CN101171692A - 使用磷光质制备白色发光二极管 - Google Patents

使用磷光质制备白色发光二极管 Download PDF

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CN101171692A
CN101171692A CNA2006800150905A CN200680015090A CN101171692A CN 101171692 A CN101171692 A CN 101171692A CN A2006800150905 A CNA2006800150905 A CN A2006800150905A CN 200680015090 A CN200680015090 A CN 200680015090A CN 101171692 A CN101171692 A CN 101171692A
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white light
phosphor
emitting diode
led chip
light
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朴晶奎
金昌海
金京南
金在明
崔京在
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Korea Research Institute of Chemical Technology KRICT
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Abstract

本发明涉及使用磷光质制备白色发光二极管(LED)的方法，特别涉及通过将红、蓝、绿三色磷光质材料混合物涂敷在由封装衬底制成的UV LED芯片上所制备的白色发光二极管，其中由于UV LED芯片发出紫光透射过三色磷光质混合物从而得到白光。特别是，本发明涉及通过在蓝色LED芯片上层压绿色和红色或者黄色和红色磷光质材料所制备的白色发光二极管，其中由于磷光质透射和吸收光从而得到白光。根据本发明所述的方法其优点在于可以用单芯片提供具有出色光致发光效率的白色发光二极管。

Description

使用磷光质制备白色发光二极管
技术领域
本发明涉及使用磷光质制备白色发光二极管(LED)的方法，特别涉及通过将红、蓝、绿三色磷光质材料混合物涂敷在由封装衬底(packaging substrate)制成的UV LED芯片上所制备的白色发光二极管，其中利用UV LED芯片发出紫光透射过三色磷光质混合物从而得到白光。
特别地，本发明涉及通过在蓝色LED芯片上层压绿色和红色或者黄色和红色磷光质材料所制备的白色发光二极管，其中利用磷光质透射和吸收光从而得到白光。
背景技术
作为下一代自然色彩显示装置，发光二极管已经引起了人们的关注。它可以被用于各种电子器件，其包括仪表面板、电视(TV)和平板显示器。
发光二极管具有下列现象。当磷光质材料受到电场作用时，阴极处发射的电子与阳极处形成的空穴相结合从而形成被称为“单激子”的激发态。在它们跃迁到基态时会发射各种光。相对于传统光致发光器件，发光二极管在光致发光效率、功耗、热稳定性、耐用性和响应上具有优点。
用于制备白色发光二极管的传统方法如下所示。
日本Nichia的台湾专利No.383508提出了使用蓝光发光芯片和黄光磷光质材料(YAG)制备白色发光二极管的方法。
由蓝光和黄光所产生的白光只适合于显示，而不适合用于照明或者LCD的背光源。另外，因为难以控制黄色磷光质材料的量，所以白光会向蓝色或黄色偏移。
韩国专利No.0164457(1998年9月12日)提出了使用稀土元素镨(Pr)作为发光中心来得到白光的(电致发光)器件，其中层压了有红、蓝、绿色光致发光光谱的白光磷光质膜。
韩国专利No.0165867(1998年9月19日)提出了具有出色的光致发光光谱分布特性的白光电致发光器件，它由ZnS:Pr，Mn发光元素制备。
韩国专利申请公开No.2003-88882(2003年11月20日)提出了通过混合ZnS发出的蓝光和ZnSSe发出的黄光来获得白光的白色发光器件。
