CN102231377A - 一种高显色性的发光二极管及其制造方法 - Google Patents

一种高显色性的发光二极管及其制造方法 Download PDF

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CN102231377A
CN102231377A CN2010105941501A CN201010594150A CN102231377A CN 102231377 A CN102231377 A CN 102231377A CN 2010105941501 A CN2010105941501 A CN 2010105941501A CN 201010594150 A CN201010594150 A CN 201010594150A CN 102231377 A CN102231377 A CN 102231377A
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刘天明
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Abstract

一种高显色性的发光二极管，包括支架及支架引脚，支架上设置有杯室，杯室内固定设置有蓝光LED芯片及红光LED芯片，所述蓝光LED芯片与红光LED芯片相串联，串联的蓝光LED芯片及红光LED芯片连接支架引脚，所述杯室内设有覆盖住蓝光LED芯片及红光LED芯片的黄色荧光胶。本发明在光谱中添加了深红色，能有效改善R9测试指标低的问题。

Description

一种高显色性的发光二极管及其制造方法
技术领域
本发明涉及发光二极管技术，尤其是一种高显色性的发光二极管及其制造方法。 
背景技术
随着经济社会的发展和科学技术的不断进步，以及发光二极管领域产业化程度的不断提高，LED照明也逐渐普及，目前市场上针对各种专业领域的LED照明灯具也越来越多，这些领域对光线的要求较高，特别是展厅、画廊、办公室等场所，尤其对色彩有着高还原性的要求。 
衡量光源的色彩还原性的好坏，一般用显色指数来表示，由14个指标组成（见下表），通过对每一种颜色的对比，比较其相似度，再通过计算综合而成。 
表1  显色指数指标表 
光源的显色指数大于85，则认为是适合所有场所的照明，然而，传统的白光LED一般是由蓝光LED芯片加黄色荧光粉制作而成的，所发的白光只有蓝光和黄光光谱，光谱宽度较小而且是不连续光谱，无法把所有的色彩全部真实的还原，特别是由于普通白光缺乏深红的光谱，导致其显色指数无法有效提高。另外，对于高显色性白光LED，还有一种制作方法：可以在荧光胶中添加红色荧光粉，以达到光谱补偿的效果，但是，由于红色荧光粉的激发效率不高，会使得LED照明灯整体的发光效率降低，使用性能上还是有所不足，满足不了专业领域的照明要求，整体上不利于LED照明灯的应用和推广。
发明内容
本发明的目的在于提供一种色彩还原性好，具备高显色性的发光二极管及其制造方法。 
本发明为解决其技术问题所采用的技术方案是： 
一种高显色性的发光二极管，包括支架及支架引脚，支架上设置有杯室，杯室内固定设置有蓝光LED芯片及红光LED芯片，所述蓝光LED芯片与红光LED芯片相串联，串联的蓝光LED芯片及红光LED芯片连接支架引脚，所述杯室内设有覆盖住蓝光LED芯片及红光LED芯片的黄色荧光胶。
上述蓝光LED芯片发光后激发黄色荧光胶中的荧光粉，发出黄光，黄光再和蓝光混合所得的白光与红光LED芯片红光的光通量比为1:4~1:8。 
一种高显色性的发光二极管的制造方法，包括以下步骤： 
步骤1，把蓝光LED芯片和红光LED芯片片设置在支架的杯室中；
步骤2，把蓝光LED芯片的一极和红光LED芯片的一极连接起来，形成串联形式，并将串联在一起的蓝光LED芯片、红光LED芯片与支架引脚连接；
步骤3，在杯室中涂敷上黄色荧光粉胶。
本发明的有益效果是：本发明所采用的蓝光LED芯片和红光LED芯片串联的方式，并配合黄色荧光胶，由于荧光粉发光是物体受激发吸收能量而跃迁至激发态(非稳定态)在反回到基态的过程中，以光的形式放出能量，众所周知，发光波长越短能量越高，荧光粉受激发发光就是一个以光能换光线的过程，而且只能是高能量的光线置换低能量光线，由于蓝光的波长小于黄光，黄光波长又大于红光，因此蓝光LED芯片发出的光线能够使荧光粉发出的黄光，最终混合而射出白光，而红光LED芯片发出的光线则不能激发黄色荧光胶发出任何的可见光，因此最终照射出来为白光和红光混合的光线，相当于在光谱中添加了深红色，能有效改善R9测试指标低的问题，并且本发明不需添加红色荧光粉，对产品的亮度没有影响，而且，由于蓝光LED芯片和红光LED芯片放置在同一个杯室中，并且同时覆盖荧光粉，从外观看，和普通无异LED，而且发光颜色均匀，不会出现颜色分层，光斑不均匀等问题。本发明所采用的芯片串联的形式，不需要其他***电路，可直接接电源，通过额定电压电流而进行正常使用，结构简单，且使用效果好。 
