LED based light source for improved color saturation

Abstract

There is provided a light emitting device comprising a light source comprising at least one light emitting diode emitting visible radiation. The light emitting device further comprises a wavelength converting body comprising a first wavelength converting material, which is arranged to receive light emitted by said light source and which has an emission maximum in the range of from 600 to 700 nm. The first wavelength converting material comprises the elements Mg, Ge, O and Mn. A light emitting device according to the invention produces light having increased saturation of red colors. Moreover, long life and good color stability is achieved.

Description

technical field [0001] The invention relates to a light emitting device comprising a light emitting diode based light source and a wavelength converting body comprising a wavelength converting material arranged to receive light emitted by said light source. Background technique [0002] In many situations, such as retail or marketplaces, it is desirable to display items such as fresh food in an attractive manner. In terms of lighting, this usually means that the color of the item should be enhanced, that is, the item should show more color saturation. [0003] For this purpose, compact high-intensity gas-discharge lamps such as ultra-high pressure sodium lamps (eg SDW-T lamps) or special fluorescent lamps are currently used as a rule. In the case of ultra-high pressure sodium lamps, an additional filter is usually used to obtain the desired saturation, but this results in low system efficiency. In addition, ultra-high pressure sodium lamps have a relatively short lifetime ...

AI Technical Summary

Problems solved by technology

However, for specialty lighting applications, a disadvantage of many blue light converting phosphors is that they typically exhibit a broad emission spectrum and thus cannot achieve high color saturation

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