One- and two-photon singlet oxygen generation with new fluorene-based photosensitizers

Stephen J. Andrasik; Kevin D. Belfield; Mykhailo V. Bondar; Florencio E. Hernandez; Alma R. Morales; Olga V. Przhonska; Sheng Yao

doi:10.1002/cphc.200600568

One- and two-photon singlet oxygen generation with new fluorene-based photosensitizers

Stephen J. Andrasik, Kevin D. Belfield, Mykhailo V. Bondar, Florencio E. Hernandez, Alma R. Morales, Olga V. Przhonska, Sheng Yao

Research output: Contribution to journal › Article › peer-review

31 Scopus citations

Abstract

The spectral properties of new fluorene-based photosensitizes for efficient singlet oxygen production are investigated at room temperature and 77 K. Two-photon absorption (2PA) cross-sections of the fluorene derivatives are measured by the open aperture Z-scan method. The quantum yields of singlet oxygen generation under one- and two-photon excitation (Φ_Δ and ^2PAΦ_Δ, respectively), are determined by the direct measurement of singlet oxygen luminescence at ≈1270 nm. The values of Φ_Δ are independent of excitation wavelength, ranging from 0.6-0.9. The singlet oxygen quantum yields under two-photon excitation are ^2PAΦ_Δ≈1/2Φ_Δ, indicating that the two processes exhibit the same mechanism of singlet oxygen production, independent of the mechanism of photon absorption.

Original language	English (US)
Pages (from-to)	399-404
Number of pages	6
Journal	ChemPhysChem
Volume	8
Issue number	3
DOIs	https://doi.org/10.1002/cphc.200600568
State	Published - Feb 19 2007
Externally published	Yes

All Science Journal Classification (ASJC) codes

Atomic and Molecular Physics, and Optics
Physical and Theoretical Chemistry

Keywords

Luminescence
Photochemistry
Photosensitizer
Singlet oxygen
Two-photon absorption

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10.1002/cphc.200600568

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title = "One- and two-photon singlet oxygen generation with new fluorene-based photosensitizers",

abstract = "The spectral properties of new fluorene-based photosensitizes for efficient singlet oxygen production are investigated at room temperature and 77 K. Two-photon absorption (2PA) cross-sections of the fluorene derivatives are measured by the open aperture Z-scan method. The quantum yields of singlet oxygen generation under one- and two-photon excitation (ΦΔ and 2PAΦΔ, respectively), are determined by the direct measurement of singlet oxygen luminescence at ≈1270 nm. The values of ΦΔ are independent of excitation wavelength, ranging from 0.6-0.9. The singlet oxygen quantum yields under two-photon excitation are 2PAΦΔ≈1/2ΦΔ, indicating that the two processes exhibit the same mechanism of singlet oxygen production, independent of the mechanism of photon absorption.",

keywords = "Luminescence, Photochemistry, Photosensitizer, Singlet oxygen, Two-photon absorption",

author = "Andrasik, {Stephen J.} and Belfield, {Kevin D.} and Bondar, {Mykhailo V.} and Hernandez, {Florencio E.} and Morales, {Alma R.} and Przhonska, {Olga V.} and Sheng Yao",

year = "2007",

month = feb,

day = "19",

doi = "10.1002/cphc.200600568",

language = "English (US)",

volume = "8",

pages = "399--404",

journal = "ChemPhysChem",

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T1 - One- and two-photon singlet oxygen generation with new fluorene-based photosensitizers

AU - Andrasik, Stephen J.

AU - Belfield, Kevin D.

AU - Bondar, Mykhailo V.

AU - Hernandez, Florencio E.

AU - Morales, Alma R.

AU - Przhonska, Olga V.

AU - Yao, Sheng

PY - 2007/2/19

Y1 - 2007/2/19

N2 - The spectral properties of new fluorene-based photosensitizes for efficient singlet oxygen production are investigated at room temperature and 77 K. Two-photon absorption (2PA) cross-sections of the fluorene derivatives are measured by the open aperture Z-scan method. The quantum yields of singlet oxygen generation under one- and two-photon excitation (ΦΔ and 2PAΦΔ, respectively), are determined by the direct measurement of singlet oxygen luminescence at ≈1270 nm. The values of ΦΔ are independent of excitation wavelength, ranging from 0.6-0.9. The singlet oxygen quantum yields under two-photon excitation are 2PAΦΔ≈1/2ΦΔ, indicating that the two processes exhibit the same mechanism of singlet oxygen production, independent of the mechanism of photon absorption.

AB - The spectral properties of new fluorene-based photosensitizes for efficient singlet oxygen production are investigated at room temperature and 77 K. Two-photon absorption (2PA) cross-sections of the fluorene derivatives are measured by the open aperture Z-scan method. The quantum yields of singlet oxygen generation under one- and two-photon excitation (ΦΔ and 2PAΦΔ, respectively), are determined by the direct measurement of singlet oxygen luminescence at ≈1270 nm. The values of ΦΔ are independent of excitation wavelength, ranging from 0.6-0.9. The singlet oxygen quantum yields under two-photon excitation are 2PAΦΔ≈1/2ΦΔ, indicating that the two processes exhibit the same mechanism of singlet oxygen production, independent of the mechanism of photon absorption.

KW - Luminescence

KW - Photochemistry

KW - Photosensitizer

KW - Singlet oxygen

KW - Two-photon absorption

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U2 - 10.1002/cphc.200600568

DO - 10.1002/cphc.200600568

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EP - 404

JO - ChemPhysChem

JF - ChemPhysChem

IS - 3

ER -

One- and two-photon singlet oxygen generation with new fluorene-based photosensitizers

Abstract

All Science Journal Classification (ASJC) codes

Keywords

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