Photon energy upconversion in porphyrins: one-photon hot-band absorption versus two-photon absorption
Photon energy upconversion in porphyrins: one-photon hot-band absorption versus two-photon absorption
复制标题
DOI：
10.1016/s0009-2614(03)00162-3
复制
发表时间：
2003-03-21
影响因子：
2.8
通讯作者：
Rebane, A
中科院分区：
文献类型：
--
作者：
Drobizhev, M;Karotki, A;Rebane, A
我们研究了卟啉S-1—> S-0荧光和光敏化单线态氧(1)δ (g)—> (3)Sigma(g)磷光，两者都是由于吸收能量小于卟啉S-0—> S-1跃迁能的光子而产生的。通过测量在较低样品温度下荧光的激发强度依赖性，我们能够区分单光子热带吸收（HBA）和同时双光子吸收（TPA）两个平行过程。当HBA和TPA的贡献在量级上相当时，我们使用这种新方法来确定绝对TPA横截面。我们还首次在卟啉中通过HBA证明了单线态氧光敏。(C) 2003 Elsevier Science B.V.版权所有
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.