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1、武汉工程大学本科毕业（设计）论文12012 届毕业（设计）论文题 目 LED 结温测试技术的研究 专业班级 2008 级应用光电子 01 班 学 号 学生姓名 学 院 指导教师 指导教师职称 论文成绩 完成日期： 2012 年 6 月 3 日武汉工程大学本科毕业（设计）论文2LED 结温测试技术的研究Investigation on the measuring methods of LED junction temperature武汉工程大学本科毕业（设计）论文I摘 要随着半导体科学的发展，发光二极管(LED，Light Emitting Diode)因其效率高、寿命长、可靠性高等特点等优点正
2、向普通照明领域迅速普及，然而LED器件的热特性检测和散热是一个突出的问题，如何保持LED的结温在允许范围内，使 LED始终获得稳定的光输出和维持正常的器件寿命，一直是一个当前急待解决的课题。 本文简单介绍了LED的发展历程、发光原理、应用前景和国内外研发生产现状。研究了大功率LED 发光原理，分析了 LED的热学特性及热学参数，阐述了 LED的结温产生的原因，以及LED 结温对于其热特性的影响。提出了LED结温测量的几种方法，并对几种方法进行了比较。重点提出了一种新的非接触式结温测试法-蓝白比法，不仅可以测量单颗LED的结温，还可非接触、快速测量LED阵列的结温分布。蓝白比法是一种非接触 LE
3、D 结温测量技术，特别是对于大功率白光 LED。利用 LED管光谱中 W/B 都随结温呈现线性变化，说明大功率白光 LED 的结温非接触光谱测量方法是可行、可靠的。关键词：LED ：结温热特性 ：结温测量：蓝白比法 武汉工程大学本科毕业（设计）论文IIAbstractWith the development of the semiconductor material technology, LED meets the requirements of low-carbon economy because of their high energy saving efficiency, long l
4、ifetime and high reliability, and it is, widely used in many fields especially the fields of semiconductor lighting. However, the test of hermal performance and heat dissipation is still a prominent problemIn order to obtain stable light output and maintain normal lifetime of the devices, how to kee
5、p the junction temperature within the allowable range? This is still a burning question at present.A brief introduction of the LED development process, the history of LED , the theory of LED, application prospect and the status of the study of LED around the world included in this paper. Investigate
6、d the principle of the high power LED light, analyses thermal characteristics and thermal parameters of LED, elaborated the causation of LED junction temperature, as well as LED junction temperature for the thermal properties.The measuring methods of LED junction temperature is introduced in this pa
7、per, and several method is compared . A new non-contact method based on relative radiation intensity is proposed, blue and white ratio method , which is suitable for one single LED or the average junction temperature of LED array.The dissertation is focused on the non-contact technology of LED junct
8、ion temperature measurement, especially high power white light LED. The spectral method has been applied for the measurement and the linear relationship between the power ratio of blue light and white light， and the junction temperature has been established，to confirm that spectral method is validat
9、e for junction measurement of high power white light LEDsKeywords：LED ：thermal properties of junction temperature ： Measuring methods of LED junction temperature： Blue and white ratio method武汉工程大学本科毕业（设计）论文III目 录摘 要 .IAbstract .II第一章 文献综述 .11.1 LED 发展史 .11.2 LED 的结温 .41.3 结温测量现状与趋势 .51.4 本文研究的内容 .6第二章 大功率 LED 技术的实现 .72.1 GaN 基 LED 发光原理特性 .72.1.1 LED 的电学特性 .102.1.2 LED 的光学特性 .102.1.3 LED 的热特性 .112.2 LED 的国内外研究现状与趋势 .132.3 大功率 LED 白光存在的问题 .14第三章 结温对于 LED 参数的影响 .153.1 结温对 LED 主要参数的影响 .
