Concentric re-emission pattern from a planar waveguide with a thin uniform luminescent layer

Matsumura, Ryo; Fujieda, Ichiro

doi:10.1364/ao.384323

Cited by 4 publications

(5 citation statements)

References 20 publications

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“…However, the measured intensity of the re-emitted PL photons from a planar waveguide is at least four orders of magnitude smaller than the original emission. 16 It is likely that the phenomenon of self-absorption in the luminescent layer masks the potential gain brought by the light-diffusing film in the shorter wavelength range for each color.…”

Section: Measurementmentioning

confidence: 99%

Front lighting for an energy-harvesting luminous-reflective display and its design considerations

2022

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The color gamut of a luminous-reflective display (LRD) shrinks when the incident light lacks blue photons. A frontlight unit (FLU) emitting in blue can prevent this and ensure readability in the dark. A one-dimensional model was developed to express spectral fluxes emerging from the subpixels in an energy-harvesting LRD (EH-LRD) in terms of its design parameters and the ambient lighting condition. In the experiment, a luminescent layer stacked on an infrared pass filter was excited by monochromatic light from an edge-lit FLU at 405 nm in the dark. The model roughly reproduced the relative peak intensities measured with the three materials (BBOT, Coumarin 6, and Lumogen F Red 305). It quantifies the trade-off between the two objectives of an EH-LRD: displaying images and harvesting energy. Hence, the model might be used to set goals for future developments of materials and components. © The Authors.Published by SPIE under a Creative Commons Attribution 4.0 International 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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Section: Measurementmentioning

confidence: 99%

Front lighting for an energy-harvesting luminous-reflective display and its design considerations

2022

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“…This is reproduced by a model based on self-absorption and subsequent re-emission of PL photons inside the waveguide. 27 We extend this model to formulate optical efficiency of a planar LWG in cylindrical geometry. Some numerical examples are given.…”

Section: Optical Efficiency In Cylindrical Geometrymentioning

confidence: 99%

“…Furthermore, we neglect re-emission events based on our previous experiment. 27 A detailed argument behind this assumption is provided in the Appendix.…”

Section: Modelmentioning

confidence: 99%

“…(10) and (11) is increased to 50 although 10 is justified for convergence for the same input parameter set. 27…”

Section: Modelmentioning

confidence: 99%

“…This behavior of I abs is the origin of the concentric re-emission pattern. 27 It is worth noting that I esc and I abs are complimentary in a sense that more leakage from the waveguide at a certain radius means less absorption there. This comes from the factors R F and 1 − R F in Eqs.…”

Section: Numerical Examplementioning

confidence: 99%

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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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Spectral study on utilizing ambient light with luminescent materials for display applications

Fujieda

Matsuda

2021

Opt. Express

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A luminous reflective display can be constructed by placing an electro-optic shutter on the stack of a luminescent layer, a color filter, and a reflector in this order. The luminescent materials convert a part of the incident light to photoluminescence photons. The reflector redirects the downward photon flux toward an observer. The color filters prevent the photons with unwanted wavelengths from being reflected. The upward spectral flux from this multi-layer structure is formulated. Experiments with off-the-shelf components revealed more than three-fold increase in spectral flux and up to 55% color gamut extension, compared with a control device without luminescent materials.

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Concentric re-emission pattern from a planar waveguide with a thin uniform luminescent layer

Cited by 4 publications

References 20 publications

Front lighting for an energy-harvesting luminous-reflective display and its design considerations

Front lighting for an energy-harvesting luminous-reflective display and its design considerations

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

Spectral study on utilizing ambient light with luminescent materials for display applications

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