Extending the concept of edge collection function to polygonal and curved planar luminescent waveguides

Fujieda, Ichiro

doi:10.1117/1.jpe.10.044501

Cited by 3 publications

(2 citation statements)

References 30 publications

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“…Let us denote this distance as r and the attenuation coefficient of the luminescent medium as  . The Lambert-Beer law states that the distance r attenuates the initial spectrum of the PL photons  analytically for LSCs with polygonal and curved luminescent plates [10]. Although such an analytical expression of col  would be useful, a further study is needed to extend this analysis to a leaf LSC.…”

Section: Collection Efficiencymentioning

confidence: 99%

Design considerations for leaf-inspired luminescent solar concentrators based on two-stage photoconversion

Nishimura,

Okada,

Suzuki

et al. 2023

Advances in Solar Energy: Heliostat Systems Design, Implementation, and Operation

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Concentration factor of an optical concentrator is defined as the ratio of photon fluxes at its incident and exiting surfaces. It is equal to the product of geometric gain and optical efficiency. Scaling up a luminescent solar concentrator (LSC) increases its geometric gain, but its optical efficiency decreases due to the loss of photoluminescence (PL) photons during the concentration process. In a leaf LSC, a luminescent fiber is coupled to the side surface of a luminescent plate such that an incident photon goes through two-stage photoconversion. Its geometric gain increases drastically but the second photoconversion process decreases its optical efficiency. In experiment, a 1.5 mm-diameter fiber was placed between two 2 mm-thick luminescent plates. The plates emitted green PL photons and the fiber converted them to red PL photons. Position-dependent optical efficiency was measured by exciting a single spot at various positions on the plate with a 1 mm-diameter laser light at 450 nm. The optical efficiency averaged over the incident area increased from 0.004 to 0.007 by decreasing the lateral size of the plate from 50 mm to 10 mm. Ray tracing simulations reproduced the measurement. A clear lightguide with arc-bend couplers can guide the PL photons from multiple luminescent fibers to a photovoltaic cell. By connecting N devices, N-fold increase in geometric gain is expected while the optical efficiency remains the same. Hence, this configuration provides a solution to the trade-off between geometric gain and optical efficiency.

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Section: Collection Efficiencymentioning

confidence: 99%

Design considerations for leaf-inspired luminescent solar concentrators based on two-stage photoconversion

Nishimura,

Okada,

Suzuki

et al. 2023

Advances in Solar Energy: Heliostat Systems Design, Implementation, and Operation

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“…LSC devices often consist of a transparent waveguide and a host material embedded with luminophores such as organic dyes or QDs that re‐emit incident light, often at a lower frequency [1,2] . The waveguides then redirect the re‐emitted light via total internal reflection to the edges, where photovoltaic (PV) cells can receive and generate energy [3–7] . The LSC devices’ high transparency and good color properties enable visible light to pass through undistorted, allowing LSCs to be used as windows for solar energy harvesting even in crowded urban areas [8–15] .…”

Section: Introductionmentioning

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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