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Characterization and reduction of reabsorption losses in luminescent solar concentrators

机译：发光太阳能聚光器的表征和降低重吸收损失

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摘要

The effects of excitation wavelength on the optical properties (emission spectrum and quantum yield) of a luminescent solar concentrator (LSC) containing a fluorescent organic dye (Lumogen F Rot 305) are studied. Excitation at wavelengths on the long-wavelength edge of the absorption spectrum of the dye results in redshifted emission, but the quantum yield remains constant at 100percent. The origin of this effect and its consequences are discussed. The extent of the long-wavelength tail of the absorption spectrum of the dye is determined and the importance in reabsorption losses is shown. The optical efficiencies and photon transport probabilities of LSCs containing either an organic dye or a rare-earth lanthanide complex are compared using ray-tracing simulations and experiment. The optical efficiency is shown to depend strongly on the Stokes shift of the fluorophore. The lanthanide complex, which has a very large Stokes shift, exhibits a higher optical efficiency than the dye (64percent cf. 50percent), despite its lower quantum yield (86percent cf. 100percent).
机译：研究了激发波长对包含荧光有机染料（Lumogen F Rot 305）的发光太阳能集中器（LSC）的光学性能（发射光谱和量子产率）的影响。染料吸收光谱的长波长边缘上的波长处的激发导致红移发射，但量子产率保持恒定在100％。讨论了这种影响的根源及其后果。确定了染料吸收光谱的长波长尾巴的程度，并显示了在重吸收损失中的重要性。使用射线追踪模拟和实验比较了包含有机染料或稀土镧系元素络合物的LSC的光学效率和光子传输概率。光学效率在很大程度上取决于荧光团的斯托克斯位移。尽管其量子产率较低（86％，相对于100％），但具有很大的斯托克斯位移的镧系元素络合物却比染料（64％，相对于50％）具有更高的光学效率。

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