White LEDs With High Optical Consistency Packaged Using 3D Ceramic Substrate
White LEDs With High Optical Consistency Packaged Using 3D Ceramic Substrate
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DOI：
10.1109/lpt.2019.2948364
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发表时间：
2019-10
影响因子：
2.6
通讯作者：
Hao-Chun Cheng;Yun Mou;Yang Peng;Mingxiang Chen
中科院分区：
文献类型：
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作者：
Hao-Chun Cheng;Yun Mou;Yang Peng;Mingxiang Chen
封装效率和光学性能是白光发光二极管封装的重要指标。为了提高封装效率和光学一致性，本文提出了在三维陶瓷基板上印刷荧光粉的晶片级WLED封装方法。在平面直镀铜(DPC)陶瓷基板上重复电镀铜杯，制备了3D陶瓷基板。调整了荧光粉浓度，实现了自然白光。对3D陶瓷基板的制作误差和WLED组件的光学性能进行了分析，以评估采用3D陶瓷基板封装的WLED组件的光学一致性。因此，3D陶瓷基板的制作误差小于1%。当荧光粉浓度设置为12.5wt%时，封装的LED获得了自然白光，发光效率为94.55lm/W，相关色温为5915K，色度坐标为(0.3166，0.3345)。WLED模块在LE(1%)、显色指数(1%)、相关色温(98K)方面具有很小的标准偏差，并且可靠性高。结果表明，采用3D陶瓷基板封装的WLED具有良好的光学一致性。
Packaging efficiency and optical performances are important indexes for white light-emitting diodes (WLEDs) packaging. In this letter, wafer-level WLEDs packaging were presented by printing phosphor on three-dimensional (3D) ceramic substrate to improve packaging efficiency and optical consistency. The 3D ceramic substrate was prepared by repeatedly electroplating copper cups on the planar direct plated copper (DPC) ceramic substrate. The phosphor concentration was adjusted to realize natural white light. The fabrication errors of the 3D ceramic substrate and the optical performances of WLED modules were analyzed to evaluate the optical consistency of the WLED modules packaged by using 3D ceramic substrate. Consequently, the fabrication errors of 3D ceramic substrate are less than 1%. When the phosphor concentration was set at 12.5 wt%, the packaged LEDs achieve a natural white light with luminous efficiency (LE) of 94.55 lm/W, correlated color temperature (CCT) of 5915 K, and chromaticity coordinate of (0.3166, 0.3345). The WLED modules exhibit small standard deviations in LE (1%), color rendering index (1%), correlated color temperature (98 K), and high reliability. The results indicate that the WLEDs packaged using 3D ceramic substrate have excellent optical consistency.