Integration of near-infrared harvesting transparent luminescent solar concentrators onto arbitrary surfaces

Yang, Chenchen; Liu, Dianyi; Renny, Alexander; Kuttipillai, Padmanaban S.; Lunt, Richard R.

doi:10.1016/j.jlumin.2019.02.042

Cited by 22 publications

(15 citation statements)

References 63 publications

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“…For more practical deployment, this air gap can be replaced with a low refractive index polymer, [34][35][36] metal oxide, [37][38][39][40][41] or glue with only a small change in the performance. [42] The top UV component is based on phosphorescent hexanuclear NCs, where the chemical structure of Cs 2 Mo 6 I 8 (CF 3 CF 2 COO) 6 NC is shown in Figure 1B (the synthesis is described in the Experimental Section). Substitution of the apical halide positions has been shown previously to be an effective approach to increase QYs above 50%.…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

“…For more practical deployment, this air gap can be replaced with a low refractive index polymer, [ 34–36 ] metal oxide, [ 37–41 ] or glue with only a small change in the performance. [ 42 ]…”

Section: Resultsmentioning

confidence: 99%

“…Given the similarity in the decay trend in each range of the EQE LSC spectra, the isolation of the waveguides effectively enables total internal reflection within each waveguide so that the UV and NIR components operate nearly independently. Notably, such optical isolation was also realized by seamlessly inserting a low refractive index layer ( n = 1.30) between the two waveguides (see Note S8, Supporting Information, for comparison), [ 42 ] which can enhance the device structural stability for a greater range of applications. Improvements in scalability to the largest device sizes are likely achievable via Stokes shift engineering which has led to values over 100 nm for single‐fluorescent emitters (see Note S7, Supporting Information, for detail), and more specifically, following chemical approaches that reduce OIs.…”

Section: Resultsmentioning

confidence: 99%

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Ultraviolet and Near‐Infrared Dual‐Band Selective‐Harvesting Transparent Luminescent Solar Concentrators

Yang

Sheng

Moemeni

et al. 2021

Advanced Energy Materials

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Practical deployment of TPV technologies requires high power conversion efficiency (PCE) with high aesthetic quality including high average visible transmittance (AVT) and color rendering index (CRI), which can be simultaneously achieved by preferentially harvesting the ultraviolet (UV) and near-infrared (NIR) parts of the solar spectrum. [1,6] Therefore, it is beneficial to simultaneously fine-tune the absorption cutoff edges precisely at the UV/visible (VIS) and VIS/NIR borders to maximize the visible transmission (435-675 nm). [1,3,4] In the past 5 years, efforts have been made to achieve high PCE and visible transparency in TPVs. For example, the bandgaps of organometallic halide perovskite materials were sensitively tuned by compositional engineering for UV-selective-harvesting TPVs; [7,8] a series of novel low-bandgap polymer donors and non-fullerene acceptors have been applied in organic PV devices, [9,10] and excellent photovoltaic performance with distinct NIR selectivity has been demonstrated; [7,9,11-14] tandem architectures have also been utilized in TPVs to selectively harvest both UV and NIR portion of the incident solar spectrum, substantially reducing thermal losses and improving the output photovoltaic performance despite limitations imposed by current-voltage matching; [7,12] the utilization of optical outcoupling layers for VIS photons and various types of transparent electrodes can simultaneously enhance the visible transparency and the utilization of invisible photons. [11] Currently, the PCE of thin-film TPVs have reached ≈8-10%, however, the highest reported AVT is around 40-50% due to considerable parasitic absorption from the electrodes, active layers, and non-ideal wavelength-selectivity. [11,12,15] Alternatively, transparent luminescent solar concentrators (TLSCs) optically shift the solar energy conversion to edgemounted traditional PV cells via waveguided photoluminescence (PL) and total internal reflection. Without the presence of electrodes and device patterning, the structural simplicity substantially improves the defect tolerance and enables TLSCs with distinct wavelength-selectivity to achieve the highest possible visible transparency, circumventing several of the challenges for thin-film TPVs and simplifying the manufacturing. [1,3,5] Much of the previous work on TLSCs with NIR harvesting have absorption profiles that have limited UV capture with PCEs up to around 1% and AVTs above 70% for a light utilization efficiency (LUE, equal to PCE × AVT, which is introduced Visibly transparent luminescent solar concentrators (TLSC) can optimize both power production and visible transparency by selectively harvesting the invisible portion of the solar spectrum. Since the primary applications of TLSCs include building envelopes, greenhouses, automobiles, signage, and mobile electronics, maintaining aesthetics and functionalities is as important as achieving high power conversion efficiencies (PCEs) in practical deployment. In this work, massive-downshifting phosphorescent nanoclusters and ...

