CN101667620A - 一种白光发光二极管 - Google Patents

一种白光发光二极管 Download PDF

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CN101667620A
CN101667620A CN200910190308A CN200910190308A CN101667620A CN 101667620 A CN101667620 A CN 101667620A CN 200910190308 A CN200910190308 A CN 200910190308A CN 200910190308 A CN200910190308 A CN 200910190308A CN 101667620 A CN101667620 A CN 101667620A
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邢其彬
孙平如
侯利
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Shenzhen Jufei Optoelectronics Co Ltd
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Abstract

本发明公开了一种白光发光二极管，包括载体以及发光芯片，该载体设置腔体，用来激发形成白光的荧光胶将发光芯片封装在载体的腔体内，该荧光胶与腔体底部和侧壁结合处形成用来混合光线的反射底面以及第一反射环面。该荧光胶的出光面为弧凸状曲面，紧跟第一反射环面延伸设置用来从荧光胶外部反射和混合光线的第二反射环面。本发明通过设置第二反射环面将出射的光线再次反射进入荧光胶内进行充分混合，显著提高白光均匀性，解决了传统白光发光二极管出现的中心偏蓝和周围偏黄的问题；同时，与增加扩散物的方法相比，比如增加硅粉，本发明的白光发光二极管的亮度更高。

Description

一种白光发光二极管
技术领域
本发明涉及发光二极管，具体涉及一种提高出光均匀性，同时不降低发光亮度的白光发光二极管。
背景技术
随着节能半导体照明产业发展日趋成熟，发光二极管的应用也变得越来越广泛。发光二极管利用半导体材料电子与空穴复合时能量带位阶的改变，以发光的形式释放能量，具有体积小、寿命长、驱动电压低、反应速度快、耐震性能好等优点，应用在很多领域。白光发光二极管可应用在液晶显示屏的背光照明中。用于背光照明的白光发光二极管对亮度和出光均匀性都很高。如果出光均匀性不好的话，会造成液晶显示屏的偏色或者明暗不均的光斑。
通常，白光发光二极管产生白光的原理是利用蓝光芯片作为基础光源，激发能产生互补光的荧光粉，经光线混合而成：蓝光芯片发出的蓝光一部分用来激发荧光粉，使荧光粉发出黄绿光或者红光和绿光，另一部分蓝光与荧光粉受激发后产生的黄绿光或者红光和绿光混合，产生白光。
图1和图2所示是一种现有的白光发光二极管结构示意图以及光通量分布图。该发光二极管包括载体10，该载体10包括第一金属引脚20和第二金属引脚21及腔体11。发光芯片30固定在腔体的第一金属引脚20上。发光芯片30的第一电极通过金线52连接该第一金属引脚20，第二电极通过金线54连接该第二金属引脚21。该腔体11内填充有由胶水与荧光粉组成的荧光胶体40。该荧光胶体40的出光面42为一平面，并与载体10的表面相平。请参考图2，从该种白光发光二极管的光通量分布图来看，发光芯片的正面上方荧光胶层相对较薄，发光芯片的边缘荧光胶层相对较厚，导致白光发光二极管的中心偏蓝a，周围有黄色光斑b，发光均匀性不好。
图3和图4所示是另一种现有的白光发光二极管结构示意图以及光通量分布图。该发光二极管同样包括载体10-2，该载体10-2包括第一金属引脚20-2和第二金属引脚21-2及腔体11-2。发光芯片30-2固定在腔体11-2的金属引脚20-2上。该腔体11-2内填充有由胶水与荧光粉组成的荧光胶体40-2。该荧光胶体40-2的出光面42-2为一凸出的弧面。该出光面42-2的弧面顶点到发光芯片30-2的距离R0小于出光面42-2边缘到发光芯片30-2的距离R1。请一并参考图4。从该种白光发光二极管的光通量亮度分布图来看，腔体内荧光胶层较厚，成本较高。同时侧面光线射出时，出光面的中心亮度高a，周围亮度低b，仍然无法克服有黄色光斑的问题。
因此，亟待发明一种既能提高出光均匀性同时不降低发光亮度的白光发光二极管。
发明内容
本发明要解决的技术问题是弥补上述现有技术的不足，提供一种可提高亮度，同时改善出光均匀性的白光发光二极管。
本发明的技术问题是通过以下技术方案予以解决的：一种白光发光二极管，包括载体、金属引脚和发光芯片，所述金属引脚设置于所述载体上，所述载体上开设有腔体，所述腔体侧壁由上下两个反射环面组成，所述发光芯片设置于腔体的底部且与所述金属引脚连接，于所述腔体内填充有荧光胶，该荧光胶的出光面为弧凸状曲面，该荧光胶出光面边缘与腔体侧壁结合处低于载体上表面，形成用来混合光线的第一反射环面。紧跟第一反射环面向腔体表面延伸设置第二反射环面，将出光面边缘出射的光线再次反射进入荧光胶内。
为使光线更均匀，该发光芯片和出光面顶端之间的距离R0大于发光芯片和出光面边缘之间的距离R1。
本发明与现有技术相比的有益效果是：1)本发明的白光发光二极管，紧跟第一反射环面延伸设置将出光面边缘出射的光线再次反射进入荧光胶内的第二反射环面，将出射的光线再次引入荧光胶内进行充分混合，显著提高白光均匀性，解决了传统白光发光二极管出现的中心偏蓝和周围偏黄的问题；2)本发明的白光发光二极管，该发光芯片和出光面顶端之间的距离R0大于发光芯片和出光面边缘之间的距离R1，不仅为不同颜色的光线提供混合的空间，同时，通过调整R0和R1的尺寸关系，可以改变白光发光二极管的半功率发光角度；3)本发明的白光发光二极管，该发光芯片和出光面顶端之间的距离R0大于发光芯片和出光面边缘之间的距离R1，为不同颜色的光线提供混合的空间，与增加扩散物的方法相比，比如增加硅粉，本发明的白光发光二极管的亮度更高；4)本发明的白光发光二极管，封装的荧光胶设置在发光芯片周围较小的范围内并朝外部突出，可充分减少荧光胶的用量，降低整个发光二极管的制作成本；5)本发明的白光发光二极管，该封装的荧光胶出光面边缘低于载体上表面至少0.1毫米，该种内嵌式封装荧光胶不易脱落，增强了白光发光二极管的可靠性。
附图说明
图1是一种现有发光二极管的结构示意图；
图2是现有发光二极管的光通量分布图；
图3是另一种现有发光二极管的结构示意图；
图4是另一种现有发光二极管的光通量分布图；
图5是本发明白光发光二极管的结构示意图；
图6是本发明白光发光二极管的光通量分布图。
具体实施方式
下面通过具体的实施方式并结合附图对本发明做进一步详细说明。
请参考图5和图6，本发明涉及一种白光发光二极管，本实施方式中，该白光发光二极管包括载体100、第一金属引脚120和第二金属引脚121及发光芯片130，所述金属引脚120，121设置于所述载体100上，所述载体100上开设有腔体110，所述腔体110侧壁由BC和CD两个反射环面组成，所述发光芯片130设置于腔体110的底部且与所述第一金属引脚120连接，于所述腔体110内填充有荧光胶140，该荧光胶140的出光面142为弧凸状曲面。
为了满足不同大小发光芯片130的发光需要，可以设置两对第一金属引脚与第二金属引脚。或者为了满足不同亮度的需要，可以在该载体100的腔体110的底部设置若干个发光芯片130。
本例中，该荧光胶140的出光面142为弧凸状曲面。具体来说，该发光芯片130和出光面142顶端之间的距离R0大于发光芯片130和出光面142边缘之间的距离R1。本发明中，通过调整R0和R1的尺寸关系，可改变发光二极管的半功率发光角度。
本例中，AB、BC、CD之间的夹角关系为：该反射底面AB和第一反射环面BC之间的夹角范围为130度至140度之间。优选的，该反射底面AB和第一反射环面BC之间的夹角为135度。该第一反射环面BC和第二反射环面CD之间的夹角范围为160度至170度之间。优选的，该第一反射环面BC和第二反射环面CD之间的夹角为165度。
本例中，该荧光胶140出光面142的边缘低于载体100上表面134至少0.1毫米。该种设计不仅增添了进一步混合光线的第二反射环面CD，同时，该种内嵌式封装荧光胶不易脱落，增强了白光发光二极管的可靠性。
使用时，发光芯片150发出的蓝光经反射底面AB和第一反射环面BC的反射进入荧光胶140内与荧光粉受蓝光激发产生的黄绿光或者红光和绿光混合，同时部分从荧光胶140射出出光面142的光线通过第二反射环面CD的反射再次进入荧光胶140内进行混合和折射，从而消除蓝色偏色或者黄色光斑的问题，提高整个发光二极管的出光均匀性。
以上内容是结合具体的优选实施方式对本发明所作的进一步详细说明，并不局限于本实施例。凡在本发明所属技术原则和精神内做任何修改、等同替换，都应当视为属于本发明的保护范围。