尽管上述专利文献提供了白色发光器件，但还是需要开发更出色和更经济的并且能用单芯片提供更好的光致发光效率的白色发光二极管以及其制造方法。
发明内容
本发明旨在提供一种能够解决传统白光LED的问题并且用单芯片提供光致发光效率的白色发光二极管以及其制造方法。本发明的目的是提供一种制备白色发光二极管的方法，其中通过将红、蓝、绿三色磷光质材料混合物涂敷在由封装衬底制成的UV LED芯片上，并且将UV LED芯片发出的紫光透射过三色磷光质混合物从而得到白光，或者通过在蓝色LED芯片上层压绿色和红色或者黄色和红色磷光质材料，并且使磷光质吸收LED芯片所发出的蓝光从而得到白光。
为了达到上述目的，在实施方案中，本发明提供一种用于制备白色发光二极管的方法，该白色发光二极管包括通过Ag膏(Ag paste)附着在封装衬底的底座(mount)或者引线框架上的UV LED芯片、连接引线框架电极与UV LED芯片的Au线、以及密封和保护LED芯片和Au线的透明树脂，其中红、蓝、绿三色磷光质材料被直接或间接地涂敷在UV LED芯片上，使得当UV LED芯片所发出的紫光穿过三色磷光质材料混合物时可以获得白光。
在另一种实施方案中，本发明提供一种用于制备白色发光二极管地方法，该白色发光二极管包括通过Ag膏附着在封装衬底的底座或者引线框架上的蓝光LED芯片、连接引线框架电极与LED芯片的Au线、以及密封和保护LED芯片和Au线的透明树脂，其中，红、绿或者黄、红双色磷光质材料被直接或间接地涂敷在蓝光LED芯片上，使得当蓝光LED芯片所发出的蓝光穿过双色磷光质材料时可以获得白光。
在优选实施方案中，UV LED芯片和蓝光LED芯片发出波长范围为365到480nm的光。
红色磷光质材料选自以下至少一种材料：基于硅酸盐(silicate-based)的Sr3SiO5:Eu磷光质；基于硫化物(sulfide-based)的磷光质，其中Eu被用作活性剂并且基质(matrix)的分子式为(Srx，Cay)S，其中0≤x≤1并且0≤y≤1，典型地是SrS:Eu和CaS:Eu；以及SrY2S4:Eu磷光质。
绿色磷光质材料选自以下至少一种材料：分子式为(Srx，Bay，Caz)2SiO4:Eu的基于硅酸盐的磷光质，其中0≤x≤1，0≤y≤1并且0≤z≤1，典型地是Sr2SiO4:Eu、Ba2SiO4:Eu或者Ca2SiO4:Eu；基于硫代镓酸盐的磷光质其中Eu被用作活性剂并且基质的分子式为(Srx，Bay，Caz)Ga2S4，其中0≤x≤1，0≤y≤1并且0≤z≤1，典型地是SrGa2S4:Eu，BaGa2S4:Eu、CaGa2S4:Eu或者Sr2Ga2S5:Eu；以及分子式为基于硫代铝酸盐的磷光质(Srx，Bay，Caz)Al2S4，其中0≤x≤1，0≤y≤1并且0≤z≤1，典型地是SrAl2S4:Eu、BaAl2S4:Eu或者Sr2Al2S5:Eu。
蓝色磷光质材料选自以下至少一种材料：分子式为(Srx，Bay，Caz)3MgSi2O8:Eu的基于硅酸盐的磷光质，其中0≤x≤1，0≤y≤1并且0≤z≤1，典型地是Sr3MgSi2O8:Eu或者Ba3MgSi2O8:Eu；基于硫化物的磷光质其中Ce被用作活性剂并且基质分子式为(Srx，Cay)S，其中0≤x≤1并且0≤y≤1，典型地是SrS:Ce和CaS:Ce；以及CaAl2S4:Eu磷光质。
红色磷光质材料、绿色磷光质材料和蓝色磷光质材料按1-2∶1-2∶1-3的比例混合。
另外，红色磷光质材料和绿色磷光质材料按1-2∶1-2的比例混合。
在下文中将给出本发明的更详细描述。
在本发明中，通过使紫光或蓝光透射过在波长范围为390到480nm发射不同波长的光的磷光质材料从而获得白光。该技术不同于将黄色磷光质材料(YAG)添加到蓝光发光芯片或者将紫外(UV)光透射过三色磷光质材料混合物从而获得白光的技术。
众所周知，发光二极管包括利用Ag膏(20)附着到封装衬底(印刷电路板：PCB、陶瓷衬底、硅衬底、金属衬底等)的底座(凹进部分)或者引线框架(60)上的LED芯片、连接引线框架(60)的电极与LED芯片(10)的Au线(40)、以及密封和保护LED芯片(10)和Au线(40)的透明树脂(50)。
