提升良率之螢光粉點膠抗沉澱技術

Anti Precipitation Technique of Phosphor Pasting for Promotion of Yield

蔡雲棠(Yun-Tang Tsai)

指導教授 ： 陳文瑞

國立虎尾科技大學/電機資訊學院/光電與材料科技研究所/碩士(2014年)

摘要

在白光發光二極體(Light Emitting Diode，LED)封裝製程中，螢光粉因為時間及重力關係會往下沉澱，沉澱後會使CIE色座標偏移，為了使螢光粉沉澱速度降低，會加入SiO2等抗沉澱物質，抗沉澱物質可能會使 LED可靠度降低及製造成本增加問題。
白光LED運用在產品點亮使用時，不希望有目視上顏色及亮度差異，因此希望每顆LED材料都是相同規格 ，但事實上是不太可能達到，只能盡量控制顏色同一規格內，若不在規格內即不能出貨，會造成成本增加。
本論文研究膠材加入螢光粉後，螢光粉因為重力沉澱導致CIE色座標偏移，在縮短監控灌膠時間也可達到控制良率，但是人力成本相對會增加，為了對抗螢光粉因為生產時間拉長，CIE色座標也隨著時間飄移問題，針對此問題研究及製作抗沉澱設備，將抗沉澱設備運用於封膠製程，使用物理原理來防止沉澱，取代並改良抗沉澱粉功效，以達到封裝良率提升。

關鍵字

螢光粉 ； 抗沉澱

並列摘要

In the white light LEDs packaging process, phosphor will precipitate down because of the time and the influence of gravity, and CIE color coordinates will shift after precipitation. In order to reduce the phosphor sedimentation rate, we try to join other anti-sediment, like SiO2. But adding anti-precipitates may cause the LED reliability decreased and the manufacturing cost increased.
When using white LED lighting product, we do not want to have color and brightness differences on the visual. But in fact it is unlikely to reach, only can try to control the color within same specifications. Products that are not within the specifications cannot be shipped, and therefore will result in increased costs.
As our study, after silicone mixed up with the phosphor powders, phosphor because gravity sedimentation resulting in CIE color coordinates shift. If we continually monitor and shorten the glue time also will be effectively to control yield. But, the labor costs will also be increased. To combat the production time because the elongated fluorescent powder caused CIE color coordinates along with the time drift problem, we do the research and try to produce the anti-sedimentation equipment as the problem solutions. The anti-precipitation equipment uses in packaging process, and we use physical principles to prevent precipitation, also replace and improve the effectiveness of anti-precipitated powders to achieve yield enhancement in packaging process.

並列關鍵字

Phosphors ； Anti precipitation

參考文獻

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