CN103872232A - 一种led覆晶结构及其制造 - Google Patents
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- H01L33/62—Arrangements for conducting electric current to or from the semiconductor body, e.g. lead-frames, wire-bonds or solder balls
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- H01L2224/10—Bump connectors; Manufacturing methods related thereto
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Abstract
本发明提供一种LED覆晶结构,其包括包括基板、LED芯片、第一电极、第二电极、反射层以及覆盖层,所述反射层在所述基板上一体成型,所述LED芯片倒装焊接在所述基板上,所述LED芯片设置有正电极以及负电极,所述正电极连接所述第一电极,所述负电极连接所述第二电极,所述覆盖层覆盖设置在所述LED芯片的上部。本发明的优点如下所述:导电面积大,内阻小,能承受大电流通过,减少因为内阻大引起的过大热量;发光率高,发光角度大等优点。封装工艺简化,降低了封装成本,提高了生产效率;低光衰,不因为热引起的快速光衰,从而延长了LED芯片的寿命,是普通灯具的10倍以上。
Description
技术领域
本发明涉及一种半导体结构,具体的涉及一种LED覆晶结构及其制造方法。
背景技术
LED产业是近几年最受瞩目的产业之一,发展至今,LED产品已具有节能、省电、高效率、反应时间快、寿命周期时间长、且不含汞、具有环保效益等优点,然而通常LED高功率产品输入功率绝大部分会转换为热能,一般而言,LED发光时所产生的热能若无法导出,将会使LED结面温度过高,影响产品生命周期、发光效率及稳定性等。目前覆晶式LED封装结构的散热途径,主要是藉由LED电极导线传导至系统电路板导出。但由于电极导线的散热体积有限使散热效果不明显,其热的堆积仍然对产品生命周期、发光效率产生重大影响。
发明内容
本发明针对上述提到的现有的技术存在的不足,提供一种LED覆晶结构及其制造方法。
具体的,本发明提供一种LED覆晶结构,其包括包括基板、LED芯片、第一电极、第二电极、反射层以及覆盖层,所述反射层在所述基板上一体成型,所述第一电极及第二电极焊接在所述基板上,所述LED芯片设置有正电极以及负电极,所述第一电极上部设置有固晶区域,所述LED芯片的正电极设置在所述固晶区域上,所述第二电极上部设置有接触层,所述LED芯片的负电极与所述接触层电性连接;所述覆盖层覆盖设置在所述LED芯片的上层。
优选的,所述基板为铝基板或铜板。
优选的,所述第一电极、第二电极具有不同的极性。
优选的,所述LED芯片的电性连接为覆晶方式。
优选的,所述反射层其材料是塑料或是高分子材料,例如,PPA(Polyphthalamide)塑料或是环氧树脂材料。
一种制作LED灯的方法:
S1:提供一基板及一LED芯片;
S2:固晶:先在铝基板上点上锡膏,然后用真空吸嘴将LED芯片吸起移动至与基板对应的位置,再安置在相应的位置上。
S3:烧结:通过回流焊炉使锡膏胶固化,将基板和芯片接合一起,烧结要求对材料锡膏的溶点温度进行设置回流焊炉温度曲线。
S4:调胶及脱泡:根据LED芯片的波长值和色温要求调配荧光粉和硅胶的比例,调配好硅胶之后经过离心设备进行脱泡。
S5:点胶:利用点胶设备将硅胶点在相应的位置上。
S6:烘烤:利用烤箱将硅胶烘烤固化,烤箱的温度设置为150℃,烧烤时间设置为2小时。
S7:测试:测试LED灯的光电参数、检验外形尺寸,同时根据客户要求对LED灯进行分选。
本发明的优点如下所述:导电面积大,内阻小,能承受大电流通过,减少因为内阻大引起的过大热量;发光率高,发光角度大等优点。封装工艺简化,降低了封装成本,提高了生产效率;低光衰,不因为热引起的快速光衰,从而延长了LED芯片的寿命,是普通灯具的10倍以上。
附图说明
图1为本发明的结构示意图。
具体实施方式
下面结合附图对本发明做进一步解释:
本发明提供一种LED覆晶结构,其包括包括基板1、LED芯片2、第一电极3、第二电极4、反射层6以及覆盖层5,反射层6在基板1 上一体成型,LED芯片2倒装焊接在基板1上,LED芯片2设置有正电极20以及负电极21,正电极20连接第一电极3,负电极21连接第二电极4,覆盖层5覆盖设置在LED芯片2的上部。在本实施例中,覆盖层5为蓝宝石或其他晶体。
优选的,基板1为铝基板或铜板。在其余的实施例中,基板1也可以是陶瓷板。
