| 摘要 |
<p>The present invention concerns a composite comprising a transparent polyurethane matrix and fluorescent particles dispersed within said matrix, characterized in that, when exposed to a blue light emitting diode said composite emits a radiation which, when mixed with the blue light transmitted through said composite, forms a white light of CCT colour which, in the CCT colour range comprised between 2000 and 10,000 K, is less than A / [fluo] B K, wherein [fluo] is the concentration in fluorescent particles expressed in mg/mm 2 of composite, and A and B are parameters, wherein A = 1100, and B = 0.8, preferably, A = 700. It also concerns a white light emitting LED device comprising such fluorescent composite and also a substrate comprising a printed pattern made of said composite.</p> |
