Saturable absorption dynamics in the triplet system and triplet excitation induced singlet fluorescence of some organic molecules
Saturable absorption dynamics in the triplet system and triplet excitation induced singlet fluorescence of some organic molecules
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DOI：
10.1016/s0301-0104(00)00355-4
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发表时间：
2001-01-15
期刊：
影响因子：
2.3
通讯作者：
Penzkofer, A
中科院分区：
文献类型：
--
作者：
Gratz, H;Penzkofer, A
氧杂蒽染料曙红Y的三重态饱和吸收行为。赤藓红B-和玫瑰红和富勒烯分子C-70的研究。分子被强烈的皮秒脉冲（波长λ（P）= 527 nm）激发到SI状态。它们通过系间跃迁主要弛豫到三重态。在单重态基态分子的透明区，用延时强皮秒脉冲（波长λ（L）= 1054 nm）研究了三重态-三重态可饱和吸收。通过对实验结果的数值模拟，确定了更高的激发态三重态吸收截面和更高的激发态三重态弛豫时间。时间分辨荧光测量揭示了更高的激发态三重态到单重态的背系间穿越和多步三倍频光电离。此外，在λ（L）= 1054 nm处的双光子吸收截面通过测量基本脉冲双光子诱导荧光相对于二次谐波脉冲单光子诱导荧光来确定。(C)2001 Elsevier Science B. V.保留所有权利。
The triplet saturable absorption behaviour of the xanthene dyes eosin Y. erythrosin B- and rose bengal and of the fullerene molecule C-70 is studied. The molecules are excited to the SI-state by intense picosecond pulses (wavelength lambda (P) = 527 nm). They relax dominantly to the triplet system by intersystem crossing. The triplet-triplet saturable absorption is investigated with time-delayed intense picosecond pulses (wavelength lambda (L) = 1054 nm) in the transparency region of the molecules in the singlet ground state. Higher excited-state triplet absorption cross-sections and higher excited-state triplet relaxation times are determined by numerical simulation of the experimental results. Time-resolved fluorescence measurements reveal higher excited-state triplet to singlet back-intersystem-crossing and multi-step tripler photoionization. Additionally the two-photon absorption cross-sections at lambda (L) = 1054 nm are determined by measurement of the fundamental pulse two-photon induced fluorescence relative to the second-harmonic pulse single-photon induced fluorescence. (C) 2001 Elsevier Science B.V. All rights reserved.