优选的,第一电极3、第二电极4具有不同的极性。在本实施例中,第一电极3为正性电极,第二电极4为负性电极。
优选的,第一电极3设置有固晶区域,LED芯片2设置在固晶区域41,第二电极4设置有接触层40,LED芯片2与接触层40电性连接。在本实施例中,接触层40为金属合金层。
优选的,LED芯片2的电性连接为覆晶方式。
优选的,反射层6的材料是塑料或是高分子材料,例如,可以是PPA(Polyphthalamide)塑料或是环氧树脂材料。
下面结合实施例对制作上述覆晶LED结构的一种LED封装方法做进一步解释:
S1:首先提供一铝基板1及一LED芯片2;
S2:固晶:先在铝基板1上点上锡膏,然后用真空吸嘴将LED芯片2吸起移动至与铝基板对应的位置,再安置在相应的位置上。
S3:烧结:通过回流焊炉使锡膏胶固化,将铝基板和芯片接合一起,烧结要求对材料锡膏的溶点温度进行设置回流焊炉温度曲线。
S4:调胶及脱泡:根据LED芯片2的波长值和色温要求调配荧光粉和硅胶的比例,调配好硅胶之后,经过离心设备进行脱泡。
S5:点胶:利用点胶设备将硅胶点在相应的位置上。
S6:烘烤:利用烤箱将硅胶烘烤固化,烤箱的温度设置为150℃,烧烤时间设置为2小时。
S7:测试:测试LED灯的光电参数、检验外形尺寸,同时根据客户要求对LED灯进行分选。
在本发明中,蓝宝石、硅胶以及金属合金的导热系数如下所示:
覆晶焊接的封装不存在金线的焊线弧度,能够实现超薄型的平面封装。传统封装方式金线的拉力仅为10g左右,而覆晶焊接的接触面的拉力达到500g以上,覆晶封装可以抵抗一定的表面挤压而不影响LED的光电性能,适合于狭小的应用空间内。例如手机、摄像机、背光等领域。同时在多芯片的集成中,均能发挥超薄、易安装、高集成的优势。
本发明的优点如下所述:导电面积大,内阻小,能承受大电流通过,减少因为内阻大引起的过大热量;发光率高,发光角度大等优点。封装工艺简化,降低了封装成本,提高了生产效率;低光衰,不因为热引起的快速光衰,从而延长了LED芯片的寿命,是普通灯具的10倍以上。
所属技术领域的技术人员应当理解:在不脱离本发明的基本原理的情况下,可以对本发明进行各种修改、润饰、组合、补充或技术特征的替换,这些等同替换方式或明显变形方式均落入本发明的保护范围之内。
Claims (7)
1.一种LED覆晶结构,其特征在于:其包括包括基板、LED芯片、第一电极、第二电极、反射层以及覆盖层,所述反射层在所述基板上一体成型,所述第一电极及第二电极焊接在所述基板上,所述LED芯片设置有正电极以及负电极,所述第一电极上部设置有固晶区域,所述LED芯片的正电极设置在所述固晶区域上,所述第二电极上部设置有接触层,所述LED芯片的负电极与所述接触层电性连接;所述覆盖层覆盖设置在所述LED芯片的上层。
2.根据权利要求1所述的LED覆晶结构,其特征在于:所述基板为铝基板或铜板。
3.根据权利要求1所述的LED覆晶结构,其特征在于:所述第一电极、第二电极具有不同的极性。
4.根据权利要求1所述的LED覆晶结构,其特征在于:所述LED芯片的电性连接为覆晶方式连接。
5.根据权利要求1所述的LED覆晶结构,其特征在于:所述反射层的材料是塑料或高分子材料。
6.根据权利要求5所述的LED覆晶结构,其特征在于:所述反射层的PPA塑料或环氧树脂。
7.一种根据权利要求1-6中任意权利要求所述的LED覆晶结构制作LED灯的方法,其特征在于,其包括以下步骤:
S1:提供一基板及一LED芯片;
S2:固晶:先在基板上点上锡膏,然后用真空吸嘴将LED芯片吸起移动至与基板对应的位置,再安置在相应的位置上;
S3:烧结:通过回流焊炉使锡膏胶固化,将基板和芯片接合一起,烧结要求对材料锡膏的溶点温度进行设置回流焊炉温度曲线;
S4:调胶及脱泡:根据LED芯片的波长值和色温要求调配荧光粉和硅胶的比例,调配好硅胶之后经过离心设备进行脱泡;
S5:点胶:利用点胶设备将硅胶点在相应的位置上;
S6:烘烤:利用烤箱将硅胶烘烤固化,烤箱的温度设置为150℃,烧烤时间设置为2小时,防止荧光粉发生沉淀;
S7:测试:测试LED灯的光电参数、检验外形尺寸。
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CN103337583A (zh) * | 2013-06-26 | 2013-10-02 | 深圳雷曼光电科技股份有限公司 | Led倒装结构及倒装工艺 |
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CN106098911A (zh) * | 2016-06-22 | 2016-11-09 | 深圳市领德奥普电子有限公司 | 可一次配光成型的散热式灯板及其制作方法 |
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