Dichroic Perylene Bisimide Triad Displaying Energy Transfer in Switchable Luminescent Solar Concentrators
Dichroic Perylene Bisimide Triad Displaying Energy Transfer in Switchable Luminescent Solar Concentrators
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DOI：
10.1021/cm501508n
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发表时间：
2014-07-08
影响因子：
8.6
通讯作者：
Schenning, Albertus P. H. J.
中科院分区：
文献类型：
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作者：
ter Schiphorst, Jeroen;Kendhale, Amol M.;Schenning, Albertus P. H. J.
诸如光伏（PV）电池和发光太阳能聚光器（LSC）的光子器件需要发色团的受控分子组织，其中能量和电荷传输是有效和定向的，类似于在生物系统中发现的。1− 5例如，在LSC中，太阳光被收集、集中并导向光伏电池。在这样的设备中，嵌入在平面光导中的荧光团吸收太阳光并以更长的波长重新发射光，该光传播到边缘安装的PV。1，2，6，7 LSC也可以动态化，用于在城市地区结合光管理和太阳能发电。[8]在后一种设备中，荧光二色性染料使用液晶（LC）排列，[9 - 11]其中取向可以通过电场控制（图1）。高度有序的可切换系统对于实现“开”（透明）和“关”（暗）状态之间的高对比度是至关重要的，因为荧光团主要在平面排列中吸收。12最近，已经报道了几种方法来改善静态LSC中的太阳光收集和光耦合。树枝状聚合物已被用于通过光收集来扩大和增强光吸收，并采用能量转移来减少再吸收，这是LSC中的关键损失之一。1.制备了嵌在光学透明的可聚合LC波导中的取向的苝酰亚胺染料，导致光量子效率高达74%的高效LSC。还通过将正方形对称卟啉敏化剂的吸收与向垂直排列的发射体的能量转移相结合，获得了LSC中改进的光耦合。15我们现在报道一种多发色团三元组，其结合了光收集、有效的能量转移和优异的对准，可以应用于可切换窗户系统。
Photonic devices such as photovoltaic (PV) cells and luminescent solar concentrators (LSCs) require the controlled molecular organization of chromophores in which energy and charge transport is efficient and directional, similar to that found in biological systems. 1− 5 For example, in an LSC, sunlight is collected, concentrated, and directed to a PV cell. In such a device, a fluorophore embedded in a planar lightguide absorbs sunlight and re-emits light at a longer wavelength that travels to an edge-mounted PV. 1, 2, 6, 7 The LSC can also be made dynamic for combining light management and solar power generation in urban regions. 8 In these latter devices, fluorescent dichroic dyes are aligned using liquid crystals (LCs), 9− 11 where the orientation can be controlled by an electric field (Figure 1). Highly ordered switchable systems are critical to achieve high contrast ratios between “on”(transparent) and “off”(dark) states, as the fluorophore predominately absorbs in a planar alignment. 12 Recently, several approaches have been reported to improve the sunlight collection and the light incoupling in static LSCs. Dendrimers have been used to broaden and enhance light absorption by light harvesting and employ energy transfer to reduce reabsorption, 13 one of the key losses in LSCs. 1 Aligned perylene bisimide dyes embedded in an optically transparent polymerizable LC waveguide have been fabricated, leading to highly efficient LSCs with optical quantum efficiencies up to 74%. 14 Improved light coupling in an LSC has also been obtained by combining the absorption of a square-symmetric porphyrin sensitizer with energy transfer to a homeotropically aligned emitter. 15 We now report on a multichromophoric triad combining light harvesting, efficient energy transfer, and excellent alignment that can be applied in a switchable window system.