Excitation energy transfer and trapping in dye-loaded solid particles
Excitation energy transfer and trapping in dye-loaded solid particles
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DOI：
10.1196/annals.1430.028
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发表时间：
2008-01-01
期刊：
影响因子：
--
通讯作者：
Roman, Enrique San
中科院分区：
文献类型：
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作者：
Rodriguez, Hernan B.;Roman, Enrique San
考虑到光散射和内部过滤效应，在高染料浓度的干燥固态下研究了由附着在固体颗粒上的单一染料或成对染料组成的几个系统的光物理学。染料分子之间的相互作用和单线态能量转移在这些条件下是相关的，正如具有适当光谱重叠的染料对所证明的那样。对于单一染料，在校正辐射能量转移后，随着表面浓度的增加观察到荧光猝灭。这种效应可以通过两种不同的捕获模型来解释。无论陷阱的性质如何，浓度猝灭可以是静态（陷阱吸收）和动态（能量转移）性质的。解开能量捕获机制是开发高效光活性固体材料的关键。
The photophysics of several systems composed of a single dye or pairs of dyes attached to solid particles has been studied in the dry solid state at high dye concentrations taking into account light scattering and inner filter effects. Interaction among dye molecules and singlet-singlet energy transfer are relevant in these conditions, as has been demonstrated for pairs of dyes with suitable spectral overlap. For single dyes, after correction for radiative energy transfer, fluorescence quenching is observed as the surface concentration increases. This effect is explained by two different trapping models. Irrespective of the nature of the traps, concentration quenching may be of static (trap absorption) and dynamic (energy transfer) nature. The unraveling of energy trapping mechanisms is a key to the development of efficient photoactive solid materials.