Patent ID: 10125314

Abstract:
The invention provides a lighting device (1) comprising a plurality of solid state light sources (10) and an elongated ceramic body (100) having a first face (141) and a second face (142) defining a length (L) of the elongated ceramic body (100), the elongated ceramic body (100) comprising one or more radiation input faces (111) and a radiation exit window (112), wherein the second face (142) comprises said radiation exit window (112), 5 wherein the plurality of solid state light sources (10) are configured to provide blue light source light (11) to the one or more radiation input faces (111), wherein the blue light source light (11) has an peak maximum (λex1), wherein the elongated ceramic body (100) comprises a ceramic material (120) configured to wavelength convert at least part of the blue light source light (11) into converter light (101), wherein the ceramic material (120) comprises an 10 A3B5O12:Ce3+ ceramic material, wherein A comprises yttrium (Y) and gadolinium (Gd), and wherein B comprises aluminum (Al), wherein A comprises in the range of 10-50 atom % Gd, and wherein the ceramic material (120) comprises 0.5-3.5 mole % Ce, wherein the ceramic material (120) comprises an absorption spectrum having an absorption peak maximum (λa), wherein the peak maximum (λex1) is unequal to the absorption peak maximum (λa).