| 双层荧光粉涂覆对COB封装LED出光的影响 |
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| 引用本文： | 傅志红,武宁杰,田有锵,郭鹏程,王洪.双层荧光粉涂覆对COB封装LED出光的影响[J].应用光学,2020,41(5):1053-1059. |
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| 作者姓名： | 傅志红 武宁杰 田有锵 郭鹏程 王洪 |
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| 作者单位： | 1.中南大学 机电工程学院 高性能复杂制造国家重点实验室，湖南 长沙 410083 |
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| 基金项目： | 广东省科技计划重大项目（2015B010127013，2016B01012300，2017B010112003）；中山市科技发展专项资金重大项目（2017F2FC0002，2017A1009，2019AG014） |
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| 摘 要： | 为了提高LED出光量，基于传统的荧光粉涂覆设计了一种双层荧光粉涂覆结构。通过对上下涂覆层浓度及上层涂覆量的研究，探究双层涂覆结构对COB封装LED出光的影响。结果表明在通电电流为440 mA时，可在实验中实现15 W的COB封装结构的白光LED:涂覆单一黄色荧光粉，上下层胶粉比为14.2～28且上层涂覆体积为下层的0.8倍时，COB封装LED的光通量为2 179 lm，光效可达145.3 lm/W，显指为63，出光量最大提升为7.82%；荧光粉调整为黄绿粉和红粉的配合使用后，最终实现色温、光效及显指分别为4 854 K、129.7 lm/W和81.2。因此，双层荧光粉涂覆结构可以提高COB封装LED的光学性能，对实际生产有一定的应用价值。
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| 关 键 词： | COB封装 双层荧光粉涂覆 LED 光通量 显指 色温 |
| 收稿时间： | 2019-12-16 |
Effect of double-layer phosphor coating on LED light output of COB encapsulation |
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| Affiliation: | 1.State Key Laboratory of High Performance Complex Manufacturing, School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China2.Zhongshan Institute of Modern Industrial Technology, South China University of Technology, Zhongshan 528437, China |
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| Abstract: | In order to improve the output of LED light, a double-layer phosphor coating structure was designed based on the traditional phosphor coating. By studying the concentration of the upper-lower coating layer and the upper coating amount, the effect of the double-layer coating structure on the LED light output of the chips on board (COB) encapsulation was explored. The results show that when the current is 440 mA, a white light LED with a COB encapsulation structure of 15 W is finally realized in the experiment: 1) When only yellow phosphor is coated, the upper-lower rubber powder ratio is 14.2～28, and the volume of the upper coating layer is 0.8 times than that of the lower layer, the LED luminous flux of the COB encapsulation is 2 179 lm, the luminous efficiency can reach to 145.3 lm / W, the color rendering index is 63, and the maximum increase in light output is 7.82%. 2) The phosphor is adjusted to the combination of yellow-green phosphor and red phosphor, and the final color temperature, light efficiency and color rendering index are 4 854 K, 129.7 lm/W and 82.1, respectively. Therefore, the double-layer phosphor coating structure can improve the optical performance of the COB-encapsulated LED, which has certain application value for the actual production. |
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