CN1201813A - 一种具有改进发光效率的磷光体及其制备方法 - Google Patents

一种具有改进发光效率的磷光体及其制备方法 Download PDF

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CN1201813A
CN1201813A CN97123290A CN97123290A CN1201813A CN 1201813 A CN1201813 A CN 1201813A CN 97123290 A CN97123290 A CN 97123290A CN 97123290 A CN97123290 A CN 97123290A CN 1201813 A CN1201813 A CN 1201813A
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phosphorescent substance
metal
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salt
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刘一
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Samsung SDI Co Ltd
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Abstract

由一种基质以及分布于基质表面上的金属盐或金属氧化物构成的一种低压显示装置磷光体具有改进的发光效率,并能在相对较低的温度下生产。

Description

一种具有改进发光效率 的磷光体及其制备方法
本发明涉及一种磷光体(phosphor)，特别是一种具有改进发光效率的磷光体，以及通过在基质表面均匀分散活化剂制备该磷光体的方法。
一般地讲，FEDs(场发射显示屏)，VFDs(真空荧光显示屏)等均被用作低压显示屏装置，其中采用小于一千伏特的激发电压来激发显示屏装置。FED做为一种小型哑色显示屏装置已被广泛研究，VFD被用于各种家用电器的面板显示装置，例如用于电视机，录相机等，此外还可用于汽车面板显示装置。在低压显示装置中，电子束从例如热线的电子发射器中发射出来，激活显示装置屏幕上的磷光体，以在其上产生图形画面。
传统上，磷光体包括一种基质做为其主要成份，和一种活化剂。ZnS，(ZnCd)S，Y2O3或Y2O2S一般用作基质，各种金属可用作活化剂。当ZnS做为基质时，活化剂在900-1000℃下通过热扩散方法掺杂入基质中。同样，当Y2O3做基质时，活化剂通过1200-1300℃高温掺杂入基质。然后，将上述各传统方法制备的磷光体活化剂均匀分散于附图1中所示的基质中，这样，只有当高能电子束辐射到高压显示装置，例如阴极射线管，上的磷光体时，磷光体中的所有活化剂才会影响到磷光体的发光效果。
但是，在低压显示装置中，从热线中发射出的电子束对磷光体仅具有距基质表面几A(埃)的穿透力。因此，只有分布在磷光体周围的活化剂才会影响磷光体的发光效率。所以，低压显示装置中磷光体的发光效率很大程度上依赖于磷光体表面的活化剂。因此，在制备低压显示装置磷光体的具体实施方案中，如果活化剂通过传统的热扩散方法掺杂入基质，则由于活化剂的分散缘故，磷光体将不能有效地发光。此外，为使活化剂在基质中扩散和结晶，活化剂需加热至900-1300℃，这样可能会增加磷光体的生产成本。
为解决上述问题，本发明提供了一种具有改进发光效率的磷光体以及在较低温度下制备此种磷光体的方法。本发明的其它目的，优点和显著特性，对于本领域熟练技术人员而言，在理解下述详细描述后将是显而易见的，或通过本发明的实践可学到。为达上述目的，本发明提供了一种低压显示装置磷光体的加工方法，该方法包括将金属盐或金属氧化物涂布到基质上，和通过在400-800℃下对基质的热处理将金属盐或金属氧化物掺杂入基质的步骤。此外，本发明还提供一种低压显示装置磷光体，包括一种基质和分布在基质表面上的金属盐或金属氧化物。
                     附图简要说明
附图1为传统磷光体发光的横截面，它显示活化剂均匀分布于磷光体中，和
附图2为本发明一实施方案中的一种低压显示装置磷光体的横截面，它显示了活化剂在磷光体中的分布。
