| dc.description.abstract | There are advantages in the solid state lighting, for instance, smaller package size, higher power efficiency, longer reliability, and ROHS…etc. The energy –saving, environment effect are quite better than traditional fluorescent light tube. Hence, the potential issues are crucial to LED lighting modules and its concept designs. Owing to the spotlit of LED lighting surface sources, and its directional personalities, it lead to luminescence and yellow ring when watching to the performance. Following problems will be:
(1)Not uniform of light beams occurred when bad design added in, damage to
human eyes.
(2)In the range of spotlit, we can see an apparent light ring, especially a clear yellow ring happened in the edge. The controversy or light and dark would let our eyes exhausted.
(3)LED is a sort of point sources; we could see the multiple shadows or overlapped phenomenon when we treat it not well, furthermore, it interfere our visions.
Hereby, the thesis is to solve yellow ring issues.
For the time being, the phosphor LED package is popular. It’s an important topic to discuss its phosphor coating types and power to light efficiency, several parameters included, package designs, types of phosphor…etc., each parameter has its performance.
This thesis focus on the process of LED package compared with commercial package, and to prove the importance of uniform LED light sources.
At First, we introduce different types of LED package, evaluate the advantages and disadvantages.Then check out the possibilities by surveying patents, to choose the best performance by material, tensile strain…etc., approved by literature and simulation results. At last, finished the LED package and measured the light and electrical parameters.
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