在本发明的实施方案中，发出紫光的UV LED芯片被用作LED芯片，并且红、蓝、绿三色磷光质材料混合物被直接或间接地涂敷到UV LED芯片上。
即，用透光环氧树脂或者硅树脂作为基材(base)，将红、蓝、绿三色磷光质材料混合物涂敷到发出紫光的UV LED芯片上。
当UV LED芯片发出的紫光穿过红、蓝、绿三色磷光质材料混合物时获得白光。
之所以在本发明中使用紫光是因为波长范围为390到410nm的光提供10mW或更好的光致发光效率，这比现有的蓝光或紫外(UV)光所提供的光致发光效率更高。此外，如稍后将述，波长范围为390到410nm的UV光使得(红、蓝、绿的)磷光质材料的光致发光更均匀。
在本发明中，基于硅酸盐或者使用Eu作为活性剂的基于硫化物的磷光质被用作红色磷光质材料，基于硅酸盐、基于硫代镓酸盐或者使用Eu作为活性剂的基于硫代铝酸盐的磷光质被用作绿色磷光质材料，而基于硅酸盐、或者使用Eu作为活性剂的硫代铝酸盐的磷光质、或者使用Ce作为活性剂的基于硫化物的磷光质被用作蓝色磷光质材料。
更具体地，红色磷光质材料选自以下至少一种材料：基于硅酸盐的Sr3SiO5:Eu磷光质；基于硫化物的磷光质，其中Eu被用作活性剂并且基质的分子式为(Srx，Cay)S，其中0≤x≤1并且0≤y≤1，典型地是SrS:Eu和CaS:Eu；以及SrY2S4:Eu磷光质。
绿色磷光质材料选自以下至少一种材料：分子式为(Srx，Bay，Caz)2SiO4:Eu的基于硅酸盐的磷光质，其中0≤x≤1，0≤y≤1并且0≤z≤1，典型地是Sr2SiO4:Eu、Ba2SiO4:Eu或者Ca2SiO4:Eu；基于硫代镓酸盐的磷光质其中Eu被用作活性剂并且基质的分子式为(Srx，Bay，Caz)Ga2S4，其中0≤x≤1，0≤y≤1并且0≤z≤1，典型地是SrGa2S4:Eu、BaGa2S4:Eu、CaGa2S4:Eu或者Sr2Ga2S5:Eu；以及分子式为基于硫代铝酸盐的磷光质(Srx，Bay，Caz)Al2S4，其中0≤x≤1，0≤y≤1并且0≤z≤1，典型地是SrAl2S4:Eu、BaAl2S4:Eu或者Sr2Al2S5:Eu。
此外，蓝色磷光质材料选自以下至少一种材料：分子式为(Srx，Bay，Caz)3MgSi2O8:Eu的基于硅酸盐的磷光质，其中0≤x≤1，0≤y≤1并且0≤z≤1，典型地是Sr3MgSi2O8:Eu或者Ba3MgSi2O8:Eu；基于硫化物的磷光质，其中Ce被用作活性剂并且基质分子式为(Srx，Cay)S，其中0≤x≤1并且0≤y≤1，典型地是SrS:Ce、CaS:Ce、或者CaAl2S4:Eu。
UV LED芯片或者蓝光LED芯片发出的光的波长范围为365到480nm。
另外，红色磷光质材料、绿色磷光质材料和蓝色磷光质材料按1-2∶1-2∶1-3的比例混合。
超出此范围，就难以获得具有所需彩色坐标(color coordinate)的白光。
在本发明的另一种实施方案中，使用蓝光LED芯片所发出的蓝光并且红、绿或者黄、红双色磷光质材料混合物被直接或间接地涂敷在蓝光LED芯片上。
即，用透光环氧树脂或者硅树脂作为基材，将红、绿双色磷光质材料混合物涂敷到蓝光LED芯片上。
红色磷光质材料和绿色磷光质材料按1-2∶1-2的比例混合。超出此范围，就难以获得具有所需彩色坐标的白光。
当蓝光LED芯片所发出的蓝光透射过红色和绿色或者黄色和红色磷光质材料的混合物时获得了白光。
当然，通过改变红、蓝、绿色磷光质的混合比例可以获得具有不同色温或色彩的光。
红、蓝、绿三色磷光质材料混合物可以通过UV光提供所需的白光，而红、绿双色磷光质材料混合物可以通过蓝光提供所需的白光。
此外，通过调整红、蓝、绿色磷光质材料的混合比例，白光的色温范围可以为3,000到10,000K，以满足客户需要。
除了上述材料之外的磷光质材料也可以被用在本发明中，只要它们吸收波长范围为365到480nm的光并且发出可见光即可。
传统上，只有波长范围为254到365nm的UV光被利用。但是，根据本发明，可以使用三色或者双色磷光质混合物以及使用发出紫光的UV LED芯片或发出蓝光的蓝光LED芯片来获得白光。
