CN102687266B - 基于紫光led的白光发光装置 - Google Patents
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Abstract
一种基于紫光LED的白光发光装置，包括外壳(3)、支撑板(2)、紫光LED半导体光源(1)、掺杂Eu离子的高硅氧发光玻璃板(4)和荧光粉层(5)。外壳(3)内设有支撑板(2)和与紫光LED半导体光源(1)相对的掺杂Eu离子的高硅氧发光玻璃板(4)。在支撑板(2)上设有至少一个发射波长在210nm～410nm范围内的紫光LED半导体光源(1)，掺杂Eu离子的高硅氧发光玻璃板(4)背向紫光LED半导体光源(1)的一面上设有由黄色荧光粉与红色荧光粉的混合物、绿色荧光粉与红色荧光粉的混合物和黄色荧光粉中的一种形成的荧光粉层(5)。该基于紫光LED的白光发光装置具有高光转换效率和高显色系数。
Description
技术领域
本发明属于照明技术领域，涉及一种发光装置，尤其涉及一种基于紫光LED的白光发光装置。
背景技术
发光玻璃是近年来发展起来的新型发光材料，其中高硅氧发光玻璃系列发光材料可以被紫光高效激发，发光光谱覆盖可见光区域。高硅氧发光玻璃系列发光材料的制备方法是采用SiO2含量超过95wt%（重量百分比）的多孔玻璃为基质玻璃，通过溶液浸渍法将多孔玻璃浸入含活性离子（如Eu、Ce、Tb、Cu、Zn、Sn等）的水溶液、酸溶液或有机溶液中，再经高温（1050℃以上）在空气或还原气氛中烧结而成。
目前，紫光LED芯片与三基色荧光粉组合实现白光发光成为白光LED的一个发展趋势，与用蓝光LED（460nm）和YAG：Ce黄色荧光粉结合产生白光的方式相比，它具有显色性高的特点。但是，适合紫外光LED所用三基色荧光粉的光激发转换效率并不高，须进一步提高。
发明内容
本发明要解决的技术问题在于，针对现有技术中紫光LED芯片与三基色荧光粉组合实现白光发光，但所用的三基色荧光粉的光激发转换效率较低的缺陷，提供一种光转换效率高、显色系数高的基于紫光LED的白光发光装置。
本发明解决其技术问题所采用的技术方案是：一种基于紫光LED的白光发光装置，包括外壳，外壳内设有支撑板，在支撑板上设有至少一个发射波长在210nm～410nm范围内的紫光LED半导体光源，z在外壳内还设置有与紫光LED半导体光源相对的掺杂Eu离子的高硅氧发光玻璃板，背向紫光LED半导体光源的高硅氧发光玻璃板一面设有适合450nm激发的黄色荧光粉与红色荧光粉的混合物、绿色荧光粉与红色荧光粉的混合物、黄色荧光粉中的一种形成的荧光粉层。
所述掺杂Eu离子的高硅氧发光玻璃板，其制备方法如下：选用孔径大小为几纳米到几十纳米、微孔的体积占玻璃总体积的25～40%的高硅氧多孔玻璃，将高硅氧多孔玻璃浸泡在Eu离子的浓度为0.005～0.1M的溶液中，溶剂可以为水、乙醇等，浸泡后的玻璃取出干燥后在1050℃～1200℃温度下烧结成致密的掺杂Eu离子的高硅氧发光玻璃板。
所述掺杂Eu离子的高硅氧发光玻璃板的厚度为0.1mm～50mm。
所述掺杂Eu离子的高硅氧发光玻璃板为吸收波长为210nm～410nm的光而发射波长为430～460nm蓝光的发光玻璃板。
所述的黄色荧光粉为能够吸收掺杂Eu离子的高硅氧发光玻璃板发出的蓝光而发射出黄颜色的光的材料，其最大发射峰位置在530nm～590nm。黄色荧光粉优选是具有宽谱带激发的硅酸盐荧光粉或者以Ce为激活剂的稀土石榴石体系荧光粉中的一种或两种。比如YAG：Ce体系荧光粉(如大连路明发光科技股份有限公司商品编号LMY-60-C的材料)、硅酸盐体系荧光粉(如大连路明发光科技股份有限公司商品编号LMS-550的材料)、氮化物体系荧光粉(如北京中村宇极科技有限公司商品编号ZYP560的材料)等；
