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Proceedings Paper

Phosphor concentration and geometry for high power white light emitting diode
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Paper Abstract

The most common method of making white light emitting diode (LED) is to mix the blue light from the LED die and the wavelength converted yellow light from the phosphor layer. The color conversion efficiency depends on the geometry and concentration of the phosphor layer including phosphor material. Thus the optimization of the phosphor geometry and concentration make increase the luminous efficiency of the white LED. In this paper, the remote phosphor scheme is optimized focusing on increasing the luminous efficiency in high power. The phosphor layer is separated by the silicone resin from the LED die. The silicone resin covers the LED die with dome shape to increase the extraction efficiency. The phosphor layer has very large volume with dilute concentration. The separation of phosphor layer from LED die and very large volumetric dilute phosphor layer were great important role in increasing the luminous flux. The improved luminous flux was 15% for 1mm2 LED die at 700mA.

Paper Details

Date Published: 11 February 2010
PDF: 8 pages
Proc. SPIE 7617, Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XIV, 76171Y (11 February 2010); doi: 10.1117/12.851535
Show Author Affiliations
Kyung-Mi Moon, Samsung LED (Korea, Republic of)
Se-Hwan An, Samsung LED (Korea, Republic of)
Hyung-Kun Kim, Samsung LED (Korea, Republic of)
Jung-Hye Chae, Samsung LED (Korea, Republic of)
Yong-Jo Park, Samsung LED (Korea, Republic of)

Published in SPIE Proceedings Vol. 7617:
Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XIV
Klaus P. Streubel; Heonsu Jeon; Li-Wei Tu; Norbert Linder, Editor(s)

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