电子信息工程专业毕业论文--白光LED的发光机理及制造难点研究.docVIP

目 录 目 录 1 摘 要 2 Abstract 3 第一章 简述白光LED发展史 4 第二章 白光LED的发光机理 5 2.1白光LED的技术概况 5 2.2 LED发光原理 5 2.2.1 LED发光机理 5 2.2.2白光LED发光原理 6 2.3白光LED的发光效率 8 2.4衬底材料 9 2.4.1 LED的衬底材料的选择 9 2.5工艺 11 2.6大功率白光LED散热技术 11 2.7白光LED技术研究 12 第三章 白光LED综述 12 3.1白光LED的特点 12 3.2白光LED的优点 13 3.3白光LED的展望 13 总 结 15 致 谢 16 参考文献 17 摘 要 所谓白光是多种颜色是多种颜色混合而成的光，以人类眼睛所能见的白光形式至少需要两种光混合，如二波长光（蓝色光+黄色光）或三波长光（蓝色光+绿色光+红色光），目前已商品化的产品仅有二波长蓝光单芯片加上YAG黄色荧光粉，在未来较被看好的是三波长光，以无机紫外光芯片加R、G、B三颜色荧光粉。用上述两种模式符合的白光都需要蓝光，所以摄取蓝光已成为制造白光LED的关键技术，即当前各大LED制造公司追逐的“蓝光技术”。此外有机单层三波长型白光LED也有成本低、制造容易的优点。预计三波长白光在未来的应用中取代荧光灯、紧凑型节能荧光灯及LCD背光源等市场，对白光LED的市场成长有很大帮助。 本文对白光LED的发光原理进行了研究，包括对发光效率，材料，工艺，封装，成本等。对于白光LED的优点进行论述，包括如发光效率，使用寿命，显色性，体积，使用方便，可靠性等。 最后，对白光LED的发展前景和未来的发展做了描述。 关键字：白光LED 材料 封装 Abstract The so-called multi-color white is a mixture of light colors to the human eye can see at least two kinds of white light mixed forms, such as the two wavelengths of light (blue light + yellow light) or three wavelength light (blue light + green light + red light), the commercialization of products currently only two single-wavelength blue-chip with the yellow YAG phosphor, more favored in the future is three wavelengths of light, in order to increase inorganic UV chips R, G, B three color phosphors. Using these two models need to meet the white light blue, so uptake of Blu-ray has become the key manufacturing white LED technology, which currently pursued by major LED manufacturer, Blu-ray technology. In addition, the organic layer three-wavelength type white light LED has low cost and easy to manufacture advantages. Expected three-wavelength white light applications in the future to replace fluorescent lamps, compact fluorescent lamps and LCD backlight and other markets, on the white LED market growth of great help.  In this paper, white LED light-emitting principle of the study, including light-emitting efficiency, materials, process, package and cost. The white paper discusses the advantages of LED, including such luminous efficiency, lifet