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利用温度应力加速寿命方法,测试点胶工艺白光数码管在80℃和100℃下的老化特性。实验数据表明,数码管工作一段时间后,光通量会有约1%的增量,究其原因可能为蓝光芯片和荧光粉性能在光电转换激励下,性能有提升所致。在80℃老化实验环境下,数码管红色比重增长了5.8%,蓝光光子所占比例下降了26.1%,说明白光数码管主峰随着老化时间的变化在向长波方向缓慢移动。最后利用Arrhenius关系预算出实验样品在常温工作下的平均寿命为18000小时。
Using temperature stress to speed up the life-span method, the aging characteristics of white LED tube at 80 ℃ and 100 ℃ were tested. Experimental data show that the digital tube after working for some time, the luminous flux will be about 1% increase, the reason may be the performance of the blue chip and phosphor in the photoelectric conversion incentive, the performance has improved. Under the aging test environment of 80 ℃, the red proportion of digital tube increased by 5.8% and the proportion of blue photons decreased by 26.1%, indicating that the main peak of white LED moved slowly toward long-wave with the aging time. The Arrhenius relationship is finally used to estimate the average life span of the experimental samples at room temperature for 18,000 hours.