特别是，可以弥补在使用蓝光发光芯片和黄色磷光质时会发生的弱红色比例(weak red proportion)的问题。
附图说明
图1为本发明的封装型白色发光二极管的横截面示意图。
图2为图1中安装了LED的部分的横截面示意图。
图3显示了实例1中用发出405nm紫光的LED芯片和蓝、绿、红色磷光质混合物制备的白色发光二极管的光致发光光谱。
图4显示了实例2中用发出465nm蓝光的LED芯片和绿、红色磷光质混合物制备的白色发光二极管的光致发光光谱。
具体实施方式
本发明的实用和优选的实施方案如以下实例中所描述。然而，可以理解的是，本领域技术人员可以根据本公开，在本发明的精神和范围内作出修改和改进。
实例1：使用红、绿、蓝色磷光质制备白色发光二极管
用Ag膏将UV LED芯片安装到封装衬底的底座或者引线框架上。接着，红、蓝、绿三色磷光质材料混合物被直接或间接地涂敷在UV LED芯片上，使得UV LED芯片所发出的紫光透射过三色磷光质材料混合物。
即，下表1到3中所给出的每一种红、蓝、绿色磷光质混合物被涂敷在UV LED芯片上，使得UV LED芯片所发出的405nm紫光透射过三色磷光质材料混合物。
如表1到3中给出的彩色坐标和图3中给出的光致发光光谱中所示，确认了白光的产生。
表1
红色磷光质 绿色磷光质 蓝色磷光质     混合比例   彩色坐标
    (R∶G∶B)   (x，y)
Sr3SiO5:Eu SrGa2S4:Eu    Sr3MgSi2O8:Eu     1∶1∶1   0.31，0.30
   Ba3MgSi2O8:Eu     1∶1∶1   0.30，0.29
   SrS:Ce     1∶1∶2   0.41，0.39
   CaS:Ce     1∶1∶2   0.40，0.42
   CaAl2S4:Eu     1∶1∶3   0.41，0.41
BaGa2S4:Eu    Sr3MgSi2O8:Eu     1∶1∶1   0.33，0.30
   Ba3MgSi2O8:Eu     1∶1∶1   0.33，0.29
   SrS:Ce     1∶1∶2   0.42，0.40
   CaS:Ce     1∶1∶2   0.42，0.41
   CaAl2S4:Eu     1∶1∶3   0.41，0.42
CaGa2S4:Eu    Sr3MgSi2O8:Eu     1∶1∶1   0.40，0.30
   Ba3MgSi2O8:Eu     1∶1∶1   0.41，0.29
   SrS:Ce     1∶1∶2   0.40，0.37
   CaS:Ce     1∶1∶2   0.41，0.35
   CaAl2S4:Eu     1∶1∶3   0.42，0.40
Sr2Ga2S5:Eu    Sr3MgSi2O8:Eu     1∶2∶1   0.29，0.29
   Ba3MgSi2O8:Eu     1∶2∶1   0.29，0.31
   SrS:Ce     1∶2∶2   0.35，0.28
   CaS:Ce     1∶2∶2   0.34，0.27
   CaAl2S4:Eu     1∶2∶3   0.36，0.29
SrAl2S4:Eu    Sr3MgSi2O8:Eu     1∶2∶1   0.31，0.29
   Ba3MgSi2O8:Eu     1∶2∶1   0.31，0.31
   SrS:Ce     1∶2∶2   0.37，0.35
   CaS:Ce     1∶2∶2   0.38，0.38
   CaAl2S4:Eu     1∶2∶3   0.40，0.35
BaAl2S4:Eu    Sr3MgSi2O8:Eu     1∶2∶1   0.30，0.33
   Ba3MgSi2O8:Eu     1∶2∶1   0.31，0.32
   SrS:Ce     1∶2∶2   0.36，0.38
   CaS:Ce     1∶2∶2   0.38，0.37
   CaAl2S4:Eu     1∶2∶3   0.39，0.35
