CN1538534A - 白光发光装置 - Google Patents

白光发光装置 Download PDF

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CN1538534A
CN1538534A CNA031164293A CN03116429A CN1538534A CN 1538534 A CN1538534 A CN 1538534A CN A031164293 A CNA031164293 A CN A031164293A CN 03116429 A CN03116429 A CN 03116429A CN 1538534 A CN1538534 A CN 1538534A
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郑荣彬
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Abstract

一种白光发光装置，尤指一种具有纯白光发光二极管(LED)装置。该装置包含有光半导体做为蓝光的光源；荧光层是胶合覆接于光半导体上；荧光层是由红色、绿色二种颜色的荧光粉加上透明胶均匀混合而成，荧光层中的红色荧光系受到蓝光的激发，发出光谱(波长)与蓝光不同的光，绿色荧光系受到蓝光的激发，发出光谱(波长)与蓝光不同的光，该二种不同的光谱(波长)加上部分未被激发的蓝光光谱，就混合形成白光。本发明的优点：红色或橘红色与绿色混合成的荧光层可改变蓝光光源的波长，进而发出光谱与蓝光光源不同的光，以产生强度较强且白颜色纯的白光发光装置。

Description

白光发光装置
所属技术领域
本发明涉及一种白光发光装置，尤指一种具有纯白光发光二极管(LED)装置。
背景技术
按常知的白光LED，其典型的范例，如台湾专利公告号第385063号(新白光LED)发明案，其系利用紫外光半导体为光源来激发以红、绿、蓝(R、G、B)三色萤光粉与透明胶混合的包复层，使产生白色光显现。
然此种发光装置的光源系紫外光，该紫外光会对目前所泛用的环氧树脂结构造成破坏，致使最后的(白光)会产生光衰减的问题，白光亮度不强，尤其该案的包复层是由红、绿、蓝三种颜色萤光粉混合而成，三种颜料的比值、制程较难以控制又是其缺点之一。
台湾专利公告号第383508号(发光装置及显示装置)专利案，其光致发光的萤光体系包含有Y、La、Gd与Sm一组中所选出的至少一元素与自Al、Ga与In一组中所选出的至少一元素，且由铈致活的石榴石系(garnet)萤光体。
然而由铈致活的石榴系萤光体，实质上为一种黄色萤光体，其中以可发出短波长蓝色光的氮化钆系半导体发光元件为光源，其光源发射蓝光以激发黄色萤光层藉以产生不同波长的白光显现，由于仅其单一波长的光与部份未被激发的蓝色光混合，故其演色性差，即白色光失真不纯，主要惩结，是在萤光体缺乏红色之光谱。
发明内容
为了克服上述不足之处，本发明的主要目的旨在提供一种白光发光装置，借助以蓝光发光二极管为光源，用以激发红色(或橘红色)与绿色混合成的萤光层，使萤光层可改变蓝光的波长，进而发出光谱与蓝光不同的光，以产生强度较强，不会色衰减及于人眼视觉为纯白色的白光显现。
本发明要解决的技术问题是：要解决如何发明出一种白光强度强且白颜色纯的白光发光装置等技术问题。
本发明解决其技术问题所采用的技术方案是：该装置包含有：光半导体做为蓝光的光源；萤光层是胶合复接于光半导体上；萤光层是由红色、绿色二种颜色的萤光粉加上透明胶均匀混合而成，萤光层中的红色萤光系，受到蓝光的激发，发出光谱(波长)与蓝光不同的光，绿色萤光系，受到蓝光的激发，发出光谱(波长)与蓝光不同的光，该二种不同的光谱(波长)加上部份未被激发的蓝光光谱，混合形成白光。
所述的白光发光装置，其中红色萤光粉是为YAG:EU系(即以铕元素致活的石榴系)，而绿色萤光粉为SrGa2S4:EU系(即以铕元素致活的石榴系)，其中红色萤光系，受蓝光光源触发后的发光光谱(波长)为620nm，而绿色萤光系受蓝光光源触发后的发光光谱(波长)为520nm，蓝光发光光谱介于430～480nm间。
所述的白光发光装置，其中红色光萤光粉可由橘红色的萤光粉替代，该橘红色萤光粉可为YAG:Ce系(即以铈为致活的石榴系)，其受蓝光光源触发后的发光光谱为590nm。
所述的白光发光装置，其中萤光层可将光半导体包复封装成粒状结构。
所述的白光发光装置，其中光半导体及萤光层可填充复接于反射盖的上缺口中，上缺口中的内壁面形成光的反射面。
一种白光发光装置，包含有：一光半导体做为蓝光的光源，一内具凹槽的帽套，该帽套是由透明胶一体成型，其凹槽壁面均匀涂或镀上一层萤光层，该萤光层可由红色或橘红色与绿色萤光粉及透明胶均匀混合而成；帽套可套罩于光半导体上。
所述的白光发光装置，其中帽套可直接由红色或橘红色与绿色的萤光粉与透明胶均匀混合成型，使帽套直接形成萤光层
本发明的有益效果是：红色或橘红色与绿色混合成的萤光层可改变蓝光光源的波长，进而发出光谱与蓝光光源不同的光，以产生强度较强且白颜色纯的白光发光装置。
附图说明
下面结合附图和实施例对本发明进一步说明。
附图1是本发明的纵向断面图；
附图2是本发明另一实施例纵向断面图；
附图3是本发明再一实施例纵向断面图；
附图4是本发明与反射盖粘着的纵向断面图；
