| 摘要 |
The present invention relates to a laser projection system consisting of at least one first laser light source ( 1 ), a projection screen ( 7 ) and a spatial light modulator ( 6 ) for projecting a laser beam of said laser light source ( 1 ) to form an image on said projection screen ( 7 ). The projection screen ( 7 ) comprises a luminescent layer ( 9 ) which upon excitation by said laser beam emits blue light. To this end, the luminescent layer ( 9 ) contains MSi<SUB>6-a</SUB>Al<SUB>a</SUB>N<SUB>8-a</SUB>O<SUB>x+a</SUB>:Eu<SUP>2+</SUP> (with M=Sr, Ba, Ca; 0<=x<=1; 0<=a<=1) as a luminescent material. With this material laser light of a laser diode emitting in the wavelength region of 405 nm can be converted to blue light of 450 nm with high efficiency. The proposed projection system, therefore, is suitable for RGB projection using laser diodes as laser light sources.
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