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Luminescent solar concentrators: boosted optical efficiency by polymer dielectric mirrors

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Abstract

We report on the optical efficiency enhancement of luminescent solar concentrators based on a push–pull fluorophore realized using high dielectric contrast polymer distributed Bragg reflectors as back mirrors. The Bragg stacks are obtained by alternating layers of cellulose acetate and thin films of a new stable and solution processable hydrated titania–poly(vinyl alcohol) nanocomposite (HyTiPVA) with a refractive index greater than 1.9 over a broad spectral range. The results obtained with these systems are compared with enhancements provided by standard Bragg reflectors made of commercial polymers. We demonstrate that the application of the Bragg stacks with photonic band-gap tuned to the low energy side of the dye emission spectrum induces a 10% enhancement of optical efficiency. This enhancement is the result of a photon recycling mechanism and is retained even in a scaled-up device where the Bragg mirrors are used in a mosaic configuration.

Graphical abstract: Luminescent solar concentrators: boosted optical efficiency by polymer dielectric mirrors

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Publication details

The article was received on 20 Nov 2018, accepted on 18 Dec 2018 and first published on 04 Jan 2019


Article type: Research Article
DOI: 10.1039/C8QM00595H
Citation: Mater. Chem. Front., 2019, Advance Article
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    Luminescent solar concentrators: boosted optical efficiency by polymer dielectric mirrors

    G. Iasilli, R. Francischello, P. Lova, S. Silvano, A. Surace, G. Pesce, M. Alloisio, M. Patrini, M. Shimizu, D. Comoretto and A. Pucci, Mater. Chem. Front., 2019, Advance Article , DOI: 10.1039/C8QM00595H

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