附图5是本发明与反射盖粘着的再一实施例断面图。
附图中标号说明：
10-光半导体；
12-导电胶；
14-绝缘胶；
20-萤光层；
30-左导线架；
32-右导线架；
35-绝缘元件；
50-帽套；
52-凹槽；
521-凹槽壁；
60-反射盖；
62-上缺口；
80-透明胶；
S1、S2-接脚；
S、S3、S4-引线。
具体实施方式
首先请参阅附图1、2、3所示，本发明包含有：光半导体10做为蓝光的光源；萤光层20是胶合复接于光半导体10上；萤光层20是由红色、绿色二种颜色的萤光粉加上透明胶均匀混合而成，萤光层20中的红色萤光系，受到蓝光的激发，发出光谱(波长)与蓝光不同的光，绿色萤光系，受到蓝光的激发，发出光谱(波长)与蓝光不同的光，该二种不同的光谱(波长)加上部份未被激发的蓝光光谱，混合形成白光。
所述的白光发光装置，其中红色萤光粉是为YAG:EU系(即以铕元素致活的石榴系)，而绿色萤光粉为SrGa2S4:EU系(即以铕元素致活的石榴系)，其中红色萤光系，受蓝光光源触发后的发光光谱(波长)为620nm，而绿色萤光系受蓝光光源触发后的发光光谱(波长)为520nm，蓝光发光光谱介于430～480nm间。
所述的白光发光装置，其中红色光萤光粉可由橘红色的萤光粉替代，该橘红色萤光粉可为YAG:Ce系(即以铈为致活的石榴系)，其受蓝光光源触发后的发光光谱为590nm
所述的白光发光装置，其中萤光层20可将光半导体10包复封装成粒状结构(如图1所示)。
所述的白光发光装置，其中光半导体10及萤光层20可填充复接于反射盖60的上缺口62中，上缺口62中的内壁面形成光的反射面(如图4、5所示)。
本发明再提供一种白光发光装置(如图2所示)，包含有：一光半导体10做为蓝光的光源，一内具凹槽52的帽套50，该帽套50是由透明胶80一体成型，其凹槽壁面521均匀涂或镀上一层萤光层20，该萤光层20可由红色(或橘红色)与绿色萤光粉及透明胶80均匀混合而成；帽套50可套罩于光半导体10上。
所述的白光发光装置，其中帽套50可直接由红色或橘红色与绿色的萤光粉与透明胶80均匀混合成型，使帽套50直接形成萤光层20(如图3所示)。
实施方式：
(1).如图1所示，本装置是以光半导体10为中心，其底部为导电体藉导电胶12连接于左导线架30，萤光层20系包覆封装于光半导体10上，引线S由光半导体10上方穿梭出并连接于右导线架32上，以形成电气回路，其中透明胶80将光半导体10、萤光层20及左、右导线架30、32上半段予以包覆以形成粒状结构。
光半导体10最好由氮化物系化合物的半导体制成，可发射出蓝光做为光源；萤光层20是由红、绿色二种颜色的萤光粉与透明胶以适当的比例混合而成，当光半导体10发出蓝光时，蓝光的波长主峰值介于430～480nm范围，而萤光层20中的红色萤光粉系为YAG:EU系(即以铕元素致活的石榴系)，当红色萤光层系受蓝光的激发时，就改变蓝光波长，而以光谱波长的主峰值为620nm向外发射出，绿色萤光粉系SrGa2S4:EU系(即以铕元素致活的榴化系)其受蓝光的激发，就改变蓝光波长，而以光谱波长的主峰值为520nm发射出。因此红、绿色萤光层系吸收蓝光的一部份波长并改变蓝光470nm的波长，进一步发出二种波长(即620nm、520nm)且与蓝光波长不同的光，该二不同波长的光加上部份未被激发之蓝光，这三种不同波长的光聚集混合，被人眼视觉时，就被定义为白光。由于该白光的产生是非与紫外光光源混合，因此所得的纯白光具有强度强，不虞色衰减，尤有甚者是以三色光(R、G、B)的混合来产生白光，使其演色性佳。
(2).如图2所示，表示帽套50是内呈圆凹槽52，其凹槽壁521上，被均匀涂覆或或镀上一层萤光层20，该帽套50套接于光半导体10左、右导线架30、32上，藉此当光半导体10发射出蓝光时，可激发萤光层20中的红、绿色萤光材料，以发出二种波长不同的光，并经透明的帽套50透射出，圆凹槽52内的空间可呈真空状，光半导体10其正、负极导电接脚S1、S2分别焊接于左、右导线架30、32上，左、右导线架30、32之间以绝缘组件35区隔，以形成电气回路。第3图所示帽套50是由萤光层20一体压模成型，因此帽套50即为萤光层20，同样可发出二种波长不同的光。
如第4图所示，是一反射盖60为基座，萤光层20填充嵌覆于上缺口62中，光半导体10底部以绝缘胶14固接于上缺口62的底部，引线S3、S4分别连接于左、右导线架30、32上，以形成电气回路，光半导体10所发射的蓝光，以及蓝光与萤光层20中所发出的红、绿光均可由上缺口62其内壁面的反射出上缺口62外，以使在萤光层20上，显现白光。
如第5图所示，是反射盖60与萤光层20及光半导体10结合，其功效与第4图技术相同，惟光半导体10的引线S3、S4是分别由底部穿梭出，进一步分别连接于左、右导线架30、32上，以形成电气回路。
(3).本案萤光层20中之红色萤光粉元素亦可由橘红色萤光粉来替代，该橘红色萤光粉可为YAG:Ce系(即以铈元素为致活的石榴)，其被激发之发光光谱的波长主峰值为590nm，橘红色萤光粉可与缘色萤光粉及透明胶均匀混合，以形成萤光层20，此萤光层20同样吸收光半导体10所发射的蓝光，进一步被触发出二种不同波长590nm及520nm的光加上部份未被触发之蓝光(其波长为470nm)，彼此混合就显现被定义为“纯白色”之光。