Sr2Al2S5:Eu    Sr3MgSi2O8:Eu     1∶2∶1   0.31，0.29
   Ba3MgSi2O8:Eu     1∶2∶1   0.31，0.29
   SrS:Ce     1∶2∶2   0.36，0.35
   CaS:Ce     1∶2∶2   0.39，0.38
   CaAl2S4:Eu     1∶2∶3   0.39，0.36
Sr2SiO4:Eu    Sr3MgSi2O8:Eu     1∶1∶1   0.30，0.30
   Ba3MgSi2O8:Eu     1∶1∶1   0.31，0.30
   SrS:Ce     1∶1∶2   0.37，0.34
   CaS:Ce     1∶1∶2   0.38，0.34
   CaAl2S4:Eu     1∶1∶3   0.39，0.35
Ba2SiO4:Eu    Sr3MgSi2O8:Eu     1∶1∶1   0.30，0.31
   Ba3MgSi2O8:Eu     1∶1∶1   0.31，0.31
   SrS:Ce     1∶1∶2   0.36，0.32
   CaS:Ce     1∶1∶2   0.35，0.31
   CaAl2S4:Eu     1∶1∶3   0.37，0.32
表2
红色磷光质 绿色磷光质 蓝色磷光质     混合比例     彩色坐标
    (R∶G∶B)     (x，y)
SrS:Eu SrGa2S4:Eu   Sr3MgSi2O8:Eu     1.5∶1∶1     0.30，0.31
  Ba3MgSi2O8:Eu     1.5∶1∶1     0.31，0.31
  SrS:Ce     1.5∶1∶2     0.36，0.31
  CaS:Ce     1.5∶1∶2     0.38，0.33
  CaAl2S4:Eu     1.5∶1∶3     0.40，0.35
BaGa2S4:Eu   Sr3MgSi2O8:Eu     1.5∶1∶1     0.29，0.31
  Ba3MgSi2O8:Eu     1.5∶1∶1     0.30，0.31
  SrS:Ce     1.5∶1∶2     0.35，0.32
  CaS:Ce     1.5∶1∶2     0.37，0.34
  CaAl2S4:Eu     1.5∶1∶3     0.39，0.37
CaGa2S4:Eu   Sr3MgSi2O8:Eu     1.5∶1∶1     0.33，0.33
  Ba3MgSi2O8:Eu     1.5∶1∶1     0.33，0.30
  SrS:Ce     1.5∶1∶2     0.38，0.33
  CaS:Ce     1.5∶1∶2     0.39，0.35
  CaAl2S4:Eu     1.5∶1∶3     0.38，0.37
Sr2Ga2S5:Eu   Sr3MgSi2O8:Eu     1.5∶2∶1     0.32，0.32
  Ba3MgSi2O8:Eu     1.5∶2∶1     0.33，0.32
  SrS:Ce     1.5∶2∶2     0.31，0.36
  CaS:Ce     1.5∶2∶2     0.33，0.38
  CaAl2S4:Eu     1.5∶2∶3     0.34，0.38
SrAl2S4:Eu   Sr3MgSi2O8:Eu     1.5∶2∶1     0.27，0.25
  Ba3MgSi2O8:Eu     1.5∶2∶1     0.30，0.25
  SrS:Ce     1.5∶2∶2     0.35，0.30
  CaS:Ce     1.5∶2∶2     0.36，0.32
  CaAl2S4:Eu     1.5∶2∶3     0.38，0.35
BaAl2S4:Eu   Sr3MgSi2O8:Eu     1.5∶2∶1     0.25，0.24
  Ba3MgSi2O8:Eu     1.5∶2∶1     0.23，0.24
