Blue LED as a way of complementary colors

Blue LED + YAG phosphor white light-based packaging

As long as the color coordinate in the LED with YAG phosphor two color coordinates within the framework of the formation of a straight line, you can arbitrarily adjust the hue, and so we can see YAG phosphor concentration is low, the ratio of the blue light penetrate more, as a whole will be presented Blue tone white; relatively high concentration if the YAG phosphor, the yellow conversion rate of more light, the overall tone white and yellow.

    As mentioned above some of the blue LED as a way of complementary colors, no high-density (the percentage of resin) of the phosphor coating, it can effectively reduce the amount of phosphor used. Generally speaking, the percentage of phosphor and resin, although it will as the YAG phosphor conversion efficiency, and change the shape of bowl cup, but a low around 10 ~ 20wt% can be obtained than with white light. In addition, blue LED as the light intensity of radiation in the central axis with the surrounding distribution is the same, even if the LED chips around the same density of YAG phosphor, would still cause the shaft and the surrounding issues such as uneven lighting, which is in the future one of the topics we need to overcome.

    Lead Frame Type and Chip Type is the blue LED located in the bowl cup, and then mixed with quantitative YAG phosphor coating of resin encapsulation. As the LED has a small, energy-saving, longevity and other characteristics, it has been widely used in mobile phones, PDA and other portable information products, the backlight light source, as well as the trail guide lights and other fields.