在以下的详细描述中，仅说明和阐述本发明的优选实施方案，简要表述实施发明者熟思的本发明的最佳方案。应该理解到，本发明在各个不同的方面均可改进，但均不背离本发明的范围。所以，以下描述仅是本发明的解释，而非对本发明的限制。
本发明提供一种低压显示装置磷光体的制备方法，该方法包括将金属盐或金属氧化物涂布于基质上，和通过400-800℃下对基质的热处理将金属盐或金属氧化物掺杂入基质中的步骤。此外，本发明还提供了一种低压显示装置磷光体，包括一种基质和分布于基质表面上的金属盐或金属氧化物。
优选金属选自锰(Mn)，铜(Cu)，金(Au)，银(Ag)，铕(Eu)，钐(Sm)，镝(Dy)，铈(Ce)，铽(Tb)等及其混合物。涂布操作优选在水溶液或醇溶液存在的条件下进行。Mn、Cu、Au、Ag、Eu、Sm、Dy、Ce、Tb的金属盐或金属氧化物或它们的混合物，做为活化剂，在水溶液或醇溶液存在的条件下涂布于基质，如ZnS，(ZnCd)S，Y2O3或Y2O3S，的表面上。涂布的活化剂通过400-800℃下对基质的热处理掺杂入和扩散于基质中。如果热处理温度低于400℃，磷化物将不能正常发光。如果热处理温度高于800℃，活化剂将分布于基质的中心，同时热处理也将导致成本不必要的增加。
以下描述的是一些优选实施例和参考实施例。这些实施例仅是示范性的，本发明不限于实施例的范围。
实施例1
纯水做溶剂，粉状ZnS做基质材料，锰盐的水溶液做活化剂，在250毫升的烧杯中将上述材料混合，把锰盐涂布于基质ZnS的表面。于500℃下加热处理1小时，将涂布后的活化剂扩散和掺杂入基质之中。制成低压显示装置磷光体。磷光体中锰盐的重量百分比为1％。
实施例2
纯水做溶剂，粉状Y2O3做基质材料，锰盐的水溶液做活化剂，在250毫升烧杯中将上述材料混合，把锰盐涂布于Y2O3基质表面上。于500℃下加热处理1小时，将涂布后的活化剂扩散和掺杂入基质之中。制成低压显示装置磷光体。磷光体中锰盐的重量百分比为1％。
参考实施例1
ZnS粉末做为基质材料与锰盐混合，把锰盐涂布于基质上。涂布后的基质于900℃下加热2小时，把锰盐掺杂入基质中。磷光体中锰盐重量百分比为1％。
参考实施例2
Y2O3粉末做为基质材料与锰盐混合，把锰盐涂布于基质上。涂布后的基质于1250℃下加热2小时，把锰盐掺杂入基质中。磷光体中锰盐重量百分比为1％。
以上各实施例中的磷光体的发光效率列于表1
                           表1
  磷光体材料   掺杂温度(℃) 发光效率(％)
实施例1     ZnS     500     110
实施例2     Y2O3     500     105
参考实施例1     ZnS     900     100
参考实施例2     Y2O3     1250     100
表1表明，尽管以上各实施例的生产温度相对较低，实施例1和实施例2的发光效率仍比参考实施例高出5％到10％。
在此公开内容中，仅显示和描述了本发明的优选实施方案，但正如前述，本发明能应用于其它各种组合方案和环境中，也能在本文表述的发明精神范围内的进行任何改变或改进。

Claims (5)

1.一种低压显示装置磷光体的制备方法，包括以下步骤：
将一种金属盐或金属氧化物涂布于基质上；和
于400-800℃的温度下通过加热基质将金属盐或金属氧化物掺杂入基质中。
2.权利要求1的方法，其中所述金属选自Mn、Cu、Au、Ag、Eu、Sm、Dy、Ce、Tb及其混合物。
3.权利要求1的方法，其中的涂布步骤在水溶液或醇溶液中进行。
4.一种低压显示装置磷光体，磷光体包含：
一种基质；和
分布于所述基质表面的金属盐或金属氧化物。
5.权利要求4的磷光体，其中所述金属选自Mn、Cu、Au、Ag、Eu、Sm、Dy、Ce、Tb及其混合物。
CN97123290A 1997-06-05 1997-12-26 一种具有改进发光效率的磷光体及其制备方法 Pending CN1201813A (zh)

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CN104157797B (zh) * 2014-08-07 2016-08-24 京东方科技集团股份有限公司 一种制备有机发光器件的方法

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