Guest-host devices using anisotropic dyes

Scheffer, T. J.

doi:10.1098/rsta.1983.0033

Cited by 19 publications

(1 citation statement)

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“…The previous section has considered the various guest-host LC systems that have been investigated as a means to impart anisotropy to the absorbance and emission properties of a luminescent concentrator so as to improve the emission from the edges and/or reduce the surface losses. The alignment of the dye is mainly determined by a combination of the chemical structure of the dye, the orientational order of the LC host, and the interaction between the dye and the LC host [32,68,69]. In parallel with the studies described in the previous section, the research community has also considered how to improve the dyes themselves and/or the dye combinations to further enhance the alignment and the performance of these LC luminescent concentrators.…”

Section: Optimizing the Dye Structures And Combinationsmentioning

confidence: 99%

Liquid Crystals for Luminescent Concentrators: A Review

Surampudi,

Zhang,

Singh

et al. 2023

Crystals

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Luminescent optical concentrators are thin films containing fluorescent dyes that enable light collection over a wide field of view without the need to track the path of the Sun. However, a disadvantage when using luminescent concentrators is that the performance is often impeded by surface losses through these films. Liquid-crystal (LC) hosts are attractive for luminescent concentrators, as they impart, at the very least, an orientational ordering to the transition dipole moment of the dyes dispersed within these films. This enables the directivity of both the absorption and emission and can reduce surface losses by, for example, adopting the homeotropic alignment of the LC director. This article reviews the developments and applications of LCs to luminescent optical concentrators and describes the strategies that have been introduced to further combat losses by decoupling the absorption and emission processes through Förster energy transfer, the approaches employed to enhance the chemical structures of the dyes, and the methods of using alternative LC phases and external configurations. The review presents a comprehensive summary of the material combinations and the techniques that have been considered in the development of LC-based concentrator films and concludes with a discussion about the future perspectives for these exciting optical concentrators.

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Section: Optimizing the Dye Structures And Combinationsmentioning

confidence: 99%