附图说明
下面结合附图和具体实施方式进行进一步说明： 
图1为本发明的电路原理图；
图2为本发明第一种实施方式的侧视图；
图3为本发明第一种实施方式的俯视图；
图4为本发明第二种实施方式的侧视图；
图5为本发明的光谱曲线图。
 具体实施方式
具体实施方式
如图1、图2~图4所示，本发明所提供的一种高显色性的发光二极管，包括支架1及支架引脚2，如图2、图3所示，支架1可以采用贴片式的，也可以如图4所示采用直插式的，根据不同的场合选用，支架1上设置有杯室11，其中，杯室11内固定设置有蓝光LED芯片3及红光LED芯片4，该蓝光LED芯片3与红光LED芯片4采用相串联的形式，一般可由金属丝邦定连接，即蓝光LED芯片3作为一焊点，红光LED芯片4作为另一焊点，由金属线焊接在一起，最后再将串联的两芯片的两极连接到两支架引脚2，由支架引脚2引出电极，以支架引脚2接电而进行使用，通常蓝光LED芯片3的额定电压在3.0~3.5V，红光LED芯片4的额定电压则在1.8~2.2V，采用20mA的正向电流，即可保证本发明的正常使用，且不需要其他***控制电路，使用十分方便。 
本法的芯片设置，可采用蓝光LED芯片3以两极呈水平设置于杯室11内，而红光LED芯片4以两极呈垂直设置于杯室11内的结构，对于贴片式的支架1，其杯室11底部直接引入一支架引脚2，红光LED芯片4下方的一极可以直接与该支架引脚2固定设置，形成连接关系，而上方的一极则由金属线连接蓝光LED芯片3的一极，蓝光LED芯片3亦由金属线连接另一支架引脚2，以将真个串联结构的两极引出；对于直插式的支架1，其杯室11则设置在以支架引脚2，因此红光LED芯片4下方的一极直接固定连接盖杯室11内，其他接法则相同；由于蓝光LED芯片1和红光LED芯片2需要保证极性朝向相同，一般有两种接法，一种为红光LED芯片4下方的一极为正极，则其上方一极为负极，与蓝光LED芯片3的正极连接，蓝光LED芯片3的负极则连接另一支架引脚2，另一种接法，则为红光LED芯片4下方的一极为负极，则其上方一极为正极，与蓝光LED芯片3的负极连接，蓝光LED芯片3的正极则连接另一支架引脚2；两种接法，其两支架引脚2的正负极性刚好相反，使用时需加以注意区分。 
在杯室11内固定好蓝光LED芯片3及红光LED芯片4后，再涂敷黄色荧光胶5进行封装，其中，本发明所采用的原理是蓝光LED芯片3发出的光线能够激发黄色荧光胶，与其混合混合，最终射出白光，而红光LED芯片4发出的光线则不会与黄色荧光胶混合，因此最终照射出来为白光和红光混合的光线，达到提高了本发明的显色性能；根据色温的要求，本发明的红色LED芯片4的亮度和白光的亮度可在一定范围进行调整，一般来说，色温越低，红色光所占的比例越大，其光谱曲线图见图5，可看出，要得到高显色性白光，可由三基色（R红、G绿、B蓝）配合而成，各色光的光通量比例约为R：G：B=1:4.5907：0.0601，波长分别是700nm、546.1nm、435.8nm，但是在实际生产中，435.8nm的蓝光产量较低，主流一般用440-465nm的蓝光，G光一般用蓝光激发荧光粉所发出的黄绿光代替，发射峰波一般是520-580nm之间，但是发射峰波越短，荧光粉效率越低，所以荧光粉一般采用发射峰波560nm以上的；700nm的红光，由于芯片材质决定此波段亮度无法提高，故添加红光芯片一般是610-640nm，尤其是618-625nm为主，光通量的比值会有一点变化，但是具体变化不大。因此作为较佳的实施方式，本发明中，蓝光LED芯片3发光后与黄色荧光胶5混合所得的白光与红光LED芯片4红光的光通量比，一般可取1:4~1:8。 
本发明的高显色性的发光二极管，其制造可以通过下述步骤实现： 
步骤1，把蓝光LED芯片3和红光LED芯片4片设置在支架1的杯室11中；
步骤2，把蓝光LED芯片3的一极和红光LED芯片4的一极连接起来，形成串联形式，并将串联在一起的蓝光LED芯片3、红光LED芯片4与支架引脚2连接；
步骤3，在杯室11中涂敷上黄色荧光粉胶5，。
可见，本发明在白光光谱中添加了深红，能有效改善R9测试指标低的问题，并且不需添加红色荧光粉，对产品的亮度没有影响；而由于蓝光LED芯片和红光LED芯片放置在同一个碗杯中，并且同时覆盖荧光粉，从外观看，和普通无异LED，而且发光颜色均匀，不会出现颜色分层。 
以上对本发明的较佳实施进行了具体说明，当然，本发明还可以采用与上述实施方式不同的形式，这些都不构成对本实施方式的任何限制，熟悉本领域的技术人员在不违背本发明精神的前提下所作的等同的变换或相应的改动，都应该属于本发明的保护范围内。 