  SrS:Ce     1.5∶2∶2     0.41，0.37
  CaS:Ce     1.5∶2∶2     0.40，0.38
  CaAl2S4:Eu     1.5∶2∶3     0.42，0.39
Sr2Al2S5:Eu   Sr3MgSi2O8:Eu     1.5∶2∶1     0.28，0.26
  Ba3MgSi2O8:Eu     1.5∶2∶1     0.30，0.27
  SrS:Ce     1.5∶2∶2     0.35，0.30
  CaS:Ce     1.5∶2∶2     0.40，0.37
  CaAl2S4:Eu     1.5∶2∶3     0.39，0.41
Sr2SiO4:Eu   Sr3MgSi2O8:Eu     1.5∶1∶1     0.31，0.32
  Ba3MgSi2O8:Eu     1.5∶1∶1     0.30，0.30
  SrS:Ce     1.5∶1∶2     0.31，0.38
  CaS:Ce     1.5∶1∶2     0.34，0.37
  CaAl2S4:Eu     1.5∶1∶3     0.35，0.40
Ba2SiO4:Eu   Sr3MgSi2O8:Eu     1.5∶1∶1     0.33，0.31
  Ba3MgSi2O8:Eu     1.5∶1∶1     0.31，0.29
  SrS:Ce     1.5∶1∶2     0.35，0.38
  CaS:Ce     1.5∶1∶2     0.37，0.40
  CaAl2S4:Eu     1.5∶1∶3     0.37，0.39
表3
红色磷光质 绿色磷光质 蓝色磷光质     混合比例     彩色坐标
    (R∶G∶B)     (x，y)
SrY2S4:Eu SrGa2S4:Eu    Sr3MgSi2O8:Eu     2∶1∶1     0.29，0.33
   Ba3MgSi2O8:Eu     2∶1∶1     0.27，0.33
   SrS:Ce     2∶1∶2     0.34，0.37
   CaS:Ce     2∶1∶2     0.35，0.38
   CaAl2S4:Eu     2∶1∶3     0.37，0.35
BaGa2S4:Eu    Sr3MgSi2O8:Eu     2∶1∶1     0.30，0.30
   Ba3MgSi2O8:Eu     2∶1∶1     0.31，0.30
   SrS:Ce     2∶1∶2     0.36，0.35
   CaS:Ce     2∶1∶2     0.38，0.36
   CaAl2S4:Eu     2∶1∶3     0.40，0.35
CaGa2S4:Eu    Sr3MgSi2O8:Eu     2∶1∶1     0.38，0.32
   Ba3MgSi2O8:Eu     2∶1∶1     0.36，0.34
   SrS:Ce     2∶1∶2     0.38，0.40
   CaS:Ce     2∶1∶2     0.38，0.41
   CaAl2S4:Eu     2∶1∶3     0.40，0.43
Sr2Ga2S5:Eu    Sr3MgSi2O8:Eu     2∶2∶1     0.33，0.31
   Ba3MgSi2O8:Eu     2∶2∶1     0.34，0.32
   SrS:Ce     2∶2∶2     0.40，0.37
   CaS:Ce     2∶2∶2     0.40，0.39
   CaAl2S4:Eu     2∶2∶3     0.42，0.41
SrAl2S4:Eu    Sr3MgSi2O8:Eu     2∶2∶1     0.28，0.25
   Ba3MgSi2O8:Eu     2∶2∶1     0.30，0.29
   SrS:Ce     2∶2∶2     0.35，0.30
   CaS:Ce     2∶2∶2     0.37，0.35
   CaAl2S4:Eu     2∶2∶3     0.40，0.36
