Characterization of a liquid crystal/dye cell for a future application in display-integrated photovoltaics

Fujieda, Ichiro; Itaya, Shunsuke; Ohta, Masamichi; Ozawa, Shintaro; Azmi, Nada Dianah Binti M

doi:10.1117/1.jpe.6.028001

Cited by 6 publications

(2 citation statements)

References 18 publications

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“…Display-integrated photovoltaic is a concept in which power generation function is added to a display [1]. One can build such a system by replacing the screen of a laser phosphor display [2] with a luminescent solar concentrator (LSC) [3].…”

Section: Introductionmentioning

confidence: 99%

28‐4: Fabrication and Operation of an Energy‐Harvesting Color Projector

Fujieda

Kohmoto

Yunoki

et al. 2019

Symp Digest of Tech Papers

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We have fabricated a 50mm x 50mm x 10mm waveguide that contained an array of stripe-shaped luminescent materials for three primary colors. By exciting these stripes with a modulated blue laser light, color images are displayed. Solar cells attached to its edge surface generate electric power by collecting photoluminescence photons not utilized for displaying images. The first device recovers only a very small fraction of the incoming optical power (about 1/4000) because the photons are scattered and lost during wave-guiding. This fraction would approach the theoretical limit of 0.75 by eliminating the scattering event.

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Section: Introductionmentioning

confidence: 99%

28‐4: Fabrication and Operation of an Energy‐Harvesting Color Projector

Fujieda

Kohmoto

Yunoki

et al. 2019

Symp Digest of Tech Papers

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“…9,10 We have also proposed a backlight for a liquid crystal display 11 and an energy-harvesting LPD. 12,13 For a color display, it is desired to have phosphor materials emitting in three primary colors. In this regard, phosphor materials pumped by light emitting diodes (LEDs) are actively investigated for backlight applications.…”

Section: Introductionmentioning

confidence: 99%

Angle-resolved photoluminescence spectrum of a uniform phosphor layer

Fujieda

Ohta

2017

AIP Advances

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A photoluminescence spectrum depends on an emission angle due to self-absorption in a phosphor material. Assuming isotropic initial emission and Lambert-Beer’s law, we have derived simple expressions for the angle-resolved spectra emerging from the top and bottom surfaces of a uniform phosphor layer. The transmittance of an excitation light through the phosphor layer can be regarded as a design parameter. For a strongly-absorbing phosphor layer, the forward flux is less intense and more red-shifted than the backward flux. The red-shift is enhanced as the emission direction deviates away from the plane normal. When we increase the transmittance, the backward flux decreases monotonically. The forward flux peaks at a certain transmittance value. The two fluxes become similar to each other for a weakly-absorbing phosphor layer. We have observed these behaviors in experiment. In a practical application, self-absorption decreases the efficiency of conversion and results in angle-dependent variations in chromaticity coordinates. A patterned phosphor layer with a secondary optical element such as a remote reflector alleviates these problems.

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