Time-resolved Photophysical Characterization of Triplet-harvesting Organic Compounds at an Oxygen-free Environment Using an iCCD Camera.
Time-resolved Photophysical Characterization of Triplet-harvesting Organic Compounds at an Oxygen-free Environment Using an iCCD Camera.
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使用 iCCD 相机在无氧环境中对三重态有机化合物进行时间分辨光物理表征。
DOI：
10.3791/56614
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
F. Dias
中科院分区：
文献类型：
--
作者：
Piotr Pander;P. Data;F. Dias
在这里，我们提出了一个明智的方法，使用超快的iCCD相机的时间分辨的光致发光的采集和分析。该系统能够采集覆盖从纳秒到0.1秒的时间范围的光致发光光谱。这使我们能够跟踪光谱的强度（衰减）和发射随时间的变化。使用这种方法，它是可能的，研究各种物理现象，如磷光的发射，并在分子中显示热激活延迟荧光（TADF）的即时和延迟荧光的贡献。值得注意的是，所有的光谱和衰变都是在一个实验中获得的。这可以用于固体（薄膜、粉末、晶体）和液体样品，其中唯一的限制是相机的光谱灵敏度和激发波长（532 nm、355 nm、337 nm和266 nm）。因此，这种技术是非常重要的，当调查在有机发光二极管和其他领域的应用，其中三重态收获是至关重要的有机发光体的激发态动力学。由于三重态被氧强烈猝灭，因此必须正确制备具有有效TADF发光或显示室温磷光（RTP）的发射体，以从溶液和膜中去除任何溶解的氧。否则，将观察不到长寿命发射。本工作中提出的固体样品脱气方法是基本和简单的，但液体样品的脱气产生了额外的困难，特别有趣。在这项工作中提出了一种方法，最大限度地减少溶剂损失和改变样品浓度，同时仍然能够以非常有效和可重复的方式去除氧气。
Here, we present a sensible method of the acquisition and analysis of time-resolved photoluminescence using an ultrafast iCCD camera. This system enables the acquisition of photoluminescence spectra covering the time regime from nanoseconds up to 0.1 s. This enables us to follow the changes in the intensity (decay) and emission of the spectra over time. Using this method, it is possible to study diverse photophysical phenomena, such as the emission of phosphorescence, and the contributions of prompt and delayed fluorescence in molecules showing thermally activated delayed fluorescence (TADF). Remarkably, all spectra and decays are obtained in a single experiment. This can be done for solids (thin film, powder, crystal) and liquid samples, where the only limitations are the spectral sensitivity of the camera and the excitation wavelength (532 nm, 355 nm, 337 nm, and 266 nm). This technique is, thus, very important when investigating the excited state dynamics in organic emitters for their application in organic light-emitting diodes and other areas where triplet harvesting is of paramount importance. Since triplet states are strongly quenched by oxygen, emitters with efficient TADF luminescence, or those showing room temperature phosphorescence (RTP), must be correctly prepared in order to remove any dissolved oxygen from solutions and films. Otherwise, no long-lived emission will be observed. The method of degassing solid samples as presented in this work is basic and simple, but the degassing of liquid samples creates additional difficulties and is particularly interesting. A method of minimizing solvent loss and changing the sample concentration, while still enabling to remove oxygen in a very efficient and a repeatable manner, is presented in this work.
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影响因子：
3.2
作者：
V. Jankus;K. Abdullah;Gareth C. Griffiths;H. Al-Attar;Yonghao Zheng;M. Bryce;A. Monkman
通讯作者：
V. Jankus;K. Abdullah;Gareth C. Griffiths;H. Al-Attar;Yonghao Zheng;M. Bryce;A. Monkman
激基复合物状态对吩嗪基 1,2,3-三唑发光探针磷光寿命的间接影响。
DOI：
10.1039/c6cp06134f
发表时间：
2017
期刊：
PCCP
影响因子：
--
作者：
Costa BB
通讯作者：
Costa BB
影响因子：
16.6
作者：
Data, Przemyslaw;Pander, Piotr;Monkman, Andrew P.
通讯作者：
Monkman, Andrew P.
影响因子：
3.7
作者：
Data, Przemyslaw;Kurowska, Aleksandra;Monkman, Andrew P.
通讯作者：
Monkman, Andrew P.