In this study, peripherally, hydroxythioethyl terminal group substituted metal‐free phthalocyanine (H2Pc) and zinc phthalocyanine (ZnPc) were noncovalently (electrostatic and/or π–π interaction) attached to carbon QDs containing boron and nitrogen to form QD‐Pc nanoconjugates. The QD‐Pc conjugates were characterized using different spectroscopic techniques (Fourier transform infrared spectroscopy and transmission electron microscopy). The absorption and fluorescence properties of QD‐Pc structures in solution were studied. It was found that the quantum yields of the QDs slightly decreased from 30% to 25% upon doping the QDs with heteroatoms B and N. Förster resonance energy transfer efficiency was calculated as 33% for BCN‐QD/ZnPc. For the other conjugates, almost no energy transfer from QDs to Pc cores was observed. It was shown that the energy transfer between QDs to Pc cores was completely different from the energy transfer between QDs and photosynthetic pigments, and therefore we concluded that heteroatom doping in the QD structure and the existence of zinc metal in the phthalocyanine structure is obligatory for an efficient energy transfer.

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Luminescence

Tập 37 Số 2

268-277

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