Dye-integrated cholesteric photonic luminescent solar concentrator

Rodarte, Andrea L.; Cisneros, Fredy; Hirst, Linda S.; Ghosh, Sayantani

doi:10.1080/02678292.2014.924163

Cited by 12 publications

(8 citation statements)

References 27 publications

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“…This phenomenon can be exploited in the field of display technology as reflection-type LC displays, [9][10][11][12][13] or in polarisers, filters, [14] lasers, [15] smart windows, [16] shutters [17] and solar concentrators. [18] For the same reasons, the CLC property to change colour with temperature [19,20] or substrate bending [21] can also be exploited. As mentioned earlier, a CLC can be obtained by a pure compound with a chiral centre or by a solution of even small quantities of chiral molecules dissolved in a nematic LC.…”

Section: Induced Cholesteric Solutions Of Highly Soluble Bissalicylalmentioning

confidence: 99%

Induced cholesteric solutions of highly soluble bis-salicylaldiminate Cu(II) metallomesogens and their rheological behaviour

et al. 2015

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Copper(II) complexes containing chiral centres and functionalised with citronellyl end groups were synthesised.\ud Isomerisation of citronellyl double bond was exploited to decrease the melting temperature of the complexes and\ud improve their solubility in organic media. The chiral metallomesogens were successfully used to produce induced\ud cholesteric solutions in commercial nematic liquid crystals also in high concentrations. Transparent and coloured\ud thin films were easily obtained showing good reflective properties across the visible spectrum. The rheological\ud behaviour of the nematic and the cholesteric phases was investigated. The nematic system showed the characteristics\ud of a tumbling phase with a very peculiar transient behaviour. The cholesteric samples also showed a very\ud unusual, flow-history-dependent transient behaviour. The viscosity trend presumably indicates a flow-induced\ud orientation of the cholesteric superstructure, thus opening the way to the possibility of tuning the yield stress level\ud of the material. The results support the potentiality of these compounds for applications in light reflecting\ud technology

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Section: Induced Cholesteric Solutions Of Highly Soluble Bissalicylalmentioning

confidence: 99%

Induced cholesteric solutions of highly soluble bis-salicylaldiminate Cu(II) metallomesogens and their rheological behaviour

et al. 2015

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“…The CLC tunability makes the investigated structure useful for various optical devices, such as sensors and solar cells [38]. In this case, the light is localized in different geometrical parts of the structure at different frequencies.…”

Section: Controlling the Spectral Propertiesmentioning

confidence: 99%

Localized optical modes in a defect-containing liquid-crystal structure adjacent to the metal

2017

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The possibility of existence of the localized optical states with the maximum field intensity at the interface between the metal and cholesteric liquid crystal in a defect-containing cholesteric liquid crystal is theoretically grounded. It is established that the localization occurs at almost any defect thicknesses rather than only at the half-wave thickness, at which the loss of the polarization dependence of diffraction reflection and the absence of field localization are observed for the structure without the metallic layer. It is demonstrated that the spectral properties can be controlled by external fields affecting the liquid crystal. At large thicknesses of the cholesteric liquid crystal between the defect and metallic layer, the spectrum contains the pronounced peaks corresponding to the edge modes. The results obtained open new opportunities for controlling the transmittance spectrum, polarization and localization of light in optoelectronic elements based on the investigated system.

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“…43 Attempts to evaluate the effect of selfabsorption on the LSC optical performances have been thoroughly reviewed in the literature. 40,[68][69][70][71] Re-absorption of emitted photons by subsequent dye molecules via overlap of emission and absorption bands appears to be the limiting factor in respect to the efficiency of the concentrator. 14,72 Moreover, a more red-shied emission agrees better with the typical responsivity curve of photodiodes (Fig.…”

Section: Optical Characterization Of the Znl/pmma Lmsmentioning

confidence: 99%

Cost-effective solar concentrators based on red fluorescent Zn(ii)–salicylaldiminato complex

et al. 2016

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Sunlight concentration is a promising path to cost-effective photovoltaic (PV) technologies. Compared to standard concentrators based on geometrical optics, luminescent solar concentrators (LSCs) appear to be viable and convenient alternatives because sunlight concentration to PV occurs with diffuse light and there is no need for sun tracking or cooling apparatuses. In this study, we report on the optical efficiencies of luminescent solar concentrators (LSCs) based on poly(methyl methacrylate) (PMMA) thin films doped with a red-emitting zinc(II) complex of the D–A–D type ligand N,N0-bis(2-hydroxy-1-naphthylidene)-diaminomaleonitrile (ZnL). ZnL is attractive for use in LSC owing to its easy and cheap synthesis. ZnL in PMMA shows an emission band at 624 nm, a Stokes shift of 34 nm and an average QY of 23%, data comparable to those recorded in solution and efficiently predicted by DFT calculations. A study of ZnL/PMMA LSC yields optical efficiencies of 7%, which is comparable to those based on the near unity QY fluorophores such as Lumogen Red. These performances were attributed to the higher emission redshift and larger Stokes shift of ZnL that prevent the loss of efficiencies due to self-absorption and possibly circumvent its lower QY

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Dye-integrated cholesteric photonic luminescent solar concentrator

Cited by 12 publications

References 27 publications

Induced cholesteric solutions of highly soluble bis-salicylaldiminate Cu(II) metallomesogens and their rheological behaviour

Induced cholesteric solutions of highly soluble bis-salicylaldiminate Cu(II) metallomesogens and their rheological behaviour

Localized optical modes in a defect-containing liquid-crystal structure adjacent to the metal

Cost-effective solar concentrators based on red fluorescent Zn(ii)–salicylaldiminato complex

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