Title

One- And Two-Photon Singlet Oxygen Generation With New Fluorene-Based Photosensitizers

Keywords

Luminescence; Photochemistry; Photosensitizer; Singlet oxygen; Two-photon absorption

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. © 2007 Wiley-VCH Verlag GmbH & Co. KGaA.

Publication Date

2-19-2007

Publication Title

ChemPhysChem

Volume

8

Issue

3

Number of Pages

399-404

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1002/cphc.200600568

Socpus ID

33847282812 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/33847282812

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