Time- and spectrally resolved singlet oxygen phosphorescence detection—discriminating disturbance signals

Pfitzner, Sebastian; Schlothauer, Jan C.; Röder, Beate; Hackbarth, Steffen

doi:10.1088/1555-6611/aac5cc

Cited by 6 publications

(3 citation statements)

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“…Spectral resolution was realized using a tiltable interference filter. Technical details and proof of concept are about to be published separately . Data were collected for 10 s at each filter angle (0°–40° in steps of 1°).…”

Section: Methodsmentioning

confidence: 99%

“…Technical details and proof of concept are about to be published separately. 11 Data were collected for 10 s at each filter angle (0°−40°in steps of 1°). Tilting the filter from 0°to 40°, the central wavelength of the detection window is shifted from 1325 to 1190 nm, where an angle of 23°results in a central transmission wavelength of 1270 nm.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

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Singlet Oxygen Kinetics in Polymeric Photosensitizers

et al. 2018

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Nanoparticles built up from polythiophenes act as photosensitizers without embedding any additional chromophores. The self-organized water-soluble nanoparticles in this work are made from polythiophene precursors with alkyl side chains which were combined with diphosphatidylcholine-polyethylene glycol in different mass ratios. The fluorescence and singlet oxygen quantum yields of such nanoparticles can be tuned by varying the mass ratio of the two components. Two unique properties of these polymeric photosensitizers result in special singlet oxygen kinetics. First, the backbone orientation of the polythiophene influences the probability of triplet excitons, which have a high mobility across all the nanoparticle and, second, oxygen can diffuse in and out of the polymeric photosensitizer. Therefore, most of the singlet oxygen is generated inside the nanoparticle, close to the surface, soon after oxygen diffuses in. After generation, the majority of the singlet oxygen diffuses out of the nanoparticle. Using highly sensitive time- and spectrally resolved singlet oxygen phosphorescence detection, the oxygen diffusion can be confirmed, and the observed kinetics and quantum yield variations can be explained based on the polymer–semiconductor model. Whenever singlet oxygen kinetics in polymeric nanostructures are investigated, such oxygen diffusion effects have to be taken into account.

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Section: Methodsmentioning

confidence: 99%

Section: ■ Materials and Methodsmentioning

confidence: 99%

Singlet Oxygen Kinetics in Polymeric Photosensitizers

et al. 2018

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“…Spectral discrimination can also be achieved by altering the tilt angle of an interference filter. 1019 Alternatively, when using a sufficiently fast near-IR detector under conditions in which the inherent O 2 (a 1 Δ g ) formation and decay kinetics are comparatively slow, the effects of the interfering spike can be accommodated in the fitting routine. 1020 Although sensitizer fluorescence and phosphorescence generally occur in the visible region of the spectrum, and either excite luminescence from optics or are transmitted through poor filters, sensitizer phosphorescence can also occur at 1275 nm.…”

Section: Detection Based On Radiative Transitionsmentioning

confidence: 99%

Singlet Oxygen Photophysics: From Liquid Solvents to Mammalian Cells

Bregnhøj,

Thorning,

Ogilby

2024

Chem. Rev.

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Molecular oxygen, O2, has long provided a cornerstone for studies in chemistry, physics, and biology. Although the triplet ground state, O2(X3Σg –), has garnered much attention, the lowest excited electronic state, O2(a1Δg), commonly called singlet oxygen, has attracted appreciable interest, principally because of its unique chemical reactivity in systems ranging from the Earth’s atmosphere to biological cells. Because O2(a1Δg) can be produced and deactivated in processes that involve light, the photophysics of O2(a1Δg) are equally important. Moreover, pathways for O2(a1Δg) deactivation that regenerate O2(X3Σg –), which address fundamental principles unto themselves, kinetically compete with the chemical reactions of O2(a1Δg) and, thus, have practical significance. Due to technological advances (e.g., lasers, optical detectors, microscopes), data acquired in the past ∼20 years have increased our understanding of O2(a1Δg) photophysics appreciably and facilitated both spatial and temporal control over the behavior of O2(a1Δg). One goal of this Review is to summarize recent developments that have broad ramifications, focusing on systems in which oxygen forms a contact complex with an organic molecule M (e.g., a liquid solvent). An important concept is the role played by the M+•O2 –• charge-transfer state in both the formation and deactivation of O2(a1Δg).

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