CN110391322B - Led灯珠及其制备方法 - Google Patents
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Abstract
本发明提供了一种LED灯珠及其制备方法,其中,在该LED灯珠中包括:陶瓷底板;固定在陶瓷底板上的紫外LED芯片和两颗红光LED芯片,其中,在紫外LED芯片表面包括一硅胶层和一荧光胶层,所述荧光胶层由预设比例的硅胶、蓝色荧光粉和绿色荧光粉调配而成;及压制在紫外LED芯片和两颗红光LED芯片表面的硅胶透镜,有效解决现有中LED灯珠显指不高的技术问题。
Description
技术领域
本发明涉及半导体发光二极管领域,特别涉及一种LED灯珠及其制备方法。
背景技术
应用广泛的白光LED(发光二极管)通常采用“蓝光技术”与荧光粉配合形成白光,形成的光谱主要成分有波长在460nm(纳米)的蓝光和波长在560nm的黄光。但是,由于这种白光LED发出的光显色指数较低,很多市场不能进入,进而高显指产品成为了一种需求。
目前,大多数高显指产品中,采用蓝光芯片配合黄色荧光粉、绿色荧光粉及红色荧光粉得到,虽然其能一定程度上提高产品的显指参数,但是,基本上达不到Ra95以上,仍然达不到需求;另外,蓝光芯片发出的蓝光光谱峰值高,对人体人眼有伤害。
发明内容
针对上述问题,本发明旨在提供一种LED灯珠及其制备方法,有效解决现有中LED灯珠显指不高的技术问题。
为达到上述目的,本发明提供的技术方案如下:
一种LED灯珠,包括:
陶瓷底板;
固定在陶瓷底板上的紫外LED芯片和两颗红光LED芯片,其中,在紫外LED芯片表面包括一硅胶层和一荧光胶层,所述荧光胶层由预设比例的硅胶、蓝色荧光粉和绿色荧光粉调配而成;及
压制在紫外LED芯片和两颗红光LED芯片表面的硅胶透镜。
进一步优选的,在所述两颗红光LED芯片中,其中一颗的波长范围为600~630nm,另一颗的波长范围为630~660nm。
进一步优选的,在所述荧光胶层中,硅胶、蓝色荧光粉和绿色荧光粉按照质量比1:(1~3):(1~3)调配而成。
进一步优选的,所述硅胶层的厚度范围为1~7μm。
本发明还提供了一种LED灯珠的制备方法,包括:
S1按照预设比例调配硅胶、蓝色荧光粉和绿色荧光粉得到荧光胶层并固化;
S2在陶瓷底板上固定紫外LED芯片和两颗红光LED芯片;
S3在紫外LED芯片表面喷涂硅胶层;
S4将切割得到的与紫外LED芯片大小匹配的荧光胶层贴在所述硅胶层表面;
S5在紫外LED芯片和两颗红光LED芯片表面压制硅胶透镜,得到LED灯珠。
进一步优选的,在所述两颗红光LED芯片中,其中一颗的波长范围为600~630nm,另一颗的波长范围为630~660nm。
进一步优选的,在所述荧光胶层中,硅胶、蓝色荧光粉和绿色荧光粉按照质量比1:(1~3):(1~3)调配而成。
进一步优选的,所述硅胶层的厚度范围为1~7μm。
在本发明提供的LED灯珠及其制备方法中,采用紫外LED芯片激发蓝色荧光粉和绿色荧光粉得到白光,再配合红光LED芯片得到LED产品,大大提高了产品的显色指数光谱(光谱中增加了青光光谱和红光光谱),同时避免现有技术中蓝光芯片对人眼带来的伤害。
附图说明
图1为本发明中LED灯珠制备方法流程示意图;
图2为本发明中一实例中LED灯珠的光谱图。
具体实施方式
为了更清楚地说明本发明实施例或现有技术中的技术方案,下面将对照附图说明本发明的具体实施方式。显而易见地,下面描述中的附图仅仅是本发明的一些实施例,对于本领域普通技术人员来讲,在不付出创造性劳动的前提下,还可以根据这些附图获得其他的附图,并获得其他的实施方式。
为使图面简洁,各图中的只示意性地表示出了与本发明相关的部分,它们并不代表其作为产品的实际结构。
由现有的高显指产品,显指参数仍然达不到需求,且存在对人体人眼有伤害的风险,故本申请提出了一种全新的LED灯珠,具体,在该LED灯珠中包括:陶瓷底板;分别固定在陶瓷底板上的紫外LED芯片和两颗红光LED芯片,压制在紫外LED芯片和两颗红光LED芯片表面的硅胶透镜;其中,紫外LED芯片表面有一硅胶层和一荧光胶层,且荧光胶层由预设比例的硅胶、蓝色荧光粉和绿色荧光粉调配而成。
