激光与光电子学进展, 2019, 56 (8): 082301, 网络出版: 2019-07-26
电流和温度应力对LED球泡灯可靠性的影响 下载: 1222次
Effects of Current and Temperature Stress on Reliability of LED Bulbs
光学器件 LED球泡灯 电流 温度 加速应力 可靠性 optical devices LED bulbs current temperature accelerating stress reliability
摘要
通过研究电流和温度应力及二者共同作用对发光二极管(LED)球泡灯可靠性的影响,分析各应力下LED球泡灯的失效机理。结果表明:在室温情况下,以电流为加速应力时,主要失效方式为蓝光芯片的退化;随电流应力的增大,荧光粉退化逐渐变为主要的失效方式,LED球泡灯的相关色温上升,显示指数增大。在温度应力或电流-温度联合应力作用下,荧光粉退化严重,出现黑化现象。此外,灯具、驱动电源、LED支架和铝基板等都发生黄化和变黑现象。这表明温度应力比电流应力更能加速LED球泡灯失效。基于外推法对电流应力下LED球泡灯的寿命进行了预测。
Abstract
The effects of current, temperature or their joint stress on the reliability of LED bulbs are studied and the failure mechanism of LED bulbs under each stress is investigated as well. It is found that the degradation of blue chips is the main failure mechanism of LED bulbs at room temperature when the current is as the accelerated stress. With the increase of current stress, the degeneration of phosphor gradually becomes the main failure mechanism, which resulted in the increases of both the correlated color temperature and the color rendering index of LED bulbs. Under the temperature stress or the joint current-temperature stress, the degeneration of phosphor is serious and the phenomenon of blackening appears. In addition, the yellowing and blackening occur in the lamps, driving power sources, LED brackets and aluminum substrates. It is indicated that the temperature stress accelerates the failure of LED bulbs more than the current stress. Finally, the lifetime of LED bulbs under the current stress is predicted by the extrapolation method.
蓝栩砚, 杨欣, 宿世臣, 章勇. 电流和温度应力对LED球泡灯可靠性的影响[J]. 激光与光电子学进展, 2019, 56(8): 082301. Xuyan Lan, Xin Yang, Shichen Su, Yong Zhang. Effects of Current and Temperature Stress on Reliability of LED Bulbs[J]. Laser & Optoelectronics Progress, 2019, 56(8): 082301.