所述绿色荧光粉为能够吸收掺杂Eu离子的高硅氧发光玻璃板发出的蓝光而发射出绿颜色的光的材料，绿色荧光粉的最大发射峰位置在490nm～525nm，所述绿色荧光粉优选为氯硅酸盐荧光粉或Ca3Sc2Si3O12：Ce绿色发光材料。比如化学式满足Ca8-x-yEuxMnyMg（SiO4）4Cl2的氯硅酸盐荧光粉、Ca3Sc2Si3O12：Ce荧光粉等。
所述的红色荧光粉为能够吸收掺杂Eu离子的高硅氧发光玻璃板发出的蓝光而发射出红颜色的光的材料，所述的红色荧光粉为最大发射峰位置在595nm～680nm的硫化物荧光粉或氮化物荧光粉。硫化物荧光粉选择如CaS:Eu,SrS:Eu等，氮化物荧光粉选择如北京中村宇极科技有限公司商品编号ZYP630的发光材料。
所述黄色荧光粉与红色荧光粉的混合物中，黄色荧光粉与红色荧光粉的重量比为1:0.1～1:1。
所述绿色荧光粉与红色荧光粉的混合物中，绿色荧光粉与红色荧光粉的重量比为1:0.1～1:1。
本发明采用在支撑板上设有至少一个发射波长在210nm～410nm范围内的紫光LED半导体光源，紫光LED半导体光源发射紫外光，照射在掺杂Eu离子的高硅氧发光玻璃板上，掺杂Eu离子的高硅氧发光玻璃将紫光LED发出的210nm～410nm范围内的紫外光高效地转化为发光波峰在450nm左右的强蓝光，通过调整Eu在高硅氧发光玻璃中的掺杂浓度和玻璃的厚度来控制对紫外光的吸收和蓝光的发光强度，然后蓝光再激发高硅氧发光玻璃板上设置的适合450nm激发的黄色荧光粉与红色荧光粉的混合物、绿色荧光粉与红色荧光粉的混合物、黄色荧光粉中的一种发光，蓝光和荧光粉所发的光复合形成不同色温、不同显色指数的白光，从而实现合成高显色系数的白光。
附图说明
下面将结合附图及实施例对本发明作进一步说明，附图中：
图1是掺杂Eu离子的高硅氧发光玻璃的激发光谱与发射光谱；
图2是本发明中的一种基于紫光LED的白光发光装置；
图3是黄色荧光粉LMS-550的激发与发射光谱图。
具体实施方式
以下通过实施例和附图对本发明进一步详述。
掺杂Eu的高硅氧蓝光发光玻璃的制备方法如下：
首先将含有Eu离子的原料制成含有Eu离子的水溶液、硝酸溶液、硫酸溶液、乙醇溶液或丙酮溶液，再将SiO2含量超过95wt%的高硅氧多孔玻璃浸入所述的溶液中，其中Eu离子的浓度为0.005～0.1M，根据对紫外光的吸收和蓝光的发光强度要求不同，可以将高硅氧多孔玻璃浸泡在不同浓度的Eu离子溶液中，制成不同Eu离子含量的高硅氧发光玻璃，来控制对紫外光的吸收和蓝光的发光强度，浸泡后的高硅氧多孔玻璃取出干燥，然后放入高温炉中，在95%N2+5%H2还原气氛下，经过1050℃～1200℃的高温烧结2小时，关闭高温炉电源，让玻璃随炉冷却，制得掺有Eu的高硅氧蓝光发光玻璃。图1给出了掺杂Eu离子的高硅氧发光玻璃的激发光谱与发射光谱，从图中可以看出，该种玻璃强烈的吸收240nm～410m左右的紫外光，实现450nm左右的强蓝光发射。
本发明实施例中所采用的适合450nm激发的黄、绿、红荧光粉均可采用市售商业，直接加以利用。
实施例1，如图2所示，一种基于紫光LED的白光发光装置，包括外壳3，外壳3内设有支撑板2，在支撑板2上设有至少一个发射波长在210nm～410nm范围内的紫光LED半导体光源1，本实施例设置四个紫光LED半导体光源1，外壳1内还设置有与紫光LED半导体光源1相对的掺杂Eu离子的高硅氧发光玻璃板4，紫光LED半导体光源1与掺杂Eu离子的高硅氧发光玻璃板4之间留有间距，背向紫光LED半导体光源的高硅氧发光玻璃板一面设有黄色荧光粉与红色荧光粉的混合物、绿色荧光粉与红色荧光粉的混合物、黄色荧光粉中的一种形成的荧光粉层5。荧光粉层5是将上述荧光粉分散在透明的环氧树脂中以旋涂或喷涂等方式直接涂敷在高硅氧发光玻璃板4的表面形成的。
