CN109671833B - 一种倒装cob及其制造方法 - Google Patents

一种倒装cob及其制造方法 Download PDF

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CN109671833B
CN109671833B CN201811537081.3A CN201811537081A CN109671833B CN 109671833 B CN109671833 B CN 109671833B CN 201811537081 A CN201811537081 A CN 201811537081A CN 109671833 B CN109671833 B CN 109671833B
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substrate
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aluminum oxide
cob
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徐炳健
黄巍
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Hongli Zhihui Group Co Ltd
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    • H01L33/00Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/48Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
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    • H01L25/04Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers
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    • H01L33/48Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
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Abstract

一种倒装COB及其制造方法,包括基板、设在基板上的线路层和LED芯片,所述基板从下往上依次包括铝基层、第一三氧化二铝层、二氧化钛层、银层和透明绝缘层,所述透明绝缘层为第二三氧化二铝层;所述线路层设在第二三氧化二铝层上,所述LED芯片为倒装LED芯片,所述倒装LED芯片固在第二三氧化二铝层上,且倒装LED芯片底部的电极与线路层电性连接。本发明的基板相当于镜面铝基板,其反射率高,可以有效的将倒装芯片底部的出光反射出去,从而提高COB的出光效率;本发明在基板的顶面增加了加厚的三氧化二铝层,三氧化二铝为透明结构,且一定厚度下能够绝缘,所以能够将线路层座在三氧化二铝层上,即可实现绝缘,又可使光线穿透进行反射。

Description

一种倒装COB及其制造方法
技术领域
本发明涉及LED领域,尤其是一种倒装COB及其制造方法。
背景技术
随着LED(LightEmittingDiode,发光二极管)技术的发展,其在照明行业中广泛应用的同时,市场对LED的亮度、可靠性、安装便捷性等提出更高要求,这样COB(ChipOnBoard,芯片集成到基板)的封装形式便应运而生。目前比较成熟的是正装结构的COB,将正装芯片固定在基板上,使用金线(或合金线)完成芯片间和芯片与基板线路间的电气连接,再涂覆含有荧光粉的荧光胶合成需要的光色及保护内部器件,这种结构的COB缺点非常明显:容易断线死灯、耐温低、功率密度低、固晶(将芯片贴装在基板上)工艺耗时长等。
为解决正装COB存在的问题,市面上也出现倒装COB,其COB基板包括基材层、上绝缘层、线路层、镀金层和阻焊层,基材层、上绝缘层和线路层从下至上依次设置,该种基板的表面反射率低,倒装芯片底部出光无法有效利用,导致整个倒装COB的出光效率偏低。
发明内容
本发明所要解决的技术问题是提供一种倒装COB及其制造方法,能够提高倒装COB的出光效率。
为解决上述技术问题,本发明的技术方案是:一种倒装COB,包括基板、设在基板上的线路层和LED芯片,所述基板从下往上依次包括铝基层、第一三氧化二铝层、二氧化钛层、银层和透明绝缘层,所述透明绝缘层为第二三氧化二铝层;所述线路层设在第二三氧化二铝层上,所述LED芯片为倒装LED芯片,所述倒装LED芯片固在第二三氧化二铝层上,且倒装LED芯片底部的电极与线路层电性连接。本发明的基板相当于镜面铝基板,其反射率高,可以有效的将倒装芯片底部的出光反射出去,从而提高COB的出光效率;本发明在基板的顶面增加了加厚的三氧化二铝层,三氧化二铝为透明结构,且一定厚度下能够绝缘,所以能够将线路层座在三氧化二铝层上,即可实现绝缘,又可使光线穿透进行反射。
作为改进,所述线路层包括烧结银层和设在烧结银层上的沉金层。
作为改进,所述基板上沿其边缘设有围堰,所述倒装LED芯片设在所述围堰内,且所述围堰内设有将倒装LED芯片覆盖的荧光胶体。
作为改进,围堰内设有若干相互并联的LED串联支路,每条LED串联支路由若干倒装LED芯片串联而成。
作为改进,所述线路层包括设在基板两侧且位于围堰底部的集电线路,其中一侧的集电线路与COB的正极连接,另一侧的集电线路与COB的负极连接,所述LED串联支路的两端分别与两侧人的集电线路连接。
本发明的制造方法,包括以下步骤:
(1)制作基板;
(2)在基板上固晶焊线;
(3)在基板上做围堰;
(4)在围堰内点荧光胶;
其中制造基板的具体步骤包括:
(1.1)将纳米氧化铝透明液体和胶水均匀混合后,喷涂在镜面铝基材上进行固化处理;
(1.2)液体挥发后在镜面铝基材的顶面形成第二三氧化二铝层,第二三氧化二铝层与镜面铝基材结合形成 基板,所述镜面铝基材下往上依次包括铝基层、第一三氧化二铝层、二氧化钛层、银层。
本发明与现有技术相比所带来的有益效果是:
本发明的基板相当于镜面铝基板,其反射率高,可以有效的将倒装芯片底部的出光反射出去,从而提高COB的出光效率;本发明在基板的顶面增加了加厚的三氧化二铝层,三氧化二铝为透明结构,且一定厚度下能够绝缘,所以能够将线路层座在三氧化二铝层上,即可实现绝缘,又可使光线穿透进行反射。
附图说明
图1为基板局部剖视图。
图2为倒装COB俯视图。
具体实施方式
下面结合说明书附图对本发明作进一步说明。
如图1所示,一种倒装COB,包括基板1、设在基板1上的线路层2和LED芯片7。所述基板1从下往上依次包括铝基层11、第一三氧化二铝层12、二氧化钛层13、银层14和透明绝缘层15。所述透明绝缘层15为第二三氧化二铝层,第二三氧化二铝层的厚度为500-600nm,该厚度下的三氧化铝不仅透光,而且具有绝缘性能。所述线路层2设在第二三氧化二铝层上,所述线路层2包括烧结银层21和设在烧结银层21上的沉金层22,线路沉金可以抗硫化和增加导电率。所述LED芯片7为倒装LED芯片,所述倒装LED芯片固在第二三氧化二铝层上,且倒装LED芯片底部的电极与线路层2电性连接。
如图2所示,所述基板1上沿其边缘设有围堰5,所述倒装LED芯片设在所述围堰5内,且所述围堰5内设有将倒装LED芯片覆盖的荧光胶体。围堰5内设有若干相互并联的LED串联支路6,每条LED串联支路6由若干倒装LED芯片串联而成;所述线路层2包括设在基板1两侧且位于围堰5底部的集电线路23,其中一侧的集电线路23与COB的正极3连接,另一侧的集电线路23与COB的负极4连接,所述LED串联支路6的两端分别与两侧人的集电线路23连接。
本发明的制造方法,包括以下步骤:
(1)制作基板;
(2)在基板上固晶焊线;
(3)在基板上做围堰;
(4)在围堰内点荧光胶。
其中制造基板的具体步骤包括:
(1.1)将纳米氧化铝透明液体和胶水均匀混合后,喷涂在镜面铝基材上进行固化处理;
(1.2)液体挥发后在镜面铝基材的顶面形成第二三氧化二铝层,第二三氧化二铝层与镜面铝基材结合形成 基板,所述镜面铝基材下往上依次包括铝基层、第一三氧化二铝层、二氧化钛层、银层。
本发明的基板1相当于镜面铝基板1,其反射率高,可以有效的将倒装芯片底部的出光反射出去,从而提高COB的出光效率;本发明在基板1的顶面增加了加厚的三氧化二铝层,三氧化二铝为透明结构,且一定厚度下能够绝缘,所以能够将线路层2座在三氧化二铝层上,即可实现绝缘,又可使光线穿透进行反射。

