Pixelated high brightness light engine
The invention provides a lighting device ( 1 ) comprising (i) a plurality of sets ( 310 ) of each one or more light sources ( 10 ) configured to provide light source light ( 11 ), and (ii) a plurality of luminescent elements ( 5 ), each luminescent element ( 5 ) comprising an elongated luminescent body ( 100 ) having a radiation input face ( 111 ) for receipt of the light source light ( 11 ), each luminescent element ( 5 ) comprising a luminescent material ( 120 ) for conversion of at least part of the light source light ( 11 ) into luminescent material light ( 8 ), and each luminescent element ( 5 ) have an luminescent element exit window ( 12 ) for the luminescent material light ( 8 ); wherein the luminescent elements ( 5 ) are configured in a configuration wherein an average distance (d 1 ) between neighboring luminescent bodies ( 100 ) is larger than a shortest luminescent element exit window distance (d 2 ) between the neighboring luminescent element exit windows ( 12 ), thereby defining an interspace ( 320 ) between the neighboring luminescent bodies ( 100 ).
1. A lighting device comprising (i) a plurality of sets of each one or more light sources configured to provide light source light, and (ii) a plurality of luminescent elements, each luminescent element comprising an elongated luminescent body having a radiation input face for receipt of the light source light, a first face and a second face,
wherein the distance between the first face and the second face defines a length (L) of the elongated luminescent body and the radiation input face extending between the first face and the second face, wherein each luminescent element comprising a luminescent material for conversion of at least part of the light source light into luminescent material light, and each luminescent element having a luminescent element exit window for escape of the luminescent material light from the luminescent element, the second face comprising said luminescent element exit window;
wherein each of the luminescent elements is configured in a tapered configuration relative to each other wherein a shortest distance (d 1 ) between the first faces of neighboring luminescent bodies is larger than a shortest luminescent element exit window distance (d 2 ) between the neighboring luminescent element exit windows, thereby defining an interspace between the neighboring luminescent bodies, and wherein the luminescent element exit windows of the plurality of luminescent elements are configured in a matrix; and,
wherein when the luminescent elements are configured in the tapered configuration, all of said luminescent element exit windows are positioned in parallel.
2. The lighting device according to claim 1 , further comprising one or more heat sinks, wherein the one or more heat sinks are at least partly configured in one or more interspaces.
3. The lighting device according to claim 2 , wherein one or more sets of light sources are in physical contact with one or more of the heat sinks.
4. The lighting device according to claim 2 , wherein the one or more heat sinks are wedge shaped with wedge faces facing neighboring luminescent bodies.
5. The lighting device according to claim 1 , wherein neighboring luminescent bodies are configured under a mutual angle selected from the range of 5-60°.
6. The lighting device according to claim 1 , comprising at least four luminescent elements, configured with the luminescent element exit window in an n×m matrix, wherein n≥2 and wherein m≥2.
7. The lighting device according to claim 1 , wherein each of the luminescent element exit windows are configured in a plane.
8. The lighting device according to claim 1 , wherein one or more luminescent elements further comprise one or more optical extension elements configured downstream of a radiation exit window of the luminescent body.
9. The lighting device according to claim 1 , wherein the luminescent element exit windows have identical sizes.
10. The lighting device according to claim 1 , wherein the elongated luminescent bodies have radiation exit windows, wherein one or more of the luminescent element exit windows comprises one or more of the radiation exit windows or wherein one or more luminescent element exit windows are configured in a light receiving relationship with one or more radiation exit windows.
11. The lighting device according to claim 1 , further comprising an optical element configured downstream of one or more luminescent element exit windows, wherein the optical element is configured for one or more of (i) facilitating extraction of luminescent material light via the one or more luminescent element exit windows to the optical element, and (ii) beam shaping luminescent material light emanating from the one or more luminescent element exit windows.
12. The lighting device according to claim 11 , wherein a single optical element is configured downstream of all luminescent element exit windows.
13. The lighting device according to claim 11 , wherein the optical element is selected from the group of a collimator and a lens.
14. A lighting system comprising one or more lighting devices according to claim 1 , and a control system, wherein two or more luminescent element are configured to provide luminescent material light with different spectral distributions, and wherein the control system is configured to control one or more sets of light sources.
15. A projection system or a luminaire comprising the lighting device according to claim 1 .
16. The lighting device according to claim 1 , wherein each luminescent body has a body axis and the tapered configuration comprises configuring the body axis of each pair of neighboring luminescent bodies to form an angle in the range of 5°-40°.