基于AC芯片一体化封装的白光LED光源研究

发布时间：2018-05-20 00:15

本文选题：白光 + LED　；参考：《长春理工大学》2017年硕士论文

【摘要】：AC LED在一个交流周期内轮流点亮两组LED晶粒,使用寿命较DC LED更长。对于白光AC LED而言,仍然存在如下问题:首先,光学一致性和色区稳定性差;其次,AC LED的发光效率低,功率不高,无法满足一些大型的商用照明的要求;最后,AC LED之间采用交流电来驱动,负载与市电之间的隔离技术还存在问题,运用时仍然存在安全隐患。本论文从AC芯片结构、半导体发光原理以及荧光粉沉淀理论等基础出发,拟采用一体化封装来解决电路的安全隐患,并通过适当控制荧光粉的沉淀现象来提高白光LED的稳定性及发光效率,主要开展了以下工作:1)采用一体化封装的方式,通过对3.5W、220V、3000K白光LED在封装过程中的荧光粉沉淀现象进行了深入的研究,设定7组不同沉降时间的对照组,对由此产生的光学一致性和色区坐标的不稳定性等问题进行分析。2)色容差研究表明,当荧光粉的沉降时间在0-20min时,色坐标的落点较为集中,中心坐标(x=0.4432±0.004,y=0.4052±0.002)位于色容差7内;30-40min时,中心坐标(x=0.4366±0.003,y=0.4012±0.003)超出色容差7,并且落点较为分散,波动性较大,不符和国标中对于普通照明LED模块性能的要求。3)基于白光LED封装的基础上,利用FLoEFD软件来模拟白光LED灯具工作时的热量分布,通过分析发现达到热学平衡状态时,LED器件的工作温度符合实验室测试标准,可以满足工业生产的需求。
[Abstract]:Ac LED turns on two groups of LED grains in one AC cycle, and the service life of AC LED is longer than that of DC LED. For white AC LED, the following problems still exist: first, the optical consistency and color stability are poor; secondly, the luminescence efficiency and power of AC LED are low, which can not meet the requirements of some large-scale commercial lighting. Finally, AC LED is driven by AC current, and the isolation technology between load and electricity still has some problems, and there are still some potential safety problems when it is used. Based on the structure of AC chip, the principle of semiconductor luminescence and the theory of phosphor precipitation, this paper proposes to adopt integrated package to solve the hidden trouble of circuit safety. The stability and luminous efficiency of white LED are improved by properly controlling the precipitation phenomenon of phosphors. The phosphor precipitation in the packaging process of 3.5WN 220V / 3000K white LED was studied. Seven groups of control groups with different settling time were set up. The analysis of the optical consistency and the instability of the coordinates in the color region. 2) the results show that when the settling time of the phosphors is 0-20min, the color coordinates are concentrated, and the central coordinates are 0.4432 卤0.004 ~ 0.4052 卤0.002) when they are located within the color tolerance 7 for 30-40 minutes. The central coordinate is 0.4366 卤0.003 + 0.4012 卤0.003), which exceeds the color tolerance by 7, and is more scattered, fluctuating and inconsistent with the national standard. 3) it is based on the white light LED package. FLoEFD software is used to simulate the heat distribution of white light LED lamps. It is found that the operating temperature of LED devices in thermal equilibrium state meets the standard of laboratory test and can meet the requirements of industrial production.
【学位授予单位】：长春理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN312.8

【参考文献】