CN100426072C - 磷光体混合物和用于液晶显示器的背光源 - Google Patents

磷光体混合物和用于液晶显示器的背光源 Download PDF

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CN100426072C
CN100426072C CNB031587720A CN03158772A CN100426072C CN 100426072 C CN100426072 C CN 100426072C CN B031587720 A CNB031587720 A CN B031587720A CN 03158772 A CN03158772 A CN 03158772A CN 100426072 C CN100426072 C CN 100426072C
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阿纳尼·A·塞特卢尔
阿洛克·M·斯里瓦斯塔瓦
霍利·A·科曼佐
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Abstract

包括至少一个分别在可见光谱的蓝色、绿色和红色区域中发光的磷光体的磷光体组合物邻近彩色液晶显示器的背光源放置。该磷光体组合物在该显示器中使用的滤色片的波长范围内强烈发光。背光源包括半导体发光二极管或有机发光器件。

Description

磷光体混合物和用于液晶显示器的背光源
本发明是根据美国标准技术协会(United States National Institute ofStandard and Technology)授予的合同70NANN8H4022中规定的内容首先构思或付诸实施的。美国对本发明享有某些权利。
背景技术
一般来说，本发明涉及液晶显示器(“LCD”)及其背光源(backlightsources)。具体来说，本发明涉及用于改善彩色LCD背光的磷光体混合物。
在电子工业中，LCD广泛地用在从移动电话、计算器和手表至计算机和汽车中的信息显示器的产品中。与具有竞争力的显示器技术相比，LCD在诸如大小、成本、设计、灵活性、可靠性和能耗这些方面具有多种优点。对于电子器件的设计师来说，这些优点使LCD成为很受欢迎的选择。
液晶材料的特征在于：对该材料施加电场可以改变透过液晶薄层的光。这一性能应用于LCD。
LCD的主要部分由包含在两个由如玻璃或有机聚合物的材料制成的透明板之间的薄层液晶材料组成。透明板的内表面上设置有定义了要显示的图案、字符或图像的透明电极。透明板的外表面上设置有偏光透镜。当通过一对对应电极施加电压时，光线被阻塞或允许通过该组件，这取决于偏光透镜(polarizing lenses)的相对取向。两个电极的叠加位置定义了显示器的像素。这种显示器称为无源矩阵(passive matrix)显示器。在有源矩阵(active matrix)显示器中，薄膜晶体管(TFT)的矩阵置于一个透明板上作为开关元件(switching elements)。在第二个透明板上设置一个普通电极。当寻址特定TFT以将其开启时，TFT和普通电极之间的液晶材料展开，允许光线通过。为了控制像素的亮度，可以为TFT供应精确控制的电压。红色、绿色和蓝色滤色片(color filter)置于相邻的像素处，当用受控的电压值激活选择的TFT时，每一组三个TFT产生不同的色调和颜色。
对于高亮度的显示器设备来说，在相对于观察者的透明板背后设置背光源。小型荧光灯或多个发光二极管(″LED″)一般用于此目的。这种发射广谱的光源和滤色片耦合，允许特定颜色的光透过像素。美国专利5982092中公开的一种发白光的背光系统由和发黄光的Y3Al5O12:Ce磷光体耦合的发射蓝光或波长范围为360-380nm的紫外线(″UV″)辐射的半导体LED组成。但是，如图1所示，因为Y3Al5O12:Ce的发射光谱不能集中在一般使用的特定于滤色片的波长范围内(约440-460nm，约550-570nm，约630-680nm)，所以该系统是不节能的。
因此，目前一直需要更节能(energy-efficient)的用于LCD的背光系统。还非常需要能够改善彩色LCD的磷光体混合物。
发明内容
本发明提供用于LCD中的背光源的磷光体组合物。该磷光体组合物通过更强烈地发射一般蓝色、绿色和红色滤色片的波长范围内的可见光改善能量的利用。术语″光″和″电磁辐射″在本申请中可以交互使用，其表示波长范围为约200nm至约770nm的电磁辐射。