具体,在调配荧光胶层的过程中,首先将硅胶、蓝色荧光粉及绿色荧光粉按照一定的配比(1:(1~3):(1~3))混合,做成厚度在30~150μm荧光膜片;之后,放在烤箱中150℃的环境下烘烤1h~2h;接着,按照紫外LED芯片的结构使用激光或冲孔设备对荧光膜片进行切割,并将芯片电极处去除,得到上述荧光胶层(切割得到的荧光胶层的尺寸略大于紫外LED芯片的尺寸,范围在0~100μm)。硅胶层的厚度范围为1~7μm。
另外,在该LED灯珠中,两颗红光LED芯片的一颗的波长范围为600~630nm,另一颗的波长范围为630~660nm,对于红光LED芯片的尺寸根据需求光谱决定。
如图1所示,本发明还提供了一种LED灯珠的制备方法,从图中可以看出,在该制备方法中包括:
S1按照预设比例调配硅胶、蓝色荧光粉和绿色荧光粉得到荧光胶层并固化。在该过程中,首先将硅胶、蓝色荧光粉及绿色荧光粉按照一定的配比(1:(1~3):(1~3))混合,做成厚度在30~150μm荧光膜片;之后,放在烤箱中150℃的环境下烘烤1h~2h;接着,按照紫外LED芯片的结构使用激光或冲孔设备对荧光膜片进行切割,并将芯片电极处去除,得到上述荧光胶层(切割得到的荧光胶层的尺寸略大于紫外LED芯片的尺寸,范围在0~100μm)。
S2在陶瓷底板上固定紫外LED芯片和两颗红光LED芯片。具体,两颗红光LED芯片中,一颗的波长范围为600~630nm,另一颗的波长范围为630~660nm,尺寸根据需求光谱决定。
S3在紫外LED芯片表面喷涂硅胶层,厚度在1~7μm。
S4将切割得到的与紫外LED芯片大小匹配的荧光胶层贴在硅胶层表面;之后,放在烤箱中150℃的环境下烘烤1h~2h,并将芯片的电极焊好。
S5在紫外LED芯片和两颗红光LED芯片表面压制硅胶透镜,得到LED灯珠。之后,将灯珠测试、分选、贴带,入库。
在一实例中,硅胶、蓝色荧光粉及绿色荧光粉按照质量比1:1.8:2.6进行配比得到荧光膜片,将此荧光膜片贴在紫外LED芯片上,当紫外LED芯片点亮激发芯片上的荧光膜片,并在与红光LED芯片发出的红光一起混合得到白光,白光光谱如图2所示的,其中横纵坐标表示不同的波段从380~780nm,与传统的光谱图相比,其在蓝光445~460nm处没有出现尖波峰,同时补全了青光470~490nm的光谱。
Claims (4)
1.一种LED灯珠,其特征在于,所述LED灯珠包括:
陶瓷底板;
固定在陶瓷底板上的紫外LED芯片和两颗红光LED芯片,其中,在紫外LED芯片表面包括一硅胶层和一荧光胶层,所述荧光胶层由预设比例的硅胶、蓝色荧光粉和绿色荧光粉调配而成;及
压制在紫外LED芯片和两颗红光LED芯片表面的硅胶透镜;
在所述两颗红光LED芯片中,其中一颗的波长范围为600~630nm,另一颗的波长范围为630~660nm;
在所述荧光胶层中,硅胶、蓝色荧光粉和绿色荧光粉按照质量比1:(1~3):(1~3)调配而成。
2.如权利要求1所述的LED灯珠,其特征在于,所述硅胶层的厚度范围为1~7μm。
3.一种LED灯珠的制备方法,其特征在于,所述制备方法中包括:
S1 按照预设比例调配硅胶、蓝色荧光粉和绿色荧光粉得到荧光胶层并固化;
S2 在陶瓷底板上固定紫外LED芯片和两颗红光LED芯片;
S3 在紫外LED芯片表面喷涂硅胶层;
S4 将切割得到的与紫外LED芯片大小匹配的荧光胶层贴在所述硅胶层表面;
S5 在紫外LED芯片和两颗红光LED芯片表面压制硅胶透镜,得到LED灯珠;
在所述两颗红光LED芯片中,其中一颗的波长范围为600~630nm,另一颗的波长范围为630~660nm;
在所述荧光胶层中,硅胶、蓝色荧光粉和绿色荧光粉按照质量比1:(1~3):(1~3)调配而成。
4.如权利要求3所述的制备方法,其特征在于,所述硅胶层的厚度范围为1~7μm。
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