Patent ID: 8113675
Filing Date: 2012-02-14
Classification: H01L

Abstract:
1. An arrangement for emitting mixed light comprising primary and secondary radiation in a mean direction of emission, comprising at least one first electroluminescent light-source for emitting first primary radiation having a maximum intensity at a first wavelength, at least one second electroluminescent light-source for emitting second primary radiation having a maximum intensity at a second wavelength greater than the first wavelength, and a light-converting element for absorbing at least one of the primary radiations and re-emitting the secondary radiation, which light-converting element is so arranged that the entire proportion of primary radiation in the mixed light has passed through the light-converting element, and wherein the light-converting element comprises a ceramic light-converting material whose microstructure is selected to be such that the color point of the mixed light comprising primary and secondary radiation is substantially independent of the angle of viewing (B), said ceramic light-converting material having a plurality of oxidic particles having a mean diameter of between about 200 nm to about 1000 nm, said ceramic light-converting material further having a plurality of pores having a mean diameter of between about 700 nm to about 1200 nm, said angle of viewing (B) creating a first color point and a second color point over said angle of viewing (B), wherein said first color point and said second color point has a variation in color of less than 0.02 of said angle.