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Cellulose nanocrystals as host matrix and waveguide materials for recyclable luminescent solar concentrators

机译：纤维素纳米晶体作为可回收的发光太阳能聚光器的主体基质和波导材料

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摘要

The use of luminescent solar concentrators is a cost-effective approach that can efficiently concentrate direct and diffused sun light without any optical components. In this work, the prospect of cellulose nanocrystals (CNCs), an ecofriendly biopolymer, as a host matrix and waveguide for luminescent solar concentrators (LSCs) has been studied. The results show that the CNC material as a host matrix will absorb more photons, ensuring more photoluminescence from organic dyes compared to acrylic polymer emulsion, a common host matrix material in LSCs. Due to the light scattering effect within the CNC material, optical efficiency of the fabricated device decreases once the distance between the point where light hits the sample and the edge, from where photons get collected by the integrating sphere, is increased. Thus optimization of CNC film processing is required if the CNC film is used as a waveguide in LSCs. However the higher optical efficiency of CNC samples compared to acrylic polymer emulsion samples at shorter distances suggests its superior quality as a host matrix. A recyclability study reveals that the CNC material can be reused without compromising device quality, unlike acrylic polymer emulsion samples, which makes it a good candidate as an ecofriendly material for low cost, large scale manufacturing of luminescent solar concentrators.
机译：使用发光太阳能集中器是一种经济有效的方法，可以有效地聚集直接和漫射的太阳光，而无需任何光学组件。在这项工作中，已经研究了纤维素纳米晶体（CNCs）的前景，这是一种生态友好的生物聚合物，可以用作发光太阳能聚光器（LSCs）的基质和波导。结果表明，与丙烯酸酯聚合物乳液（LSC中常见的基质材料）相比，作为主体基质的CNC材料将吸收更多的光子，从而确保来自有机染料的更多光致发光。由于CNC材料内部的光散射效应，一旦光照射到样品的点与边缘之间的距离（从此处被积分球收集到的光子）增加，则制成的设备的光学效率就会降低。因此，如果将CNC薄膜用作LSC中的波导，则需要优化CNC薄膜加工。然而，与丙烯酸聚合物乳液样品相比，CNC样品在较短距离上的光学效率更高，表明其作为基质的质量较高。一项可回收性研究表明，与丙烯酸聚合物乳液样品不同，CNC材料可以重复使用而不会影响器件质量，这使其成为低成本，大规模生产发光太阳能聚光器的环保材料的良好选择。

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