Illumination Device Comprising A Phosphor Arrangement And A Laser

Abstract

A lighting device comprising a phosphor arrangement ( 2 ) having a phosphor region; ( 31 - 33 ), a first laser ( 5 ) for irradiating a part of the phosphor region ( 31 - 33 ) with a first laser radiation; wherein the phosphor region ( 31 - 33 ) comprises at least one phosphor which can be irradiated by the first laser radiation and re-emits said first laser radiation at least partly in a manner wavelength-converted into colored light having a first light color; a second laser ( 6 ) configured for emitting a second laser radiation having a second light color, wherein the second light color of the second laser radiation is identical in color to the first light color of the wavelength-converted colored light; and wherein the lighting device is configured to simultaneously emit the second laser radiation and the wavelength-converted colored light of identical color emitted by the phosphor.

1 . A lighting device comprising:
 a phosphor arrangement having at least one phosphor region;   at least one first laser for irradiating in each case at least one part of the phosphor region with a first laser radiation;   wherein the at least one phosphor region comprises at least one phosphor which can be irradiated by the first laser radiation and re-emits said first laser radiation at least partly in a manner wavelength-converted into colored light having a first light color;   at least one second laser configured for emitting a second laser radiation having a second light color, wherein the second light color of the second laser radiation is identical in color to the first light color of the wavelength-converted colored light; and   wherein the lighting device is configured to simultaneously emit the second laser radiation and the wavelength-converted colored light of identical color emitted by the at least one phosphor.   
     
     
         2 . The lighting device as claimed in  claim 1 , comprising an optical unit, for superimposing the second laser radiation and the wavelength-converted colored light of identical color emitted by the at least one phosphor. 
     
     
         3 . The lighting device as claimed in  claim 2 , wherein the optical unit comprises an optical integrator. 
     
     
         4 . The lighting device as claimed in  claim 3 , wherein the optical integrator is a TIR rod. 
     
     
         5 . The lighting device as claimed in  claim 1 , wherein the spectra of first laser radiation and second laser radiation are different. 
     
     
         6 . The lighting device as claimed in  claim 1 , wherein the laser radiation of the at least one second laser comprises red laser radiation. 
     
     
         7 . The lighting device as claimed in  claim 1 , wherein the laser radiation of the at least one first laser comprises blue laser radiation and/or blue-violet and/or ultraviolet laser radiation. 
     
     
         8 . The lighting device as claimed in  claim 1 , wherein the phosphor arrangement is embodied as a rotatable phosphor wheel. 
     
     
         9 . The lighting device as claimed in  claim 1 , wherein the lighting device comprises at least one reflector disposed optically downstream of the phosphor wheel, and a light emission area of the phosphor region that is generated by the laser radiation is situated in or at a focal point of the at least one reflector. 
     
     
         10 . The lighting device as claimed in  claim 9 , wherein the optical unit comprises an optical integrator, and, wherein the reflector is elliptically shaped, and the optical integrator is situated in or at the second focal point of the at least one elliptical reflector. 
     
     
         11 . The lighting device as claimed in  claim 1 , wherein the phosphor arrangement is a phosphor layer arranged on a carrier with a TIR optical element disposed upstream. 
     
     
         12 . The lighting device as claimed in  claim 1 , wherein the second laser radiation emitted by the at least one second laser comprises two or more laser emission wavelengths. 
     
     
         13 . A method for operating a lighting device as claimed in  claim 1 , wherein the laser radiation of the at least one second laser is emitted at least occasionally simultaneously with the irradiation of the at least one phosphor with the laser radiation of the at least one first laser. 
     
     
         14 . The method as claimed in  claim 13 , wherein the at least one first laser and the at least one second laser are operated simultaneously in continuous-wave operation. 
     
     
         15 . The method as claimed in  claim 13 , wherein the laser radiation of the at least one second laser is clocked with temporal overlap with respect to a cyclically repeating phase of a phosphor conversion. 
     
     
         16 . The method as claimed in  claim 13 , wherein the wavelength-converted colored light emitted by the at least one phosphor and the second laser radiation of identical color are fed simultaneously into the optical integrator.