Energy-harvesting laser phosphor display and its design considerations

Fujieda, Ichiro; Itaya, Shunsuke; Ohta, Masamichi; Hirai, Yukihiko; Kohmoto, Takamasa

doi:10.1117/1.jpe.7.028001

Cited by 15 publications

(8 citation statements)

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“…The maximum number for the summation in Eqs. (10) and (11) is increased to 50 although 10 is justified for convergence for the same input parameter set. 27…”

Section: Modelmentioning

confidence: 99%

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

Fujieda

2020

J. Photon. Energy

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When a single spot in a planar luminescent waveguide is excited, some photoluminescence photons that are trapped inside reach its edge. Considering the photon losses due to leakage from its top and bottom surfaces and self-absorption during wave-guiding, the probability of collecting photons at its edge is expressed as a function of the coordinates of the excited spot for polygonal and curved waveguides. The emission is assumed to be isotropic, and scattering and re-emission events are neglected for simplicity. This model might be useful for predicting the performance of luminescent waveguides with various shapes under non-uniform illumination. © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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“…The maximum number for the summation in Eqs. (10) and (11) is increased to 50 although 10 is justified for convergence for the same input parameter set. 27…”

Section: Modelmentioning

confidence: 99%

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

Fujieda

2020

J. Photon. Energy

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“…We displayed alphabet characters by exciting appropriate regions of the phosphor stripes with a patterned blue laser beam. For this purpose, we used a modified commercial projector based on the digital micromirror device (DMD) technology and a blue laser diode unit emitting at 410nm [4]. For measuring the electric power, we connected an ammeter, a variable resistor and a voltmeter to the solar cells as shown in Fig.…”

Section: Image Projection and Energy Harvestingmentioning

confidence: 99%

“…Solar cells are attached to the edge surfaces of this fluorescent waveguide (FWG). We have shown that high-resolution gray-scale images are displayed by projecting intensity-modulated excitation light on an FWG and that a photodiode attached to its edge recovered a fraction of the optical power incident of its surface [4].…”

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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“…[2][3][4] Using an LSC as its screen, one can display an image while recovering a part of the laser power. 5 When the light source is turned off, the screen can generate power by harvesting ambient light. This energy-harvesting display might be incorporated in a wall, a window, and a billboard.…”

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confidence: 99%

Edge collection function: an analytical expression for the optical efficiency of an energy-harvesting device based on photoluminescence

2019

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An edge collection function is proposed for characterizing the optical efficiency of an energy-harvesting system that utilizes photoluminescence (PL) in a waveguide. We assume that a single spot in a waveguide is excited and that PL is isotropic. For the photons to be collected by one edge of the waveguide, they must be emitted toward the edge, trapped in the waveguide and they must survive self-absorption on the way. The optical efficiency is formulated as the product of these probabilities. When this function is calculated for every spot on the waveguide and for each wavelength of the PL spectrum, the efficiency of the system is given by superposition. Its validity is checked by a Monte Carlo simulation for the case of no self-absorption loss. In experiment, we fabricate a 5-cm 2 waveguide with a thin layer of Lumogen F Red 305 and measure its efficiency by placing a photodiode array in the vicinity of its edge with a small air gap. The formula roughly reproduces the efficiency and its dependency on the position of the excitation spot. This analytical approach allows one to estimate the optical efficiency for an arbitrary incident light distribution with small computational complexity. © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Energy-harvesting laser phosphor display and its design considerations

Cited by 15 publications

References 0 publications

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

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

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

Edge collection function: an analytical expression for the optical efficiency of an energy-harvesting device based on photoluminescence

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