Multilayer Polarizers: A Review of the Claims

Clear, Robert; Mistrick, Richard G.

doi:10.1080/00994480.1996.10748149

Cited by 11 publications

(7 citation statements)

References 6 publications

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“…Daylight is more intense than any interior lighting (offices and schools are designed to provide 200-500 lumens/m 2 [lux, lx] incident on a desk surface; outside, daylight is on the order of 50,000-100,000 lx. Daylight also is polarised; polarisation for interior lighting requires a special filter, and is a separate issue (see Clear and Mistrick 1996, for a review of the literature on polarisation and visibility).…”

Section: Explanatory Mechanismsmentioning

confidence: 99%

A critical examination of perceptual and cognitive effects attributed to full-spectrum fluorescent lighting

Veitch¹,

McColl

2001

Ergonomics

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/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://dx.doi.org/10.1080/00140130010002008Ergonomics, 44, 3, pp. 255-279, 2001-02-01 A Critical examination of perceptual and cognitive effects attributed to full-spectrum fluorescent lightingA Critical examination of perceptual and cognitive effects attributed to full-spectrum fluorescent lighting Veitch, J. A.; McColl, S. L.A version of this paper is published in / Une version de ce document se trouve dans : Ergonomics, v. 44, no. 3, Feb. 2001, pp. 255-279 www.nrc.ca/irc/ircpubs NRCC-42840Veitch AbstractFull-spectrum fluorescent lighting has been credited with causing dramatic improvements in vision, perception, and cognitive performance, as compared to other fluorescent lamp types. These effects are hypothesised to occur because of similarity between FSFL emissions and daylight, which is said to have evolutionary superiority over other light sources. This review, covering the period 1945-1998, critically considers the evidence for these claims. In general, poor-quality research has resulted in an absence of simple deterministic effects that can be confidently attributed to fluorescent lamp type. Promising avenues for lighting-behaviour research include investigations of cognitive mediators of lighting-behaviour relationships, and flicker rates and colour rendering effects on visual processing, appearance judgements, and affect. Good lighting solutions are more complex than lamp type specification.

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Section: Explanatory Mechanismsmentioning

confidence: 99%

A critical examination of perceptual and cognitive effects attributed to full-spectrum fluorescent lighting

Veitch¹,

McColl

2001

Ergonomics

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“…Polarized light sources would largely improve the efficiency of most of these applications: from general illumination, with an improved contrast due to reduced glare, 2 which also minimizes eye discomfort and ultimately eye strain, 3 to highefficiency displays which operate through the spatial modulation of polarized light 4 (for completeness, we also note that polarized light and other forms of artificial light could be harmful for the life of animals and other species relying on natural light cycles to live 5 ). However, common light sources are usually unpolarized, since the electric field of the light emitted has no preferred orientation.…”

Section: Introductionmentioning

confidence: 99%

High-brightness polarized light-emitting diodes

et al. 2012

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Light-emitting diodes are becoming the alternative for future general lighting applications, with huge energy savings compared to conventional light sources owing to their high efficiency and reliability. Polarized light sources would largely enhance the efficiency in a number of applications, such as in liquid-crystal displays, and also greatly improve contrast in general illumination due to the reduction in indirect glare. Here, we demonstrate light-emitting diodes presenting high-brightness polarized light emission by combining the polarization-preserving and directional extraction properties of embedded photonic-crystals applied to non-polar gallium nitride. A directional enhancement of up to 1.8-fold was observed in the total polarized light emission together with a high polarization degree of 88.7% at 465 nm. We discuss the mechanisms of polarized light emission in non-polar gallium nitride and the photonic-crystal design rules to further increase the light-emitting diode brightness. This work could open the way to polarized white-light emitters through their association with polarization-preserving down-converting phosphors. INTRODUCTIONDue to a continuously improved performance, light-emitting diodes (LEDs) are not only the major contender for future general lighting sources, 1 but also play an important role in a growing number of other applications-from backlight for high-efficiency televisions and mobile phone displays, to car lights and headlights-replacing the classical white sources owing to their high efficiency, brightness, reliability and low operation cost. Polarized light sources would largely improve the efficiency of most of these applications: from general illumination, with an improved contrast due to reduced glare, 2 which also minimizes eye discomfort and ultimately eye strain, 3 to highefficiency displays which operate through the spatial modulation of polarized light 4 (for completeness, we also note that polarized light and other forms of artificial light could be harmful for the life of animals and other species relying on natural light cycles to live 5 ). However, common light sources are usually unpolarized, since the electric field of the light emitted has no preferred orientation. This is also the case for most of the nitride-based LEDs commercialized nowadays. A strongly linearly polarized source, however, is obtained in m-plane GaN LEDs where the asymmetric in-plane biaxial stress on the quantum wells (QWs) orients the light emitting dipoles preferentially along the in-plane a direction. Non-polar m-plane GaN LEDs were first developed and more intensively investigated due to the possible reduction of polarization-induced electric fields in the QWs, which for c-plane GaN LEDs degrade their radiative recombination rate as a result of quantum confined stark effects. 6,7 Today, the

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“…GaN‐based LEDs also exhibit many advantages such as control of color temperature and far field emission as well as linearly polarized emission . Among them, the polarized light emission has attracted interest due to its various applications such as back light unit for liquid crystal display, high‐contrast imaging, and improving the performance of laser diodes . It has been theoretically or experimentally reported that GaN semiconductor under anisotropic in‐plane strain exhibited modified valence band structures and resultant polarized optical properties .…”

Section: Introductionmentioning

confidence: 99%

Temperature‐Dependent Polarized Photoluminescence from c‐plane InGaN/GaN Multiple Quantum Wells Grown on Stripe‐Shaped Cavity‐Engineered Sapphire Substrate

Kim

Park

Ahn

et al. 2019

Physica Status Solidi (b)

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Temperature‐dependent polarized photoluminescence from anisotropically strained c‐plane InGaN/GaN multiple quantum wells on stripe‐shaped cavity‐engineered sapphire substrate is theoretically and experimentally investigated. Polarization ratios decrease from 0.98 to 0.74, and emission peak shifts increase from 0 to 50.9 meV with increasing temperature from 10 to 300 K, respectively. Theoretical calculations based on k·p perturbation theory reveal that the temperature dependence of polarized optical behaviors is attributed to the modified valence band structures and hole distributions in each subband. Theoretical results are in good agreement with the experimental results over temperature range from 10 to 300 K, providing in‐depth understanding for the strain‐induced valence band modification of III‐nitride semiconductors.

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Multilayer Polarizers: A Review of the Claims

Cited by 11 publications

References 6 publications

A critical examination of perceptual and cognitive effects attributed to full-spectrum fluorescent lighting

A critical examination of perceptual and cognitive effects attributed to full-spectrum fluorescent lighting

High-brightness polarized light-emitting diodes

Temperature‐Dependent Polarized Photoluminescence from c‐plane InGaN/GaN Multiple Quantum Wells Grown on Stripe‐Shaped Cavity‐Engineered Sapphire Substrate

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