Photophysics at Unusually High Dye Concentrations,Accounts of Chemical Research

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Photophysics at Unusually High Dye Concentrations
Accounts of Chemical Research ( IF 16.4 ) Pub Date : 2018-11-28 00:00:00 , DOI: 10.1021/acs.accounts.8b00271
Hernán B. Rodríguez ₁ , Martín Mirenda ₂ , M. Gabriela Lagorio _{3,

4} , Enrique San Román _{3,

4}

Affiliation

The study of the interaction of light with systems at high dye concentrations implies a great challenge because several factors, such as emission reabsorption, dye aggregation, and energy trapping, hinder rationalization and interpretation of the involved photophysical processes. Space constraints induce dye interaction even in the absence of ground state stabilization of dimers and oligomers. At distances on the order of 1 nm, statistical energy traps are usually observed. At longer distances, excited state energy transfer takes place. Most of these factors do not result in ground state spectroscopic changes. Rather, fluorescence phenomena such as inner filter effects, concentration-dependent Stokes’ shifts, and changes in quantum yields and decay times are evidenced.

中文翻译：

染料浓度异常高时的光物理

在高染料浓度下，光与系统之间的相互作用的研究面临着巨大的挑战，因为若干因素（例如发射重吸收，染料聚集和能量陷阱）阻碍了所涉及的光物理过程的合理化和解释。即使在没有二聚体和低聚物的基态稳定的情况下，空间限制也会引起染料相互作用。在大约1 nm的距离上，通常会观察到统计能量陷阱。在更长的距离处，发生激发态能量转移。这些因素大多数不会导致基态光谱变化。而是可以证明荧光现象，例如内部滤光器效应，浓度依赖的斯托克斯位移以及量子产率和衰变时间的变化。

更新日期：2018-11-28

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