Stimulated Raman generation of aqueous singlet oxygen without photosensitizers

Olaizola, Aristides Marcano; Kuis, Robinson; Johnson, Anthony; Kingsley, David H.

doi:10.1016/j.jphotobiol.2022.112562

Cited by 5 publications

(12 citation statements)

References 51 publications

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“…Similar results were reported when pumping at 410 and 440 nm. 17 The first and secondary Stokes D 2 O peaks appear shifted compared with the corresponding H 2 O Stokes signals. However, the O 2 ( 1 Δ g ) "red peak" appears around the 605-nm region without significant changes.…”

Section: Results and Analysismentioning

confidence: 96%

“…Finally, we detect a broad peak in the red region (peaked 605-610 nm), which we have attributed to O 2 ( 1 Δ g ) photoexcitation. 17 Figure 3B presents the H 2 O Raman spectra when using OPO excitation at 430 nm. All Raman peaks appear red shifted, as expected for Raman signals.…”

Section: Results and Analysismentioning

confidence: 99%

“…Other solvents (methanol, glycerol, and hexane) also show the same O 2 ( 1 Δ g ) "red peak." 17 Figure 5A shows the "red peaks" corresponding to the O 2 ( 1 Δ g ) photoexcitation obtained for H 2 O and D 2 O as a function of the Stokes frequency shift. Figure 5B shows the same peak obtained in glycerol and H 2 O.…”

Section: Results and Analysismentioning

confidence: 99%

“…We have previously reported the presence of the same red Stokes components for other solvents (glycerol, methanol, and hexane). 17 Furthermore, the O 2 ( 1 Δ g ) Stokes signal is amplitude dependent on the amount of oxygen dissolved in the solvent. The spectral width of the O 2 ( 1 Δ g ) Stokes signal is larger than the Stokes signal from the solvent molecules' stretching modes due to the electronic character of the transition as compared with the vibrational origin of the Raman transition for the solvent molecules.…”

Section: Theoretical Considerationsmentioning

confidence: 99%

“…We have recently proposed O 2 ( 1 Δ g ) photoexcitation based on the Raman effect. 17 Nanosecond excitation light in the blue region (405-480 nm) induces a Raman transition from the ground to the O 2 ( 1 Δ g ) state of the oxygen molecule dissolved in water, generating Stokes light in the red region (600-670 nm) of the spectrum. This result agrees with the Quantum Mechanics rule of mutual exclusion: Raman modes of centrosymmetric molecules are active when the corresponding infrared modes are inactive.…”

Section: Introductionmentioning

confidence: 99%

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Confirming the stimulated Raman origin of singlet‐oxygen photogeneration

Olaizola,

Zerrad,

Janneto

et al. 2023

J Raman Spectroscopy

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We confirm the Raman origin of the singlet oxygen photogenerated in water environments without using photosensitizers. Nanosecond light pulses in the blue region of the spectra (405–480 nm) generate Raman Stokes excitation of singlet oxygen in the red region (600–670 nm) when focusing on pure distilled water. The excitation also produces Stokes components corresponding to the stretching modes of water molecules. The time evolution of both types of Stokes components, singlet oxygen, and stretching modes correspond to the time duration of the excitation pulse as expected for a Raman process. Their power dependences are also similar. Finally, both signals exhibit high refractive ring structures due to the nonlinear optical interaction generated by the stimulated Raman process.

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Section: Results and Analysismentioning

confidence: 96%

Section: Results and Analysismentioning

confidence: 99%

Section: Results and Analysismentioning

confidence: 99%

Section: Theoretical Considerationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Confirming the stimulated Raman origin of singlet‐oxygen photogeneration

Olaizola,

Zerrad,

Janneto

et al. 2023

J Raman Spectroscopy

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Alder‐Ene Reaction‐Mediated Suppression of Tin(II) Oxidation for Efficient Tin‐Lead Perovskite Solar Cells

Yan,

Zhu,

Xin

et al. 2024

Angewandte Chemie

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Despite numerous studies have reported the inhibition of tin (II) oxidation in mixed tin‐lead halide perovskite, there remains a dearth of mechanistic information regarding how tin (II) undergoes oxidation in the precursor solution, particularly in terms of the involvement of DMSO. We here take advantage of density functional theory (DFT) to uncover that SnI2 can coordinate with DMSO and react with singlet oxygen, resulting in the generation of Sn (IV). Moreover, our DFT simulations reveal that benzaldehyde oxime (BZHO) competes with SnI2 in reacting with oxygen through the Alder‐ene reaction, hence effectively restraining the oxidation of tin (II), which is further verified by several experimental characterizations. Besides, the introduction of BZHO has also regulated the crystallization of the perovskite film and modified the electronic structure of the perovskite surface. As a result, the perovskite solar cells with the addition of BZHO demonstrate superior performance and operational stability, retaining 82% of the initial PCE under continuous 1‐sun illumination for 800 hours. Furthermore, the efficiency of all‐perovskite tandem solar cells treated with BZHO reached 26.76%. Therefore, this work presents a promising strategy for designing high‐performance and stable all‐perovskite tandem solar cells.

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