Photon energy upconversion in porphyrins: one-photon hot-band absorption versus two-photon absorption

被引：66

作者：

Drobizhev, M

Karotki, A

Kruk, M

Krivokapic, A

Anderson, HL

Rebane, A ^{[1
]}

机构：

[1] Montana State Univ, Dept Phys, Bozeman, MT 59717 USA

[2] Univ Oxford, Dyson Perrins Lab, Dept Chem, Oxford OX1 3QY, England

来源：

CHEMICAL PHYSICS LETTERS | 2003年 / 370卷 / 5-6期

关键词：

D O I：

10.1016/S0009-2614(03)00162-3

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We study the porphyrin S-1 --> S-0 fluorescence and the photosensitized singlet oxygen (1)Delta(g) --> (3)Sigma(g) phosphorescence, both originating from absorption of photons with energy less than the porphyrin S-0 --> S-1 transition energy. By measuring the excitation intensity dependence of fluorescence at lowered sample temperatures, we are able to discriminate between two parallel processes of one-photon hot-band absorption (HBA) and simultaneous two-photon absorption (TPA). When the HBA and TPA contributions are comparable in magnitude, we use this new method to determine absolute TPA cross-section. We also demonstrate for the first time a singlet oxygen photo sensitization via HBA in porphyrin. (C) 2003 Elsevier Science B.V. All rights reserved.

引用

页码：690 / 699

页数：10

共 35 条

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