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A global method for handling fluorescence spectra at high concentration derived from the competition between emission and absorption of colloidal CdTe quantum dots
Physical Chemistry Chemical Physics ( IF 2.9 ) Pub Date : 2017-09-06 00:00:00 , DOI: 10.1039/c7cp03484a Thomas Noblet 1, 2, 3, 4, 5 , Laurent Dreesen 6, 7, 8, 9, 10 , Julie Hottechamps 6, 7, 8, 9, 10 , Christophe Humbert 1, 2, 3, 4, 5
Physical Chemistry Chemical Physics ( IF 2.9 ) Pub Date : 2017-09-06 00:00:00 , DOI: 10.1039/c7cp03484a Thomas Noblet 1, 2, 3, 4, 5 , Laurent Dreesen 6, 7, 8, 9, 10 , Julie Hottechamps 6, 7, 8, 9, 10 , Christophe Humbert 1, 2, 3, 4, 5
Affiliation
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We investigate the effects of the concentration of CdTe quantum dots (QDs) on their fluorescence in water. The emission spectra, acquired in right angle geometry, exhibit highly variable shapes. The measurements evidence a critical value of the concentration beyond which the intensity and the spectral bandwidth decrease and the fluorescence maximum is redshifted. To account for these observations, we develop a model based on the primary and secondary inner filter effects. The accuracy of the model ensures that the concentration dependent behaviour of QD fluorescence is completely due to inner filter effects. This result is all the more interesting because it precludes the assumption of dynamic quenching. As a matter of fact, the decrease of the emission intensity is not a consequence of collisional quenching but an effect of competition between fluorescence and absorption. We even show that this phenomenon is linked not only to the QD concentration but also to the geometric configuration of the setup. Hence, our analytical model can be easily adapted to every fluorescence spectroscopy configuration to quantitatively predict or correct inner filter effects in the case of QDs or any fluorophore, and thus improve the handling of fluorescence spectroscopy for highly concentrated solutions.
中文翻译：
一种从胶态CdTe量子点的发射与吸收之间的竞争中获得的高浓度荧光光谱的全局处理方法
我们研究了CdTe量子点（QDs）的浓度对其在水中的荧光的影响。以直角几何形状采集的发射光谱呈现出高度可变的形状。测量结果证明了浓度的临界值，超过该临界值强度和光谱带宽会降低，并且荧光最大值会发生红移。为了解决这些问题，我们基于主要和次要内部滤镜效果开发了一个模型。模型的准确性可确保QD荧光的浓度依赖性行为完全归因于内部过滤器效应。该结果更令人感兴趣，因为它排除了动态淬灭的假设。事实上，发射强度的降低不是碰撞猝灭的结果，而是荧光与吸收之间竞争的结果。我们甚至表明，这种现象不仅与QD浓度有关，而且与装置的几何结构有关。因此，我们的分析模型可以轻松地适用于每种荧光光谱配置，以定量预测或校正QD或任何荧光团的内部过滤器效果，从而改善对高浓度溶液的荧光光谱处理。
更新日期：2017-09-20
中文翻译：
一种从胶态CdTe量子点的发射与吸收之间的竞争中获得的高浓度荧光光谱的全局处理方法
我们研究了CdTe量子点（QDs）的浓度对其在水中的荧光的影响。以直角几何形状采集的发射光谱呈现出高度可变的形状。测量结果证明了浓度的临界值，超过该临界值强度和光谱带宽会降低，并且荧光最大值会发生红移。为了解决这些问题，我们基于主要和次要内部滤镜效果开发了一个模型。模型的准确性可确保QD荧光的浓度依赖性行为完全归因于内部过滤器效应。该结果更令人感兴趣，因为它排除了动态淬灭的假设。事实上，发射强度的降低不是碰撞猝灭的结果，而是荧光与吸收之间竞争的结果。我们甚至表明，这种现象不仅与QD浓度有关，而且与装置的几何结构有关。因此，我们的分析模型可以轻松地适用于每种荧光光谱配置，以定量预测或校正QD或任何荧光团的内部过滤器效果，从而改善对高浓度溶液的荧光光谱处理。
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