Precise optical model of multi-chip white LEDs

Chien, Wei Ting; Sun, Ching Cherng; Moreno, Iván

doi:10.1364/oe.15.007572

Cited by 89 publications

(52 citation statements)

References 9 publications

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“…5) [14,15]. Quartz has excellent thermal and chemical stability and is easily available, and was thus used for this study [16].…”

Section: Sio2 Particle Scatteringmentioning

confidence: 99%

Color and Illuminance Uniformity Enhancement of Multi-chip White LEDs by Complementing Silica Particles

Tin¹,

Minh

Nhân³

et al. 2017

AUSMT

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Abstract:We analyze the influence of silica particle (SiO2) concentrations on color and illuminance uniformity of multichip white LEDs (MCW-LEDs) with a correlated color temperature (CCT) near 7700 K. It is suggested that the novel phosphor silicone layer (PSL), which added silica particles, can improve CCT and illumination uniformity. Using the commercial simulation program LightTools, based on Monte Carlo method, the novel PSL demonstrated a reduction of the CCT deviation (DCCT) to 1719 K from 2211 K, while the illuminance uniformity increased from 0.328 to 0.353. The simulation results could be totally convinced by Mie theory. This results point towards an approach for manufacturing high-quality MCW-LEDs.

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“…5) [14,15]. Quartz has excellent thermal and chemical stability and is easily available, and was thus used for this study [16].…”

Section: Sio2 Particle Scatteringmentioning

confidence: 99%

Color and Illuminance Uniformity Enhancement of Multi-chip White LEDs by Complementing Silica Particles

Tin¹,

Minh

Nhân³

et al. 2017

AUSMT

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“…In recent years, C. C. Sun considered the importance of the midfield region, which is between the near-field and far-field regions; in this region, the propagation of light varies with distance, normally within 1 cm to 1 m. 11,12 This case applies in RICE because the distance from the LED to the image plane is only a few centimeters. Experiments were carried out to verify the accuracy of the simulation.…”

Section: Definition Of Uniformity Of Light In Ricementioning

confidence: 99%

Improving the uniformity of luminous system in radial imaging capsule endoscope system

Ou-Yang

Jeng

2013

Opt. Eng

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Abstract. This study concerns the illumination system in a radial imaging capsule endoscope (RICE). Uniformly illuminating the object is difficult because the intensity of the light from the light emitting diodes (LEDs) varies with angular displacement. When light is emitted from the surface of the LED, it first encounters the cone mirror, from which it is reflected, before directly passing through the lenses and complementary metal oxide semiconductor (CMOS) sensor. The light that is strongly reflected from the transparent view window (TVW) propagates again to the cone mirror, to be reflected and to pass through the lenses and CMOS sensor. The above two phenomena cause overblooming on the image plane. Overblooming causes nonuniform illumination on the image plane and consequently reduced image quality. In this work, optical design software was utilized to construct a photometric model for the optimal design of the LED illumination system. Based on the original RICE model, this paper proposes an optimal design to improve the uniformity of the illumination. The illumination uniformity in the RICE is increased from its original value of 0.128 to 0.69, greatly improving light uniformity. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 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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“…Meanwhile, the converted yellow light is intensified through each scattering. Correspondingly, the difference of light intensity distributions can cause a yellow ring phenomenon [3]. To enhance light quality and lumen output, the multiple phosphors or the optical structures of white LED lamps could be optimized.…”

Section: Introductionmentioning

confidence: 99%

Using Green Emitting Phosphor for Improving Lighting Performance of In-cup Package White LED Lamps

Nhân¹,

Minh²,

Anh³

2017

IJPEDS

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LED technology had a huge development in recent years with major benefits: long-life, high-efficiency, excellent performance, compactness. In this work, an innovative method for improving the performance of multi-chip white LED lamps (MCW-LEDs) by adding the green Ce 0.67 Tb 0.33 MgAl 11 O 19 :Ce,Tb (CeTb) phosphor to their in-cup phosphor compounding is proposed, investigated and demonstrated. Firstly, CeTb was mixed to the incup phosphor package of MCW-LEDs. Then by varying CeTb concentration, lumen output and angular color uniformity (ACU) of MCW-LEDs was calculated and analyzed. The results showed that the lumen output and the ACU of 7000 K and 8500 K MCW-LEDs increased significantly in comparison with others related works. This method is a prospective ideal for future improving LED manufacture.

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Precise optical model of multi-chip white LEDs

Cited by 89 publications

References 9 publications

Color and Illuminance Uniformity Enhancement of Multi-chip White LEDs by Complementing Silica Particles

Color and Illuminance Uniformity Enhancement of Multi-chip White LEDs by Complementing Silica Particles

Improving the uniformity of luminous system in radial imaging capsule endoscope system

Using Green Emitting Phosphor for Improving Lighting Performance of In-cup Package White LED Lamps

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