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Light emitting device

A technology of light-emitting devices and light-emitting diodes, applied in optical elements, light guides, optics, etc., can solve the problem of reducing wavelength conversion efficiency, and achieve the effect of high light cycle efficiency and high lumen efficiency

Inactive Publication Date: 2011-09-28
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the wavelength conversion layer of this system runs the risk of overheating due to the heat generated by the wavelength conversion activity, resulting in reduced wavelength conversion efficiency (a phenomenon known as thermal quenching)

Method used

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Embodiment Construction

[0029] As shown in the figures, the dimensions of layers and domains are exaggerated for illustrative purposes, and are thus provided to illustrate the main structures of embodiments of the present invention.

[0030] figure 1 A light emitting device according to one presently preferred embodiment of the present invention is shown. The light emitting device 1 comprises a light source 2 adapted to emit light of at least a first wavelength range. The light emitted by the light source can typically be visible light close to UV light. This first wavelength range is typically from 380nm to 520nm, preferably from 440nm to 480nm, and more preferably from 450nm to 470nm. The light source may comprise at least one LED. LEDs having emission wavelength ranges as described above as well as LEDs having other emission wavelengths are known to those skilled in the art.

[0031] Alternatively, the light source may comprise a plurality of LEDs with different emission characteristics. For ...

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Abstract

The invention relates to a light-emitting device (1) comprising: a light source (2) for emitting light of a first wavelength range; a light guide (3) having a light receiving surface (4) for receiving at least part of said light emitted by the light source (2), a front surface (31) and a rear surface (32), for guiding light of said first wavelength range by total internal reflection at said front surface and said rear surface; a plurality of outcoupling elements (5) for outcoupling light from the light guide such that at least part of the light that is outcoupled by the outcoupling elements exits the light guide through said rear surface; a reflective member (6) arranged in rear of said light guide to reflect light that is outcoupled from the light guide; and a wavelength converting member (8) comprising a wavelength converting material arranged outside the light guide to convert light of said first wavelength range to light of a second wavelength range. Advantageously, in the light-emitting device according to the invention, the color, color temperature and / or color rendering index may be tuned by modifying the wavelength converting member. As a result, white light which is perceived as warm may be obtained.

Description

technical field [0001] The invention relates to a light emitting device comprising: a light source for emitting light in at least a first wavelength range; a light guide; a plurality of outcoupling elements for decoupling light from the light; a reflective member arranged to reflect light from the light derivation coupled light; and a wavelength converting member comprising a wavelength converting material. Background technique [0002] Light emitting diode (LED) based lighting devices are increasingly used in a wide variety of lighting applications. LEDs offer advantages over traditional light sources such as incandescent and fluorescent lamps, including long life, high lumen efficiency, low operating voltage, high purity of spectral color, and rapid modulation of lumen output. One problem with LED lighting, however, is providing "warm" white light. LEDs with high lumen efficiency (-75 lumens / watt) available today produce light with a high color temperature (-6000K) and a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/00
CPCG02B6/0055G02B6/004G02B6/0031G02B6/102
Inventor M·P·C·M·克里金G-E·奥纳克
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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