Spectral-based analysis of thin film luminescent solar concentrators

Dienel, Thomas; Bauer, Christophe; Dolamic, Igor; Brühwiler, Dominik

doi:10.1016/j.solener.2010.04.015

Cited by 72 publications

(59 citation statements)

References 30 publications

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“…in the form of luminescent solar concentrators. 3,4,[22][23][24][25] Advanced optical microscopy techniques have enabled researchers to obtain detailed information regarding the properties of the guests. 11,[26][27][28][29][30][31] However, modeling studies needed for interpreting and understanding the experimental data remain challenging, mainly because of the considerable extension of the systems to be handled in the calculations.…”

Section: Introductionmentioning

confidence: 99%

First-principles simulation of the absorption bands of fluorenone in zeolite L

Zhou

Wesołowski

Tabacchi

et al. 2013

Phys. Chem. Chem. Phys.

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The absorption spectrum of fluorenone in zeolite L is calculated from first-principles simulations. The broadening of each band is obtained from the explicit treatment of the interactions between the chromophore and its environment in the statistical ensemble. The comparison between the simulated and measured spectra reveals the main factors affecting the spectrum of the chromophore in hydrated zeolite L. Whereas each distinguishable band is found to originate from a single electronic transition, the bandwidth is determined by the statistical nature of the environment of the fluorenone molecule. The K + Á Á ÁOQC motif is retained in all conformations. Although the interactions between K + and the fluorenone carbonyl group result in an average lengthening of the CQO bond and in a redshift of the lowest energy absorption band compared to gas phase or non-polar solvents, the magnitude of this shift is noticeably smaller than the total shift. An important factor affecting the shape of the band is fluorenone's orientation, which is strongly affected by the presence of water.The effect of direct interactions between fluorenone and water is, however, negligible.

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Section: Introductionmentioning

confidence: 99%

First-principles simulation of the absorption bands of fluorenone in zeolite L

Zhou

Wesołowski

Tabacchi

et al. 2013

Phys. Chem. Chem. Phys.

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“…The performance of the F6-Eu thin film as a LSC is given by the optical conversion efficiency η opt of the collector, which is defined as 8,11,13 …”

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confidence: 99%

Modulating the Photoluminescence of Bridged Silsesquioxanes Incorporating Eu³⁺-Complexed n,n′-Diureido-2,2′-bipyridine Isomers: Application for Luminescent Solar Concentrators

et al. 2011

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Two new urea-bipyridine derived bridged organosilanes (P5 and P6) have been synthesized and their hydrolysis–condensation under nucleophilic catalysis in the presence of Eu3+ salts led to luminescent bridged silsesquioxanes (M5-Eu and M6-Eu). An important loading of Eu3+ (up to 11%w) can be obtained for the material based on the 6,6′-isomer. Indeed the photoluminescence properties of these materials, that have been investigated in depth (photoluminescence (PL), quantum yield, lifetimes), show a significantly different complexation mode of the Eu3+ ions for M6-Eu, compared with M4-Eu (obtained from the already-reported 4,4′-isomer) and M5-Eu. Moreover, M6-Eu exhibits the highest absolute emission quantum yield value (0.18 ± 0.02) among these three materials. The modification of the sol composition upon the addition of a malonamide derivative led to similar luminescent features but with an increased quantum yield (0.26 ± 0.03). In addition, M6-Eu can be processed as thin films by spin-coating on glass substrates, leading to plates coated by a thin layer (∼54 nm) of Eu3+-containing hybrid silica exhibiting one of the highest emission quantum yields reported so far for films of Eu3+-containing hybrids (0.34 ± 0.03) and an interesting potential as new luminescent solar concentrators (LSCs) with an optical conversion efficiency of ∼4%. The ratio between the light guided to the film edges and the one emitted by the surface of the film was quantified through the mapping of the intensity of the red pixels (in the RGB color model) from a film image. This quantification enabled a more accurate estimation of the transport losses due to the scattering of the emitted light in the film (0.40), thereby correcting the initial optical conversion efficiency to a value of 1.7%.

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“…The quantum efficiency of an LSC depends on many different factors, such as the light in-coupling efficiency, the light harvesting efficiency [4], the luminescence quantum efficiency [5], the light trapping efficiency [6], and the waveguide efficiency [7,8]. But one of the main factors limiting the overall LSC efficiency is the losses associated with selfabsorption [9].…”

Section: Introductionmentioning

confidence: 99%

“…This spectral overlap results in substantial reabsorption of the emitted light before the photons can reach the edges of the LSC where the PV cells are attached. Although reabsorption can again result in reemission, nonunity luminescence quantum efficiency and nonunity light trapping efficiency significantly limit the fraction of light that finally reaches the LSC-PV interface [4,7,10].…”

Section: Introductionmentioning

confidence: 99%

Quantifying self-absorption losses in luminescent solar concentrators

2014

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Analytical equations quantifying self-absorption losses in circular luminescent solar concentrators (LSCs) are presented that can easily be solved numerically by commercial math software packages. With the quantum efficiency, the absorption and emission spectra of a luminescent material, the LSC dimensions, and the refractive index as the only input parameters, the model gives an accurate account of the decrease of LSC efficiency due to self-absorption as a function of LSC radius, thickness, and luminescence quantum efficiency. Results give insight into how many times light is reabsorbed and reemitted, the red shift of the emission spectrum, and on how multiple reabsorptions and reemissions are distributed over the LSC. As an example case the equations were solved for a circular LSC containing a Lumogen F Red 305 dye with 80% luminescence quantum efficiency, and it follows that for an LSC with a 50 cm radius the self-absorption reduces the number of photons reaching the LSC edge by a factor of four compared to the case when there would be no self-absorption. The equations can just as well be solved for any material for which the optical properties are known like type I and type II quantum dots.

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Spectral-based analysis of thin film luminescent solar concentrators

Cited by 72 publications

References 30 publications

First-principles simulation of the absorption bands of fluorenone in zeolite L

First-principles simulation of the absorption bands of fluorenone in zeolite L

Modulating the Photoluminescence of Bridged Silsesquioxanes Incorporating Eu³⁺-Complexed n,n′-Diureido-2,2′-bipyridine Isomers: Application for Luminescent Solar Concentrators

Quantifying self-absorption losses in luminescent solar concentrators

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Spectral-based analysis of thin film luminescent solar concentrators

Cited by 72 publications

References 30 publications

First-principles simulation of the absorption bands of fluorenone in zeolite L

First-principles simulation of the absorption bands of fluorenone in zeolite L

Modulating the Photoluminescence of Bridged Silsesquioxanes Incorporating Eu3+-Complexed n,n′-Diureido-2,2′-bipyridine Isomers: Application for Luminescent Solar Concentrators

Quantifying self-absorption losses in luminescent solar concentrators

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Modulating the Photoluminescence of Bridged Silsesquioxanes Incorporating Eu³⁺-Complexed n,n′-Diureido-2,2′-bipyridine Isomers: Application for Luminescent Solar Concentrators