| 摘要 |
The invention provides a lighting device (100) comprising a lighting unit (70), wherein the lighting unit (70) comprises (i) at least one solid state light source (10) configured to generate light source light (11) and (ii) an elongated luminescent concentrator (70) comprising at least one light input surface (143, 144, 201) and a light exit surface (142) extending at an angle different from zero with respect to one another, wherein the at least one solid state light source (10) is configured to provide the light source light (11) to the at least one light input surface, the luminescent concentrator (70) comprising a luminescent material (20) configured to convert at least part of the light source light (11) into luminescent material light (21), wherein the lighting device is configured to generate lighting device light (101) comprising at least part of said luminescent material light (21), wherein the luminescent material (20) is configured to provide said luminescent material light (21) upon excitation by said light source light (11) in an excitation band of said luminescent material (20), wherein the light source (10) is configured to provide said light source light (11) with a full width half maximum (FWHM) of equal to or less than 20 nm, and wherein said light source (10) is configured to excite the luminescent material (20) in an isosbestic point of said excitation band. |
