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Proceedings Paper

Light conversion in opto semiconductor devices: from the development of luminous materials to products with customized colors
Author(s): B. Braune; H. Brunner; J. Strauss; K. Petersen
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Paper Abstract

LEDs using light conversion have gained importance for a variety of applications. As an example, white conversion LEDs were introduced by Osram OS in 1998 as dashboard illumination devices. Since then they have evolved into a powerful light source for projection and lighting applications. Today the quality of white LED light can be adjusted from a cool bluish white to a warm white with very good color rendering. Combining several wavelengths emitted by both chips and phosphors makes a variety of LED colors accessible. The concept of realizing any customized color by light conversion is called "Color on Demand" (COD). Another advantage for certain colors is, that the conversion LED can be more efficient than the purely chip based solution. In particular conversion LEDs with a dominant wavelength of 563 nm can be offered due to the strong converter R&D platform of Osram. The efficiencies of these LEDs, which consist of a blue emitting chip and a green emitting nitride phosphor, are 10 times higher than the ones of the corresponding InGaAlP-based solution. All COD LEDs have proven an excellent stability even in accelerated life time tests and thus are suitable for automotive applications.

Paper Details

Date Published: 25 October 2005
PDF: 8 pages
Proc. SPIE 6013, Optoelectronic Devices: Physics, Fabrication, and Application II, 60130D (25 October 2005); doi: 10.1117/12.633174
Show Author Affiliations
B. Braune, Osram Opto Semiconductors (Germany)
H. Brunner, Osram Opto Semiconductors (Germany)
J. Strauss, Osram Opto Semiconductors (Germany)
K. Petersen, Osram Opto Semiconductors (Germany)


Published in SPIE Proceedings Vol. 6013:
Optoelectronic Devices: Physics, Fabrication, and Application II
Joachim Piprek, Editor(s)

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