BaAl2S4:Eu    Sr3MgSi2O8:Eu     2∶2∶1     0.30，0.34
   Ba3MgSi2O8:Eu     2∶2∶1     0.31，0.30
   SrS:Ce     2∶2∶2     0.36，0.33
   CaS:Ce     2∶2∶2     0.37，0.37
   CaAl2S4:Eu     2∶2∶3     0.41，0.39
Sr2Al2S5:Eu    Sr3MgSi2O8:Eu     2∶2∶1     0.29，0.27
   Ba3MgSi2O8:Eu     2∶2∶1     0.30，0.29
   SrS:Ce     2∶2∶2     0.33，0.33
   CaS:Ce     2∶2∶2     0.36，0.37
   CaAl2S4:Eu     2∶2∶3     0.41，0.38
Sr2SiO4:Eu    Sr3MgSi2O8:Eu     2∶1∶1     0.29，0.32
   Ba3MgSi2O8:Eu     2∶1∶1     0.31，0.32
   SrS:Ce     2∶1∶2     0.33，0.37
   CaS:Ce     2∶1∶2     0.33，0.38
   CaAl2S4:Eu     2∶1∶3     0.37，0.40
Ba2SiO4:Eu    Sr3MgSi2O8:Eu     2∶1∶1     0.33，0.32
   Ba3MgSi2O8:Eu     2∶1∶1     0.31，0.33
   SrS:Ce     2∶1∶2     0.35，0.38
   CaS:Ce     2∶1∶2     0.38，0.39
   CaAl2S4:Eu     2∶1∶3     0.40，0.39
实例2：使用红色和绿色磷光质混合物制备白色发光二极管
用Ag膏将蓝光LED芯片安装到封装衬底的底座或引线框架上。接着，接着，红、绿双色磷光质材料混合物被直接或间接地涂敷在蓝光LED芯片上，使得蓝光LED芯片所发出的蓝光透射过双色磷光质材料混合物。
即，下表4中所给出的每一种红、蓝、绿色磷光质混合物被涂敷在蓝光LED芯片上，使得蓝光LED芯片所发出的465nm蓝光透射过双色磷光质材料混合物。
如表4中给出的彩色坐标和图4中给出的光致发光光谱中所示，确认了白光的产生。
表4
红色磷光质 绿色磷光质     混合比例     彩色坐标
    (R∶G)     (x，y)
Sr3SiO5:Eu   SrGa2S4:Eu     1∶1     0.33，0.32
  CaGa2S4:Eu     1∶1     0.35，0.37
  Sr2Ga2S5:Eu     1∶2     0.32，0.27
  Sr2SiO4:Eu     1∶2     0.32，0.32
  Ba2SiO4:Eu     1∶3     0.31，0.33
SrS:Eu   SrGa2S4:Eu     1∶1     0.30，0.31
  CaGa2S4:Eu     1∶1     0.40，0.35
  Sr2Ga2S5:Eu     1∶2     0.38，0.34
  Sr2SiO4:Eu     1∶1.5     0.31，0.32
  Ba2SiO4:Eu     1∶1.5     0.29，0.33
CaS:Eu   SrGa2S4:Eu     1∶1     0.30，0.31
  CaGa2S4:Eu     1∶1     0.35，0.34
  Sr2Ga2S5:Eu     1∶2     0.33，0.37
  Sr2SiO4:Eu     1∶1.5     0.33，0.32
  Ba2SiO4:Eu     1∶1.5     0.31，0.31
SrY2S4:Eu   SrGa2S4:Eu     2∶1     0.31，0.34
  CaGa2S4:Eu     2∶1     0.35，0.35
  Sr2Ga2S5:Eu     1∶1     0.30，0.32
