激光与光电子学进展, 2014, 51 (5): 052301, 网络出版: 2014-04-29  

光固化时间对白光LED光学性能影响

Influence of Photocuring Time on the Optical Properties of White LED
作者单位
中国海洋大学信息科学与工程学院, 山东 青岛 266100
摘要
在贴片式白光LED 封装中的荧光粉涂覆环节采用光固化的方法,研究UV 固化时间对LED 光学性能的影响。实验选取了九种固化时间,对封装出来的样品进行外观物理特性的观察测试并对完全固化的样品进行恒流老化和光度色度参数测试。结果表明:固化时间大于120 s 时胶体基本固化;不同固化时间样品的峰值波长、色温、显色指数的最大值与最小值分别平均相差约1.2 nm、200 K、1.3 个单位;固化时间大于210 s 时,光通量的衰减率明显大于其他固化时间。该光固化胶在106.6 mW/cm2 的紫外光功率密度下,固化120~180 s 较为合适。从光学的角度探讨固化时间对LED 性能的影响,对光固化技术在LED 封装上的应用具有指导意义。
Abstract
UV-curing method is used to solidify the phosphor in the process of LED packing, the influence of UV curing time on the optical properties of LED is studied. Nine different kinds of curing time is determined in the experiment of LED packing, after packaged, test the physical character of LEDs and then select the fully cured samples to conduct aging test experiments with constant current and test their photometric &colorimetric parameters regularly. The experimental results show that the adhesive is nearly cured when the curing time is greater than 120 s, the maximum and minimum average wavelength, color temperature and color rendering index of the LEDs for different testing time have a difference of almost 1.2 nm, 200 K, 1.3 respectively for different kinds of curing time, the luminous flux decay rate is higher than others when the curing time is longer than 210 s. So, the suitable curingtime for this kind of UV radiation curing adhesive is 120~180 s under the UV power density of 106.6 mW/cm2. Studying the influence of curing time on properties of LED by optical method is instructive and meaningful to use UV curing coatings in the process of LED packing.

孙海港, 苗洪利, 李国强. 光固化时间对白光LED光学性能影响[J]. 激光与光电子学进展, 2014, 51(5): 052301. Sun Haigang, Miao Hongli, Li Guoqiang. Influence of Photocuring Time on the Optical Properties of White LED[J]. Laser & Optoelectronics Progress, 2014, 51(5): 052301.

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