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Ultraviolet and Near‐Infrared Dual‐Band Selective‐Harvesting Transparent Luminescent Solar Concentrators

Yang

Sheng

Moemeni

et al. 2021

Advanced Energy Materials

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“…The transparency allows for unconventional photovoltaic applications such as in BIPVs. Improving the performance of LSC devices for a wider range of applications is crucial to meeting energy goals for a more sustainable Earth [114–119] …”

Section: Luminescent Solar Concentratorsmentioning

confidence: 99%

Review on Colloidal Quantum Dots Luminescent Solar Concentrators

et al. 2021

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Luminescent solar concentrators (LSCs) have recently gained popularity as an effective solution to increase solar energy conversion. Utilizing LSCs together with solar cells can generate more energy at a lower cost than using only solar cells. LSCs operate by utilizing luminophores, molecules that absorb incident solar irradiation and re‐emit photons, and waveguides that redirect emitted photons to the edges of a glass or polymer slab at high concentrations. Many quantum dots (QDs) have been the focus of much research as luminophores for LSCs, owing to their high quantum yields (QYs), controllable absorption/emission spectra, good stability, and ease of synthesis. Various QDs, such as CdSe, PbS, CdS, AgInS2, Si, and C, have been modified to enhance their optical performances in LSCs, often measured by their optical efficiencies, internal/external quantum efficiencies, and power conversion efficiencies. This review appraises the latest developments in colloidal QDs—basic QDs, doped QDs, core/shell QDs, hybrid QDs, and Si‐based QD—for their applications in LSCs. Other factors that enhance an LSC's efficiency, such as altering the polymer matrix and using distributed Bragg reflectors, are discussed. The development of highly efficient, QD‐based LSCs will be essential for increasing solar energy production worldwide.

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Luminescent light diffuser for diffuse lighting applications

et al. 2022

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The lighting industry currently accounts for a significant proportion of all energy demand. Luminescent white lighting is often impure, inefficient, expensive, and detrimentally emits as a point source, meaning the light is emitted from a focused point. A luminescent light diffuser offers the potential to create a spatially broad lighting fixture. We developed a luminescent light diffuser consisting of three commercially available luminescent dye species (rhodamine 6G, fluorescein, 7‐diethylamino‐4‐methylcoumarin) dispersed within a polymer matrix (polyvinyl alcohol), or commercial paint, and coated on a planar waveguide. A Light‐emitting diode (LED) (385 nm) is directed into the waveguide which excites the luminescent species, coating the panel, creating a device that emits spatially broad pure white light. As the emission depends on escape cone emission from the waveguide, the device’s emission was found to depend highly on the coating film quality and components. We present two systems: a small 40 mm × 40 mm prototype, made using standard water‐soluble polymer (polyvinyl alcohol), to study the underlying operational principles, and a 100 mm × 100 mm device with optimized efficiency fabricated with a clear commercial paint. By doping the polymer matrix with scattering silica microparticles we achieved a maximum photon outcoupling efficiency of 78%, whilst maintaining colour purity with an increased device size of more than 300 times (compared with the input LED). This work shows that it is possible to construct an inexpensive and spatially broad lighting source, whilst maintaining colour purity at a low cost.

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Integration of near-infrared harvesting transparent luminescent solar concentrators onto arbitrary surfaces

Cited by 22 publications

References 63 publications

Ultraviolet and Near‐Infrared Dual‐Band Selective‐Harvesting Transparent Luminescent Solar Concentrators

Ultraviolet and Near‐Infrared Dual‐Band Selective‐Harvesting Transparent Luminescent Solar Concentrators

Review on Colloidal Quantum Dots Luminescent Solar Concentrators

Luminescent light diffuser for diffuse lighting applications

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