Illumination device with at least one led as the light source
AssigneesPatent-Treuhand-Gesellschaft fur elektrische Gluhlampen mbH, OSRAM Opto Semiconductors GmbH
InventorsDieter Bokor, Andries Ellens, Günter Huber, Frank Jermann, Manfred Kobusch, Michael Ostertag, Wolfgang Rossner, Franz Zwaschka
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Abstract
The invention relates to a luminescence conversion led based illumination deice that emits primarily radiation in the range of from 370 and 430 nm of the optical spectrum (peak wavelength). Said radiation is converted to radiation having a longer wavelength using three luminescent substances that emit in the red, green and blue range.
Claims7
An illumination device with at least one LED as the light source, the LED emitting primary radiation in the range from 370 to 390 nm of the optical spectral region (peak wavelength), this radiation being partially or completely converted into radiation of a longer wavelength by three phosphors which are exposed to the primary radiation from the LED and which emit in the blue, green and red spectral regions, so that white light is formed, characterized in that the conversion is achieved at least with the aid of a phosphor which emits blue light with a wavelength maximum at 440 to 485 nm, and with the aid of a phosphor which emits green light with a wavelength maximum at 505 to 550 nm, and with the aid of a phosphor which emits red light with a wavelength maximum at 560 to 670 nm, and wherein the white light is generated using a green phosphor Ba0.82Al12O18.82:(Eu2+, Mn2+).
An illumination device with at least one LED as the light source, the LED emitting primary radiation in the range from 370 to 400 nm of the optical spectral region (peak wavelength), this radiation being partially or completely converted into radiation of a longer wavelength by three phosphors which are exposed to the primary radiation from the LED and which emit in the blue, green and red spectral regions, so that white light is formed, characterized in that the conversion is achieved at least with the aid of a phosphor which emits blue light with a wavelength maximum at 440 to 485 nm, and with the aid of a phosphor which emits green light with a wavelength maximum at 505 to 550 nm, and with the aid of a phosphor which emits red light with a wavelength maximum at 560 to 670 nm, and wherein the white light is generated using a red phosphor M3Mg Si2O8:(Eu2+, Mn2+) where M=at least one of the metals Ba, Ca, Sr.
Dependencies are inferred from the claim text.