Claims (6)

1.一种高显色性的发光二极管，其特征在于：包括支架（1）及支架引脚（2），支架（1）上设置有杯室（11），杯室（11）内固定设置有蓝光LED芯片（3）及红光LED芯片（4），所述蓝光LED芯片（3）与红光LED芯片（4）相串联，串联的蓝光LED芯片（3）及红光LED芯片（4）连接支架引脚（2），所述杯室（11）内设有覆盖住蓝光LED芯片（3）及红光LED芯片（4）的黄色荧光胶（5）。
2.根据权利要求1所述的一种高显色性的发光二极管，其特征在于：所述蓝光LED芯片（3）发光后激发黄色荧光胶（5）中的荧光粉，发出黄光，黄光再和蓝光混合所得的白光与红光LED芯片（4）红光的光通量比为1:4~1:8。
3.根据权利要求1所述的一种高显色性的发光二极管，其特征在于：所述蓝光LED芯片（3）及红光LED芯片（4）通过金属丝邦定连接。
4.根据权利要求3所述的一种高显色性的发光二极管，其特征在于：蓝光LED芯片（1）的一极通过金属线与红光LED芯片（4）上部的一极连接，另一极通过金属线连接一支架引脚（2），所述红光LED芯片（4）下部的一极与另一支架引脚（2）固定在一起。
5.根据权利要求1所述的一种高显色性的发光二极管，其特征在于：所述支架（1）为贴片式支架或直插式支架。
6.一种高显色性的发光二极管的制造方法，其特征在于包括以下步骤：
步骤1，把蓝光LED芯片（3）和红光LED芯片（4）片设置在支架（1）的杯室（11）中；
步骤2，把蓝光LED芯片（3）的一极和红光LED芯片（4）的一极连接起来，形成串联形式，并将串联在一起的蓝光LED芯片（3）、红光LED芯片（4）与支架引脚（2）连接；
步骤3，在杯室（11）中涂敷上黄色荧光粉胶（5）。
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