实施例2，一种基于紫光LED的白光发光装置，其荧光粉层5中的黄色荧光粉是具有宽谱带激发的硅酸盐荧光粉，本实施例选用大连路明发光科技股份有限公司LMS系列稀土激活的硅酸盐荧光粉（商品编号LMS-550），本实施例装置的结构、紫光LED的选择及荧光粉的涂敷方式同实施例1，在此不再赘述。
黄色荧光粉LMS-550的激发与发射光谱见图3，从其激发光谱可以看出LMS-550荧光粉可以高效的吸收从300nm到460nm左右的蓝紫光而发射出550nm左右的黄光。在本装置中，紫光LED发射出的365nm的紫光大部分被掺杂Eu的高硅氧发光玻璃板4吸收，而发射出442nm的蓝光，掺杂Eu的高硅氧发光玻璃板4发射的蓝光又可以被高硅氧发光玻璃板4外涂敷的LMS-550荧光粉部分吸收而发射出黄光，剩余的蓝光和发出的黄光复合形成白光。
实施例3，一种基于紫光LED的白光发光装置，其荧光粉层5中的选用黄色荧光粉为Ce为激活剂的稀土石榴石体系荧光粉，本实施例选用大连路明发光科技股份有限公司，商品编号LMY-60-C的荧光粉。装置的结构、紫光LED的选择及荧光粉的涂敷方式同实施例1，在此不再赘述。
实施例4，一种基于紫光LED的白光发光装置，其荧光粉层5中的选用黄色荧光粉和红色荧光粉的混合物，增加了白光发光装置的显色性，黄色荧光粉和红色荧光粉的重量比为1：0.4，其中黄色荧光粉选用大连路明发光科技股份有限公司LMS系列稀土激活的硅酸盐荧光粉（商品编号LMS-550），红色荧光粉选用北京中村宇极科技有限公司ZYP650H红色荧光粉。装置的结构、紫光LED的选择及荧光粉的涂敷方式同实施例1，在此不再赘述。
实施例5，一种基于紫光LED的白光发光装置，其荧光粉层5中的选用绿色荧光粉和红色荧光粉的混合物，增加了白光发光装置的显色性，绿色荧光粉和红色荧光粉的重量比为1：0.6绿色荧光粉选用大连路明发光科技股份有限公司LMS系列稀土激活的硅酸盐荧光粉（商品编号LMS-520），红色荧光粉选用北京中村宇极科技有限公司ZYP650H红色荧光粉。装置的结构、紫光LED的选择及荧光粉的涂敷方式同实施例1，在此不再赘述。
实施例6，一种基于紫光LED的白光发光装置，其荧光粉层5中的选用绿色荧光粉和红色荧光粉的混合物，增加了白光发光装置的显色性，绿色荧光粉和红色荧光粉的重量比为1：0.5，绿色荧光粉选用Ca8-x-yEuxMnyMg（SiO4）4Cl2，，红色荧光粉选用北京中村宇极科技有限公司ZYP650H红色荧光粉，装置的结构、紫光LED的选择及荧光粉的涂敷方式同实施例1，在此不再赘述。
实施例7，一种基于紫光LED的白光发光装置，其荧光粉层5中的选用绿色荧光粉和红色荧光粉的混合物，增加了白光发光装置的显色性，绿色荧光粉和红色荧光粉的重量比为1：0.2，绿色荧光粉选用Ca3Sc2Si3O12：Ce，红色荧光粉选用CaS：Eu，装置的结构、紫光LED的选择及荧光粉的涂敷方式同实施例1，在此不再赘述。
实施例8，一种基于紫光LED的白光发光装置，其荧光粉层5中的选用绿色荧光粉和红色荧光粉的混合物，增加了白光发光装置的显色性，绿色荧光粉和红色荧光粉的重量比为1：0.1，绿色荧光粉选用Ca3Sc2Si3O12：Ce，红色荧光粉选用SrS：Eu，装置的结构、紫光LED的选择及荧光粉的涂敷方式同实施例1，在此不再赘述。
