| 摘要 |
Light source comprises an element emitting light in the blue and/or UV region of the optical spectrum; and a luminophore made from an alkaline earth orthosilicate optionally activated with europium and absorbing a portion of the light emitted by the light source and emitting in another spectral region. The an alkaline earth orthosilicate has the composition: (2-x-y)SrO.x(Ba u, Ca v).(1-a-b-c-d)SiO 2.aP 2O 5bAl 2O 3cB 2O 3dGeO 2: yEu 2> +> (where x = 0-1.6; y = 0.005-0.5; x + y = 1.6; a, b, c, d = 0-0.5; u + v = 1), and/or the composition: (2-x-y)BaO.x(Sr u, Ca v).(1-a-b-c-d)SiO 2.aP 2O 5bAl 2O 3cB 2O 3dGeO 2: yEu 2> +> (where x = 0-1.6; y = 0.005-0.5; a, b, c, d = 0-0.5; u + v = 1; and x.u is at least 0.4). At least one of a, b, c and d is more than 0.01. Preferred Features: At least a part of the silicon in the luminophore can be replaced by gallium. One or more LED chips (1) are arranged on a circuit board (2) within a reflector (4) and the luminophore is dispersed in a light plate (5) arranged above the reflector. |