Claims (5)

1.一种白光发光二极管，包括载体以及发光芯片，所述载体设置腔体，用来激发形成白光的荧光胶将发光芯片封装在载体的腔体内，所述荧光胶与腔体底部和侧壁结合处形成用来混合光线的反射底面以及第一反射环面，其特征在于：所述荧光胶的出光面为弧凸状曲面，紧跟第一反射环面延伸设置用来从荧光胶外部反射和混合光线的第二反射环面。
2.根据权利要求1所述的白光发光二极管，其特征在于：所述发光芯片和出光面顶端之间的距离R0大于发光芯片和出光面边缘之间的距离R1。
3.根据权利要求1或2所述的白光发光二极管，其特征在于：所述反射底面和第一反射环面之间的夹角范围为130度至140度之间。
4.根据权利要求1或2所述的白光发光二极管，其特征在于：第一反射环面和第二反射环面之间的夹角范围为160度至170度之间。
5.根据权利要求1或2所述的白光发光二极管，其特征在于：所述荧光胶出光面边缘低于载体上表面至少0.1毫米。
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WO2011032439A1 (zh) * 2009-09-16 2011-03-24 深圳市聚飞光电股份有限公司 一种白光发光二极管
CN103107270A (zh) * 2011-11-09 2013-05-15 广镓光电股份有限公司 发光二极管装置
CN103415736A (zh) * 2010-10-15 2013-11-27 赤多尼科詹纳斯多夫有限公司 具有反射器的led射灯
CN103615701A (zh) * 2013-11-15 2014-03-05 广东斯科电气股份有限公司 一种白光led
CN104916761A (zh) * 2015-07-07 2015-09-16 宏齐光电子(深圳)有限公司 一种能够提高smd白光良率的led灯及其制备方法
CN105702814A (zh) * 2016-03-25 2016-06-22 映瑞光电科技(上海)有限公司 一种光电参数测试不合格的白光led芯片重加工的方法
CN108037618A (zh) * 2018-01-02 2018-05-15 厦门天马微电子有限公司 一种背光模组及液晶显示装置
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CN108666307A (zh) * 2017-03-28 2018-10-16 江苏博睿光电有限公司 一种csp光源及其制备方法
CN108666307B (zh) * 2017-03-28 2020-07-28 江苏博睿光电有限公司 一种csp光源及其制备方法
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