实施例9，一种基于紫光LED的白光发光装置，其荧光粉层5中的选用绿色荧光粉和红色荧光粉的混合物，增加了白光发光装置的显色性，绿色荧光粉和红色荧光粉的重量比为1：1，绿色荧光粉选用Ca3Sc2Si3O12：Ce，红色荧光粉选用CaS：Eu，装置的结构、紫光LED的选择及荧光粉的涂敷方式同实施例1，在此不再赘述。
实施例10，一种基于紫光LED的白光发光装置，其荧光粉层5中的选用黄色荧光粉和红色荧光粉的混合物，增加了白光发光装置的显色性，黄色荧光粉和红色荧光粉的重量比为1：0.1，其中黄色荧光粉选用大连路明发光科技股份有限公司LMS系列稀土激活的硅酸盐荧光粉（商品编号LMS-560），红色荧光粉选用北京中村宇极科技有限公司ZYP630H红色荧光粉。装置的结构、紫光LED的选择及荧光粉的涂敷方式同实施例1，在此不再赘述。
实施例11，一种基于紫光LED的白光发光装置，其荧光粉层5中的选用黄色荧光粉和红色荧光粉的混合物，增加了白光发光装置的显色性，黄色荧光粉和红色荧光粉的重量比为1：1，其中黄色荧光粉选用大连路明发光科技股份有限公司LMS系列稀土激活的硅酸盐荧光粉（商品编号LMS-555），红色荧光粉选用北京中村宇极科技有限公司ZYP650红色荧光粉。装置的结构、紫光LED的选择及荧光粉的涂敷方式同实施例1，在此不再赘述。
Claims (9)
1.一种基于紫光LED的白光发光装置，其特征在于，包括外壳，外壳内设有支撑板，在支撑板上设有至少一个发射波长在210nm～410nm范围内的紫光LED半导体光源，外壳内还设置有与紫光LED半导体光源相对的掺杂Eu离子的高硅氧发光玻璃板，背向紫光LED半导体光源的高硅氧发光玻璃板一面设有适合450nm激发的黄色荧光粉与红色荧光粉的混合物、绿色荧光粉与红色荧光粉的混合物、黄色荧光粉中的一种形成的荧光粉层；
其中，
所述掺杂Eu离子的高硅氧发光玻璃板为吸收波长为210nm～410nm的光而发射波长为430～460nm蓝光的发光玻璃板；
所述荧光粉层吸收450nm的蓝光，剩余蓝光与所述荧光粉层所发的光复合形成白光。
2.根据权利要求1所述的基于紫光LED的白光发光装置，其特征在于，所述掺杂Eu离子的高硅氧发光玻璃板的厚度为0.1mm～50mm。
3.根据权利要求1或2所述的基于紫光LED的白光发光装置，其特征在于，所述的黄色荧光粉为最大发射峰位置在530nm～590nm的荧光粉。
4.根据权利要求3所述的基于紫光LED的白光发光装置，其特征在于，所述的黄色荧光粉是具有宽谱带激发的硅酸盐荧光粉、或者以Ce为激活剂的稀土石榴石体系荧光粉中的一种或两种。
5.根据权利要求1或2所述的基于紫光LED的白光发光装置，其特征在于，所述绿色荧光粉为最大发射峰位置在490nm～525nm的荧光粉。
6.根据权利要求5所述的基于紫光LED的白光发光装置，其特征在于，所述绿色荧光粉为氯硅酸盐荧光粉或Ca3Sc2Si3O12：Ce绿色发光材料。
7.根据权利要求1或2所述的基于紫光LED的白光发光装置，其特征在于，所述的红色荧光粉为最大发射峰位置在595nm～680nm的硫化物荧光粉或氮化物荧光粉。
8.根据权利要求1或2所述的基于紫光LED的白光发光装置，其特征在于,所述黄色荧光粉与红色荧光粉的混合物中，黄色荧光粉与红色荧光粉的重量比为1:0.1～1:1。
9.根据权利要求1或2所述的基于紫光LED的白光发光装置，其特征在于,所述绿色荧光粉与红色荧光粉的混合物中，绿色荧光粉与红色荧光粉的重量比为1:0.1～1:1。
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