  Sr2SiO4:Eu     2∶1.5     0.31，0.31
  Ba2SiO4:Eu     2∶1.5     0.29，0.30
工业实用性
从上述说明可见，本发明的白色发光二极管可以使用高效率UV或者蓝光LED芯片以及两种或多种颜色的磷光质材料混合物得到白光，使用单芯片提供最佳的光致发光效率。
本领域技术人员可以理解，上述说明中所提出的概念和具体实施方案可以可靠地被用作修改的基础或设计实现与本发明的目的相同的其它实施方案的基础。本领域技术人员也可以理解，这样的等价实施方案没有脱离所附权利要求中提出的本发明的精神和范围。

Claims (11)

1.一种用于制备白色发光二极管的方法，该白色发光二极管包括利用Ag膏附着在封装衬底的底座或者引线框架上的UV LED芯片、连接引线框架电极与UV LED芯片的Au线、以及密封和保护LED芯片和Au线的透明树脂，
其中，红、蓝、绿三色磷光质材料混合物被直接或间接地涂敷在UV LED芯片上，使得当UV LED芯片所发出的紫光穿过三色磷光质材料混合物时获得白光。
2.一种用于制备白色发光二极管的方法，该白色发光二极管包括利用Ag膏附着在封装衬底的底座或者引线框架上的蓝色LED芯片、连接引线框架电极与LED芯片的Au线、以及密封和保护LED芯片和Au线的透明树脂，
其中红、绿或者黄、红双色磷光质材料混合物被直接或间接地涂敷在蓝光LED芯片上，使得当蓝光LED芯片所发出的蓝光穿过双色磷光质材料混合物时可以获得白光。
3.根据权利要求1或2所述的用于制备白色发光二极管的方法，其中，UV LED芯片中所发出的光或者蓝光LED芯片中所发出的光的波长范围为365到480nm。
4.根据权利要求1或2所述的用于制备白色发光二极管的方法，其中，红色磷光质材料选自以下至少一种材料：基于硅酸盐的Sr3SiO5:Eu磷光质；基于硫化物的磷光质，其中Eu被用作活性剂并且基质的分子式为(Srx，Cay)S，其中0≤x≤1并且0≤y≤1，典型地是SrS:Eu或CaS:Eu；以及SrY2S4:Eu磷光质。
5.根据权利要求1或2所述的用于制备白色发光二极管的方法，其中，绿色磷光质材料选自以下至少一种材料：分子式为(Srx，Bay，Caz)2SiO4:Eu的基于硅酸盐的磷光质，其中0≤x≤1，0≤y≤1并且0≤z≤1，典型地是Sr2SiO4:Eu、Ba2SiO4:Eu或者Ca2SiO4:Eu；基于硫代镓酸盐的磷光质，其中Eu被用作活性剂并且基质的分子式为(Srx，Bay，Caz)Ga2S4，其中0≤x≤1，0≤y≤1并且0≤z≤1，典型地是SrGa2S4:Eu、BaGa2S4:Eu、CaGa2S4:Eu或者Sr2Ga2S5:Eu；以及分子式为(Srx，Bay，Caz)Al2S4的基于硫代铝酸盐的磷光质，其中0≤x≤1，0≤y≤1并且0≤z≤1，典型地是SrAl2S4:Eu、BaAl2S4:Eu或者Sr2Al2S5:Eu。
6.根据权利要求1或2所述的用于制备白色发光二极管的方法，其中，蓝色磷光质材料选自以下至少一种材料：分子式为(Srx，Bay，Caz)3MgSi2O8:Eu的基于硅酸盐的磷光质，其中0≤x≤1，0≤y≤1并且0≤z≤1，典型地是Sr3MgSi2O8:Eu或者Ba3MgSi2O8:Eu；基于硫化物的磷光质其中Ce被用作活性剂并且基质分子式为(Srx，Cay)S，其中0≤x≤1并且0≤y≤1，典型地是SrS:Ce或CaS:Ce；以及CaAl2S4:Eu磷光质。
7.根据权利要求1所述的用于制备白色发光二极管的方法，其中，红色磷光质材料、绿色磷光质材料和蓝色磷光质材料按1-2∶1-2∶1-3的比例混合。
8.根据权利要求2所述的用于制备白色发光二极管的方法，其中，红色磷光质材料和绿色磷光质材料按1-2∶1-2的比例混合。
9.一种发光器件，包括按权利要求1或2中所述方法制备的白色发光二极管。
10.一种显示装置，包括按权利要求1或2中所述方法制备的白色发光二极管。
11.一种背光装置，包括按权利要求1或2中所述方法制备的白色发光二极管。
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