Claims (6)

1.一种倒装COB,包括基板、设在基板上的线路层和LED芯片,其特征在于:所述基板从下往上依次包括铝基层、第一三氧化二铝层、二氧化钛层、银层和透明绝缘层,所述透明绝缘层为第二三氧化二铝层;所述线路层设在第二三氧化二铝层上,所述LED芯片为倒装LED芯片,所述倒装LED芯片固设在第二三氧化二铝层上,且倒装LED芯片底部的电极与线路层电性连接;第二三氧化二铝的厚度为500-600nm。
2.根据权利要求1所述的一种倒装COB,其特征在于:所述线路层包括烧结银层和设在烧结银层上的沉金层。
3.根据权利要求1所述的一种倒装COB,其特征在于:所述基板上沿其边缘设有围堰,所述倒装LED芯片设在所述围堰内,且所述围堰内设有将倒装LED芯片覆盖的荧光胶体。
4.根据权利要求3所述的一种倒装COB,其特征在于:围堰内设有若干相互并联的LED串联支路,每条LED串联支路由若干倒装LED芯片串联而成。
5.根据权利要求4所述的一种倒装COB,其特征在于:所述线路层包括设在基板两侧且位于围堰底部的集电线路,其中一侧的集电线路与COB的正极连接,另一侧的集电线路与COB的负极连接,所述LED串联支路的两端分别与两侧的集电线路连接。
6.一种如权利要求1所述倒装COB的制造方法,其特征在于,包括以下步骤:
(1)制作基板;
(2)在基板上固晶焊线;
(3)在基板上做围堰;
(4)在围堰内点荧光胶;
其中制造基板的具体步骤包括:
(1.1)将纳米氧化铝透明液体和胶水均匀混合后,喷涂在镜面铝基材上进行固化处理;
(1.2)液体挥发后在镜面铝基材的顶面形成第二三氧化二铝层,第二三氧化二铝层与镜面铝基材结合形成基板,所述镜面铝基材从下往上依次包括铝基层、第一三氧化二铝层、二氧化钛层、银层。
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