Light emitting apparatus
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United States of America Patent
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N/A
Issued Date -
Jul 15, 2004
app pub date -
Oct 31, 2003
filing date -
May 2, 2001
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
According to the present invention, first, a white LED with high color rendering property is realized. In addition, a general object of the present invention is to provide a highly practical light emitting device wherein a rare earth complex is utilized as a wavelength conversion light emitting device of a high efficiency. Such an object is achieved by providing a combined light emitting device wherein a specific complex having a rare earth ion, particularly an Eu (europium) ion, as the central ion, is borne by a transparent solid matrix such as polymer or plastic, and this rare earth complex is excited by an InGaN based blue light emitting diode or by a semiconductor laser utilizing a light emitting layer of InGaN based material. A combination of such a blue light emitting diode, a YAG yellow fluorescent material and such an Eu complex for red light allows for the formation of a white light source with high color rendering property. In addition, a combination of such a semiconductor laser and a plastic containing such a rare earth complex can be widely utilized for automobile parts and the like, as an illuminant which is compact and light in weight and has a long life.
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