Enhancing Angular Color Uniformity of Phosphor-Converted White Light-Emitting Diodes by Phosphor Dip-Transfer Coating
Enhancing Angular Color Uniformity of Phosphor-Converted White Light-Emitting Diodes by Phosphor Dip-Transfer Coating
复制标题
DOI：
10.1109/jlt.2013.2263334
复制
发表时间：
2013-06
影响因子：
4.7
通讯作者：
Huai Zheng;Sheng Liu;Xiaobing Luo
中科院分区：
文献类型：
--
作者：
Huai Zheng;Sheng Liu;Xiaobing Luo
在许多照明应用中强烈要求高角度颜色均匀性（ACU）。在本研究中，我们提出了一种磷光体浸渍转移涂覆方法，以实现磷光体转换白色LED的高ACU。将荧光粉混合物涂覆在LED芯片的顶面上，并通过浸渍转移涂覆形成薄且凸起的荧光粉层。光学模拟和实验进行了性能验证。数值计算和实验结果表明，该方法可以获得很高的ACU。当白色LED的平均色温（CCT）为6200 K左右时，角相关色温（CCT）偏差达到378 K，当平均CCT为4000 K左右时，角相关色温偏差减小到63 K。
High angular color uniformity (ACU) is strongly required in many illumination applications. In this study, we presented the phosphor dip-transfer coating method to realize high ACU for phosphor-converted white LEDs. The phosphor mixture was coated on top surfaces of LED chips and formed thin and convex phosphor layers by the dip-transfer coating. The optical simulations and experiments were conducted for performance verifications. Both numerical and experimental results show that the present method can obtain very high ACU. The angular correlated color temperature (CCT) deviation reaches 378 K when the average CCT of white LEDs is around 6200 K and it reduces to 63 K at the average CCT of about 4000 K.