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Integration of Non-Lambertian LED and Reflective Optical Element as Efficient Street Lamp

Jui-Wen Pan, Sheng-Han Tu, Wen-Shing Sun, Chih-Ming Wang, and Jenq-Yang Chang

Open Access Open Access

Abstract

A cost effictive, high throughput, and high yield method for the increase of street lamp potency was proposed in this paper. We integrated the imprinting technology and the reflective optical element to obtain a street lamp with high illumination efficiency and without glare effect. The imprinting technique can increase the light extraction efficiency and modulate the intensity distribution in the chip level. The non-Lambertian light source was achieved by using imprinting technique. The compact reflective optical element was added to efficiently suppress the emitting light intensity with small emitting angle for the uniform of illumination intensity and excluded the light with high emitting angle for the prevention of glare. Compared to the conventional street lamp, the novel design has 40% enhancement in illumination intensity, the uniform illumination and the glare effect elimination.

©2010 Optical Society of America

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Figures (5)
Fig. 1
Fig. 1 The flow chart of imprinting process (a) The SOG layer spun onto the surface of LED chip (b) The imprinting process in chamber (c) The LED chip just separated from Si mold (d) The LED chip after removing SOG recover the pad area. (not to scale)

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Fig. 2
Fig. 2 The pictures and dimension scheme of imprinting structure (a) the OM top view of imprinting structure (b) the AFM tilt view of imprinting structure (c) the imprinting structure geometric parameters (not to scale)

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Fig. 3
Fig. 3 The electric performance of imprinting and planar LED (a) The applied voltage versus current curve (b) The injection current versus luminous curve (c) The intensity distributions of planar and imprinting LED

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Fig. 4
Fig. 4 The practical application of the imprinting LED chip (a) the side view of designed reflector for street lamp (b) The tilt view of designed reflector for street lamp (c) The far-field pattern of designed street lamp and OSRAM commercial product

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Fig. 5
Fig. 5 The structure and intensity distribution of imprinting LED street lamp(a) The street lamp composed of 6 × 8 LED light source array (b) The intensity distribution on the illuminated surface

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Tables (2)

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Table 1 The street lamp design specifications

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Table 2 Specification comparisons between with designed street lamp and Golden Dragon with ARGUS lens

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