Freeform microstructure linear light emitter design for a natural light illumination system

Chen, Bojian; Gao, Bo-Yuan; Ullah, Irfan; Chen, Kuan‐Yu; Chou, Cheng-Fu; Lin, Chia‐Jung; Chang, Che‐Chen; Jhan, Kai-Cyuan; Whang, Allen Jong-Woei

doi:10.1364/ao.54.00e159

Cited by 4 publications

(2 citation statements)

References 15 publications

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“…For those drawbacks, another white LED package comprised of the two different LED chips and two phosphors has been proposed to achieve high CRI and luminous output as well as be able to keep a tunable color. In this article, we suggest a color structure that is designed based on Beer's law and linear conversion for the demand of producing white LEDs with subtle color difference [17][18][19][20][21]. In addition, this W-LED module was manufactured by applying yttrium aluminum garnet (YAG) and nitride-based phosphors in blue and red LEDs with high CRI and luminous efficiency.…”

Section: Introductionmentioning

confidence: 99%

Enhancing the CRI and lumen output for the 6600 K WLED with convex-dual-layer remote phosphor geometry by applying red-emitting MGSR3SI2O8:EU2+,MN2+ phosphor

Bui¹,

Loan²,

Le³

et al. 2020

IJECE

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The traditional white LED product established with a single chip and a single phosphor results in a low color rendering index (CRI). The upgrade of LED package is comprised of two chips and one phosphor material and gives the higher CRI while keeping high luminous efficiency. Based on previous findings, the research paper performs the application of the two chips and two phosphors to enhance the color tunability of LEDs with different amounts and intensities of the two employed phosphors. Additionally, a color design model is built to serve the purpose of bettering the color fine-tuning of the white-light LED module. The maximum value of the difference between the measured CIE 1931 color coordinates and that of the simulated model is approximately 0.0063 around the 6600 K correlated color temperature (CCT). From the results, this study offers a quick approach to achieve the color fine tuning of a white-light LED module with a high CRI and luminous efficiency.

show abstract

Section: Introductionmentioning

confidence: 99%

Enhancing the CRI and lumen output for the 6600 K WLED with convex-dual-layer remote phosphor geometry by applying red-emitting MGSR3SI2O8:EU2+,MN2+ phosphor

Bui¹,

Loan²,

Le³

et al. 2020

IJECE

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“…This research presents the optical raytracing simulation of the proposed daylighting design using LightTools ® optical-simulation tools [27][28][29][30]. Mechanical and optical components are designed, analysed, and verified.…”

Section: Introductionmentioning

confidence: 99%

Heliostats Daylighting System for Multi-floor Buildings

Ullah

2019

Journal of Daylighting

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Daylighting has been considered as a major part of sustainable buildings for saving electric lighting and providing benefits such as, health, visual comfort, and productivity of the occupants. A daylighting system enables the sunlight to capture and deliver it in the interior spaces that cannot be illuminated through windows. Previously, small-scale daylighting systems have been presented using active and passive techniques. This paper presents a daylighting scheme to illuminate the interior of a multi-floor building. Traditional light pipe-based systems are lacked to achieve a high concentration of sunlight for illuminating the interior of a multi-floor building. Here, a highly concentrated light pipe-based daylighting system is presented using heliostats. The daylighting system includes heliostats, light pipe, and light guide to collect, transmit, and distribute the light in the interior of the multi-floor building, respectively. The light guide is made of a reflective film and a prismatic optical film for distributing the light in the interior. Heliostats track the sun and reflect the light towards a circular flat mirror, which inserts the light into the light pipe. To transmit a portion of the light into the light guide for illuminating the interior of each floor, a redirecting mirror is placed at the inlet of the light guide inside the light pipe. Simulation results have shown that an efficiency of 40% is achieved providing almost uniform illumination in the interior.

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Active chromatically consistent hybrid light illumination system with natural light and light emitting diode for indoor lighting

Hao

Tao

et al. 2019

Energy and Buildings

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Freeform microstructure linear light emitter design for a natural light illumination system

Cited by 4 publications

References 15 publications

Enhancing the CRI and lumen output for the 6600 K WLED with convex-dual-layer remote phosphor geometry by applying red-emitting MGSR3SI2O8:EU2+,MN2+ phosphor

Enhancing the CRI and lumen output for the 6600 K WLED with convex-dual-layer remote phosphor geometry by applying red-emitting MGSR3SI2O8:EU2+,MN2+ phosphor

Heliostats Daylighting System for Multi-floor Buildings

Active chromatically consistent hybrid light illumination system with natural light and light emitting diode for indoor lighting

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