Claims (7)

1、一种白光发光装置，包含：光半导体做为蓝光的光源；萤光层是胶合复接于光半导体上；其特征在于：萤光层是由红色、绿色二种颜色的萤光粉加上透明胶均匀混合而成，萤光层中的红色萤光系，受到蓝光的激发，发出光谱与蓝光不同的光，绿色萤光系，受到蓝光的激发，发出光谱与蓝光不同的光，该二种不同的光谱加上部份未被激发的蓝光光谱，混合形成白光。
2.根据权利要求1所述的白光发光装置，其特征在于：所述的红色萤光粉是为YAG:EU系，绿色萤光粉为SrGa2S4:EU系，其中红色萤光系，受蓝光光源触发后的发光光谱为620nm，绿色萤光系受蓝光光源触发后的发光光谱为520nm，蓝光发光光谱介于430～480nm间。
3.根据权利要求1所述的白光发光装置，其特征在于：所述的红色光萤光粉由橘红色的萤光粉替代，该橘红色萤光粉为YAG:Ce系，其受蓝光光源触发后的发光光谱为590nm。
4.根据权利要求1所述的白光发光装置，其特征在于：所述的萤光层将光半导体包复封装成粒状结构。
5.根据权利要求1所述的白光发光装置，其特征在于：所述的光半导体及萤光层填充复接于反射盖的上缺口中，上缺口中的内壁面形成光的反射面。
6.一种白光发光装置，包含：一光半导体做为蓝光的光源，其特征在于：一内具凹槽的帽套，该帽套是由透明胶一体成型，其凹槽壁面均匀涂或镀上一层萤光层，该萤光层由红色或橘红色与绿色萤光粉及透明胶均匀混合而成；帽套套罩于光半导体上。
7.根据权利要求6所述的白光发光装置，其特征在于：所述的帽套直接由红色或橘红色与绿色的萤光粉与透明胶均匀混合成型，帽套直接形成萤光层。
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