Nano-Mechanical Systems Research Division, Korea Institute of Machinery and Materials (KIMM), Daejeon, Korea.
Nanotechnology. 2010 Dec 10;21(49):495704. doi: 10.1088/0957-4484/21/49/495704. Epub 2010 Nov 16.
We present a novel nanocomposite, a mixture of a CdSe/CdS/ZnS red quantum dot (QD), an Sr(2)SiO(4):Eu green phosphor and silicone resin for a color converting material. The temperature rise and the optical characteristics of the nanocomposite due to the addition of the QD have been investigated in terms of QD content ratio and the mixing components. The experimental results suggested that a small addition of QDs generated a large amount of heat during light conversion at the wavelength of QD emission. Considering the temperature rise in a nanocomposite, we applied 0.2 wt% QDs on an InGaN blue LED chip. As a result, we could achieve a white LED device with a high color rendering index of 83.2, a high luminance of 65.86 lm W(-1) and a moderate temperature increase of 94 °C. The white LED converted by the newly developed QD-phosphor nanocomposite has great potential in future illumination.
我们提出了一种新型的纳米复合材料，它是由 CdSe/CdS/ZnS 红色量子点（QD）、Sr（2）SiO（4）：Eu 绿色荧光粉和硅树脂组成的用于颜色转换材料的混合物。根据 QD 含量比和混合成分，我们研究了纳米复合材料因添加 QD 而导致的温升和光学特性。实验结果表明，在 QD 发射波长的光转换过程中，少量 QD 的添加会产生大量热量。考虑到纳米复合材料中的温升，我们在 InGaN 蓝色 LED 芯片上应用了 0.2wt%的 QD。结果，我们可以实现一种具有高显色指数 83.2、高亮度 65.86 lm W(-1)和适度温升 94°C 的白色 LED 器件。由新开发的 QD-荧光粉纳米复合材料转换的白色 LED 在未来的照明中有很大的潜力。
