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Tuning Optical Properties by Controlled Aggregation: Electroluminescence Assisted by Thermally-Activated Delayed Fluorescence from Thin Films of Crystalline Chromophores.
Chemistry - A European Journal ( IF 3.9 ) Pub Date : 2020-09-07 , DOI: 10.1002/chem.202003712 Ritesh Haldar 1 , Marius Jakoby 2 , Mariana Kozlowska 3 , Motiur Rahman Khan 4 , Hongye Chen 1, 5 , Yohanes Pramudya 3 , Bryce S Richards 2, 4 , Lars Heinke 1 , Wolfgang Wenzel 3 , Fabrice Odobel 6 , Stéphane Diring 6 , Ian A Howard 2, 4 , Uli Lemmer 2, 4 , Christof Wöll 1
Chemistry - A European Journal ( IF 3.9 ) Pub Date : 2020-09-07 , DOI: 10.1002/chem.202003712 Ritesh Haldar 1 , Marius Jakoby 2 , Mariana Kozlowska 3 , Motiur Rahman Khan 4 , Hongye Chen 1, 5 , Yohanes Pramudya 3 , Bryce S Richards 2, 4 , Lars Heinke 1 , Wolfgang Wenzel 3 , Fabrice Odobel 6 , Stéphane Diring 6 , Ian A Howard 2, 4 , Uli Lemmer 2, 4 , Christof Wöll 1
Affiliation
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Several photophysical properties of chromophores depend crucially on intermolecular interactions. Thermally‐activated delayed fluorescence (TADF) is often influenced by close packing of the chromophore assembly. In this context, the metal‐organic framework (MOF) approach has several advantages: it can be used to steer aggregation such that the orientation within aggregated structures can be predicted using rational approaches. We demonstrate this design concept for a DPA‐TPE (diphenylamine‐tetraphenylethylene) chromophore, which is non‐emissive in its solvated state due to vibrational quenching. Turning this DPA‐TPE into a ditopic linker makes it possible to grow oriented MOF thin films exhibiting pronounced green electroluminescence with low onset voltages. Measurements at different temperatures clearly demonstrate the presence of TADF. Finally, this work reports that the layer‐by‐layer process used for MOF thin film deposition allows the integration of the TADF‐DPA‐TPE in a functioning LED device.
中文翻译：
通过控制聚集来调节光学性能：晶体发色团薄膜的热激活延迟荧光辅助的电致发光。
生色团的几种光物理性质关键取决于分子间的相互作用。热激活延迟荧光（TADF）通常受发色团组件紧密堆积的影响。在这种情况下，金属有机框架（MOF）方法具有几个优点：可用于引导聚集，以便可以使用合理的方法预测聚集结构内的方向。我们证明了DPA-TPE（二苯胺-四苯基乙烯）生色团的设计理念，该生色团由于振动淬灭而在溶剂化状态下不发光。将这种DPA-TPE变成对位连接体，可以生长取向MOF薄膜，该薄膜在低启动电压下显示出明显的绿色电致发光。在不同温度下的测量清楚地表明了TADF的存在。最后，
更新日期：2020-09-07
中文翻译：
通过控制聚集来调节光学性能：晶体发色团薄膜的热激活延迟荧光辅助的电致发光。
生色团的几种光物理性质关键取决于分子间的相互作用。热激活延迟荧光（TADF）通常受发色团组件紧密堆积的影响。在这种情况下，金属有机框架（MOF）方法具有几个优点：可用于引导聚集，以便可以使用合理的方法预测聚集结构内的方向。我们证明了DPA-TPE（二苯胺-四苯基乙烯）生色团的设计理念，该生色团由于振动淬灭而在溶剂化状态下不发光。将这种DPA-TPE变成对位连接体，可以生长取向MOF薄膜，该薄膜在低启动电压下显示出明显的绿色电致发光。在不同温度下的测量清楚地表明了TADF的存在。最后，
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