Oxygen effects on tetrapropylporphycene near-infrared luminescence kinetics

Marek Scholz; Roman Dědic; Jan Hála; Santi Nonell

doi:10.1016/j.molstruc.2012.12.029

Oxygen effects on tetrapropylporphycene near-infrared luminescence kinetics

Marek Scholz, Roman Dědic, Jan Hála, Santi Nonell

IQS School of Engineering

Research output: Indexed journal article › Article › peer-review

8 Citations (Scopus)

Abstract

Tetra-propyl-porphycene (TPrPo) in solution has been studied by means of time-and spectral-resolved near-infrared (NIR) luminescence spectroscopy. The NIR luminescence kinetics exhibits surprising dependence on oxygen concentration. There is a clearly visible long-lived (microsecond range) rise-section in biexponential kinetics at broad NIR spectral range of 800-1100 nm for lowered oxygen concentrations. The rise-section is not present in nitrogen-saturated samples and it also disappears after addition of singlet oxygen (¹O₂) physical quencher DABCO, which means that the effect is ¹O₂-mediated. Kinetics of TPrPo delayed fluorescence detected around 650 nm possess a similar rise-decay character in microsecond range. Simultaneous measurements of ¹O₂ phosphorescence kinetics, triplet-triplet transient absorption, and delayed fluorescence have provided additional information about the phenomenon. It is proposed that TPrPo shows a singlet oxygen-sensitized delayed fluorescence which extends to near-infrared where it is strong enough to override the phosphorescence emission.

Original language	English
Pages (from-to)	303-307
Number of pages	5
Journal	Journal of Molecular Structure
Volume	1044
DOIs	https://doi.org/10.1016/j.molstruc.2012.12.029
Publication status	Published - 24 Jul 2013

Keywords

Delayed fluorescence
Phosphorescence
Porphycene
Porphyrin
Rise-decay kinetics
Singlet oxygen

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10.1016/j.molstruc.2012.12.029

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title = "Oxygen effects on tetrapropylporphycene near-infrared luminescence kinetics",

abstract = "Tetra-propyl-porphycene (TPrPo) in solution has been studied by means of time-and spectral-resolved near-infrared (NIR) luminescence spectroscopy. The NIR luminescence kinetics exhibits surprising dependence on oxygen concentration. There is a clearly visible long-lived (microsecond range) rise-section in biexponential kinetics at broad NIR spectral range of 800-1100 nm for lowered oxygen concentrations. The rise-section is not present in nitrogen-saturated samples and it also disappears after addition of singlet oxygen (1O2) physical quencher DABCO, which means that the effect is 1O2-mediated. Kinetics of TPrPo delayed fluorescence detected around 650 nm possess a similar rise-decay character in microsecond range. Simultaneous measurements of 1O2 phosphorescence kinetics, triplet-triplet transient absorption, and delayed fluorescence have provided additional information about the phenomenon. It is proposed that TPrPo shows a singlet oxygen-sensitized delayed fluorescence which extends to near-infrared where it is strong enough to override the phosphorescence emission.",

keywords = "Delayed fluorescence, Phosphorescence, Porphycene, Porphyrin, Rise-decay kinetics, Singlet oxygen",

author = "Marek Scholz and Roman D{\v e}dic and Jan H{\'a}la and Santi Nonell",

note = "Funding Information: The presented work was supported by the project P202/09/H041 from the Grant Agency of the Czech Republic, the Grant SVV-265304 from Charles University , and by Grant CTQ2010-20870-C03-01 from the Spanish Ministry of Economy and Competitiveness .",

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doi = "10.1016/j.molstruc.2012.12.029",

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AU - Scholz, Marek

AU - Dědic, Roman

AU - Hála, Jan

AU - Nonell, Santi

N1 - Funding Information: The presented work was supported by the project P202/09/H041 from the Grant Agency of the Czech Republic, the Grant SVV-265304 from Charles University , and by Grant CTQ2010-20870-C03-01 from the Spanish Ministry of Economy and Competitiveness .

PY - 2013/7/24

Y1 - 2013/7/24

N2 - Tetra-propyl-porphycene (TPrPo) in solution has been studied by means of time-and spectral-resolved near-infrared (NIR) luminescence spectroscopy. The NIR luminescence kinetics exhibits surprising dependence on oxygen concentration. There is a clearly visible long-lived (microsecond range) rise-section in biexponential kinetics at broad NIR spectral range of 800-1100 nm for lowered oxygen concentrations. The rise-section is not present in nitrogen-saturated samples and it also disappears after addition of singlet oxygen (1O2) physical quencher DABCO, which means that the effect is 1O2-mediated. Kinetics of TPrPo delayed fluorescence detected around 650 nm possess a similar rise-decay character in microsecond range. Simultaneous measurements of 1O2 phosphorescence kinetics, triplet-triplet transient absorption, and delayed fluorescence have provided additional information about the phenomenon. It is proposed that TPrPo shows a singlet oxygen-sensitized delayed fluorescence which extends to near-infrared where it is strong enough to override the phosphorescence emission.

AB - Tetra-propyl-porphycene (TPrPo) in solution has been studied by means of time-and spectral-resolved near-infrared (NIR) luminescence spectroscopy. The NIR luminescence kinetics exhibits surprising dependence on oxygen concentration. There is a clearly visible long-lived (microsecond range) rise-section in biexponential kinetics at broad NIR spectral range of 800-1100 nm for lowered oxygen concentrations. The rise-section is not present in nitrogen-saturated samples and it also disappears after addition of singlet oxygen (1O2) physical quencher DABCO, which means that the effect is 1O2-mediated. Kinetics of TPrPo delayed fluorescence detected around 650 nm possess a similar rise-decay character in microsecond range. Simultaneous measurements of 1O2 phosphorescence kinetics, triplet-triplet transient absorption, and delayed fluorescence have provided additional information about the phenomenon. It is proposed that TPrPo shows a singlet oxygen-sensitized delayed fluorescence which extends to near-infrared where it is strong enough to override the phosphorescence emission.

KW - Delayed fluorescence

KW - Phosphorescence

KW - Porphycene

KW - Porphyrin

KW - Rise-decay kinetics

KW - Singlet oxygen

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VL - 1044

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JO - Journal of Molecular Structure

JF - Journal of Molecular Structure

ER -

Oxygen effects on tetrapropylporphycene near-infrared luminescence kinetics

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Keywords

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