以離心法優化白光二極體

Optimization of White Light Emitting Diode by Centrifugation

趙世邦(Shih-Pang Chao)

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(2012年)

摘要

目前白光LED多為使用傳統混膠－點膠製程，將黃色螢光粉混合矽膠，點膠覆蓋在藍光晶片上，螢光粉不均勻的散佈在封裝體內與晶片周圍，此種方式無法控制螢光粉層厚度，以致造成色溫分散不均勻無法集中，產生黃圈、光暈影響了光形和色彩的均勻性，是影響白光LED的色彩均勻度及效率的主要因素。
本論文針對於小功率產品，使用傳統螢光粉混合矽膠－點膠製程，研究利用離心法製程將螢光粉沉降在藍光晶片發光區周圍，使得封裝體內之螢光粉層厚度均勻，使產出的白光LED色溫均勻度能有敷型塗佈與Remote Phosphor相同的效果，改善傳統混膠－點膠製程的螢光粉不均勻塗佈並有效提升色溫均勻度。
由實驗結果得到證明，透過離心法製程製作白光LED，在藍光晶片發光區周圍散佈厚度均勻的螢光粉層，確實能達到色溫均勻度較佳之成果，使白光LED可以更順利的應用在照明的設計上。

關鍵字

白光LED ； 色溫

並列摘要

Most white LED use conventional traditional mixed plastic - dispensing process, using yellow phosphor mixed silica gel and covering on the blue chip, so the phosphor are distributed unevenly around the blue chip for the packaging, and cannot control the phosphor layer thickness, resulting in uneven color temperature dispersion, cause the yellow circle appear obviously, macular and other issues is the main factor affecting the shape of light and color uniformity.
This paper aimed at low-power products, use the traditional mixed plastic – dispensing process, examine the use of centrifugal method phosphor deposition process will be light in the blue area around the chip, making the package body of the phosphor layer thickness, so that output white LED color temperature uniformity have deposited the same type of Conformal Distribution and Remote Phosphor results in improving the traditional mixed glue - colored plastic point of uneven phosphor coating process and effectively enhance the color uniformity.
From the experimental results prove that the production process through the centrifugal method white LED, the blue light-emitting chip scattered around the area of the phosphor layer thickness can indeed achieve a better color uniformity.

並列關鍵字

white LED ； color temperature

參考文獻

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