Realizing LED illumination lighting applications

Nguyen, Francis; Terao, Brian; Laski, J.

doi:10.1117/12.623393

Cited by 16 publications

(10 citation statements)

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“…However, more than half of the light re-emitted from the phosphor transfers backward to the absorptive LED chip, the configuration of conventional pcLED would get a low luminous efficiency [3], [4]. Remote-phosphor LEDs with phosphor layer away from the chip have been demonstrated in previous studies to improve the luminous efficiency of pcLEDs [5]- [13].…”

Section: Inverted-cone-lens Encapsulant With Gradientmentioning

confidence: 98%

“…Being the most popular packaging structure for white LEDs, the pcLEDs is based on mixing the blue light from the LED chip and the excited emission from a phosphor material [1]- [4]. However, more than half of the light re-emitted from the phosphor transfers backward to the absorptive LED chip, the configuration of conventional pcLED would get a low luminous efficiency [3], [4].…”

Section: Inverted-cone-lens Encapsulant With Gradientmentioning

confidence: 99%

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Inverted-Cone-Lens Encapsulant With Gradient Surface for Ring-Remote-Phosphor Structure

Lin¹,

Ying²,

Lin³

et al. 2014

IEEE Trans. Device Mater. Relib.

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The ordinary ring-remote-phosphor structure consisting of an inverted-cone-lens encapsulant and a surrounding ring-remote-phosphor layer reduces the probability of the backward light from the phosphor layer to the absorptive lightemitting diode (LED) chip and then increases the package extraction efficiency. However, some of the blue light emitting from the LED chip impinges on the inverted-cone-lens surface and then escapes without hitting the ring-remote-phosphor layer. The blue light leakage from the inverted-cone-lens surface is a serious problem for the ring-remote-phosphor structure devices in use, because it will lower the actual illumination effects and result in discomfort for the eyes. In this paper, we discuss the predominant factors of the blue light leakage from the inverted-cone-lens surface and propose an improve ring-remote-phosphor structure that utilizes an inverted-cone-lens encapsulant with gradient surface to decrease the blue light leakage. Ray-tracing simulations are performed to analyze the blue light leakages from the ordinary and improved inverted-cone-lens encapsulants in the ring-remotephosphor structures. The simulation results show that the improved inverted-cone-lens encapsulants get almost no blue light leakage from the inverted-cone-lens surface directly and then lessen the discomfort for the eyes. Our results further demonstrate that the improved ring-remote-phosphor structure device will have higher angular color uniformity than the ordinary one.Index Terms-Blue light leakage, inverted-cone-lens encapsulant with gradient surface, phosphor-converted white lightemitting diodes (LEDs), ring-remote-phosphor structure.

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Section: Inverted-cone-lens Encapsulant With Gradientmentioning

confidence: 98%

Section: Inverted-cone-lens Encapsulant With Gradientmentioning

confidence: 99%

Inverted-Cone-Lens Encapsulant With Gradient Surface for Ring-Remote-Phosphor Structure

Lin¹,

Ying²,

Lin³

et al. 2014

IEEE Trans. Device Mater. Relib.

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“…Light-emitting diodes (LEDs) have been extensively applied in general lighting and special lighting in various fields owing to several advantages, including high efficiency, long life, vivid colors, fast response, and others [1][2][3][4][5][6]. The reported high packaging efficiency [7,8] makes LEDs useful as a light source for many new applications [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Optical design of dental light with high performance and low power based on white LEDs

Sun

Cai

et al. 2015

Appl. Opt.

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This paper presents an optical design of a dental light that meets the regulation of ISO 9680. The designed light pattern on the target is an elliptical shape with uniform illumination. Moreover, the real module contains four optical modules, and is operated at 9 W and performs a maximum illuminance of 42,010 lx. In order to reduce the correlated color temperature (CCT) variation, we replace the original white light-emitting diode with a new one, which has an extremely low angular CCT derivation. Accordingly, the CCT variation is reduced to 232 K from 1323 K of the original module.

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“…[1][2] The current study issue includes the enhancement of light efficiency, brightness and lighting design so that LEDs may replace most light sources in current lighting unit or device. Serving as a long-life solid-state lighting source, LEDs have been proposed to replace the light sources in some special applications, including automotive forward lighting and other projection devices.…”

Section: Introductionmentioning

confidence: 99%

Optical modeling for LED in mid-field region

Sun

Lee

et al. 2007

SPIE Proceedings

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In this paper, we propose a novel LED modeling algorithm for precise 3-D light pattern simulation. Normalized cross correlation is proposed to to verify the validity of the simulation in 1-D intensity pattern as well as 2-D irradiance pattern in various mid-field distances. The model is demonstrated to obtain more than 98% in normalized cross correlation between the simulation light pattern and experimental measurement for a TIP LED emitter by Lumileds.

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Realizing LED illumination lighting applications

Cited by 16 publications

References 0 publications

Inverted-Cone-Lens Encapsulant With Gradient Surface for Ring-Remote-Phosphor Structure

Inverted-Cone-Lens Encapsulant With Gradient Surface for Ring-Remote-Phosphor Structure

Optical design of dental light with high performance and low power based on white LEDs

Optical modeling for LED in mid-field region

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