本发明的磷光体组合物包括至少一种发蓝光的磷光体、至少一种发绿光的磷光体和至少一种发红光的磷光体。发蓝光的磷光体选自(Sr，Ca，Ba，Mg)10(PO4)6(F，Cl，Br，OH):Eu2+(下面也称为″SECA″)；(Ba，Sr，Ca)MgAl10O17:Eu2+(下面也称为″BAM″)；(Sr，Ca)10(PO4)6·nB2O3:Eu2+，其中，0＜n＜1；2SrO·0.84P2O5·0.16B2O3:Eu2+；Sr2Si3O8·2SrCl2:Eu2+；Ba3MgSi2O8:Eu2+；Sr4Al14O25:Eu2+(下面也称为″SAE″)；BaAl8O13:Eu2+；及其混合物。发绿光的磷光体选自(Ba，Sr，Ca)MgAl10O17:Eu2+，Mn2+(下面也称为″BAMn″)；(Ba，Sr，Ca)Al2O4:Eu2+；(Y，Gd，Lu，Sc，La)BO3:Ce3+，Tb3+；(Ba，Sr，Ca)2SiO4:Eu2+；(Ba，Sr，Ca)2(Mg，Zn)Si2O7:Eu2+；(Sr，Ca，Ba)(Al，Ga，In)2S4:Eu2+；(Y，Gd，Tb，La，Sm，Pr，Lu)x(Al，Ga，In)yO12:Ce3+，其中，x是约2.8至3且包括3，y是约4.9至约5.1；(Sr，Ca，Ba，Mg，Zn)2P2O7:Eu2+，Mn2+(下面也称为″SPP″)；(Ca，Sr，Ba，Mg)10(PO4)6(F，Cl，Br，OH):Eu2+，Mn2+(下面也称为″HALO″)；(Ca，Sr，Ba)8(Mg，Zn)(SiO4)4(Cl，F)2:Eu2+，Mn2+(下面也称为″CASI″)；及其混合物。发红光的磷光体选自(Gd，Y，Lu，La)2O3:Eu3+，Bi3+；(Gd，Y，Lu，La)2O2S:Eu3+，Bi3+；(Gd，Y，Lu，La)VO4:Eu3+，Bi3+；SrS:Eu2+；SrY2S4:Eu2+；CaLa2S4:Ce3+；(Ca，Sr)S:Eu2+；3.5MgO·0.5MgF2·GeO2:Mn4+(下面也称为″MFG″)；(Ba，Sr，Ca)MgP2O7:Eu2+，Mn2+；及其混合物。
在本发明的一个方面中，LCD包括背光源，背光源包括至少一个发射波长范围至少为约300nm至约450nm的光的光源和包括至少一种发蓝光的磷光体、至少一种发绿光的磷光体和至少一种发红光的磷光体的光转换磷光体组合物(light-conversion phosphor composition)。设置磷光体组合物，以接收光源发射的电磁辐射并发射可见光。
在本发明的另一个方面中，磷光体组合物置于光源和LCD的液晶材料层之间。
详细阅读下面本发明的详述部分和附图，本发明的其它特征和优点将更为明显，在附图中，相同的数字表示相同的元件。
附图说明
图1是美国专利5982092中公开的现有技术LCD背光中所用的类型的Y3Al5O12:Ce3+磷光体的发射光谱。
图2示出由(Sr0.79Eu0.1Mn0.1Mg0.11)2P2O7、SECA和MFG组成的磷光体混合物的发射光谱。
图3示出由CASI、SECA和MFG组成的磷光体混合物的发射光谱。
图4示出使用包括LED和本发明的光转换层的背光系统的LCD的透视分离部件。
图5示出使用包括有机场致发光器件和本发明的光转换层的背光系统的LCD的透视分离部件。
具体实施方式
本发明提供用于LCD中的背光源的磷光体组合物。
本发明的磷光体组合物包括至少一种发蓝光的磷光体、至少一种发绿光的磷光体和至少一种发红光的磷光体。发蓝光的磷光体选自(Sr，Ca，Ba，Mg)10(PO4)6(F，Cl，Br，OH):Eu2+；(Ba，Sr，Ca)MgAl10O17:Eu2+；(Sr，Ca)10(PO4)6·nB2O3:Eu2+，其中，0＜n＜1；2SrO·0.84P2O5·0.16B2O3:Eu2+；Sr2Si3O8·2SrCl2:Eu2+；Ba3MgSi2O8:Eu2+；Sr4Al14O25:Eu2+；BaAl8O13:Eu2+；及其混合物。发绿光的磷光体选自(Ba，Sr，Ca)MgAl10O17:Eu2+，Mn2+；(Ba，Sr，Ca)Al2O4:Eu2+；(Y，Gd，Lu，Sc，La)BO3:Ce3+，Tb3+；(Ba，Sr，Ca)2SiO4:Eu2+；(Ba，Sr，Ca)2(Mg，Zn)Si2O7:Eu2+；(Sr，Ca，Ba)(Al，Ga，In)2S4:Eu2+；(Y，Gd，Tb，La，Sm，Pr，Lu)x(Al，Ga，In)yO12:Ce3+，其中，x是约2.8至3且包括3，y是约4.9至约5.1；(Sr，Ca，Ba，Mg，Zn)2P2O7:Eu2+，Mn2+；(Ca，Sr，Ba，Mg)10(PO4)6(F，Cl，Br，OH):Eu2+，Mn2+；(Ca，Sr，Ba)8(Mg，Zn)(SiO4)4(Cl，F)2:Eu2+，Mn2+；及其混合物。发红光的磷光体选自(Gd，Y，Lu，La)2O3:Eu3+，Bi3+；(Gd，Y，Lu，La)2O2S:Eu3+，Bi3+；(Gd，Y，Lu，La)VO4:Eu3+，Bi3+；SrS:Eu2+；SrY2S4:Eu2+；CaLa2S4:Ce3+；(Ca，Sr)S:Eu2+；3.5MgO·0.5MgF2·GeO2:Mn4+；(Ba，Sr，Ca)MgP2O7:Eu2+，Mn2+；及其混合物。应当理解的是：上面公开的磷光体的化学组成可从所示的化学计量组成中轻微变化，因为磷光体主晶格(host lattice)能够容纳少量晶格缺陷。这样的磷光体在本发明的保护范围内。这些磷光体可被波长范围为约300nm至约450nm的电磁辐射激发，并能够在蓝色、绿色或红色可见区内有效发光。因此，这些选择的磷光体混合物可以与至少一个在波长范围为约300nm至约450nm内发光的LED有利地结合使用，为LCD提供背光源。
在本发明的一个方面中，选择磷光体混合物，使其复合发射光谱(composite emission spectrum)在特定于LCD中使用的滤色片(colorfilters)(如：蓝色、绿色和红色滤色片)的波长范围内具有高强度。例如，许多商业滤色片材料设计为通过波长为440-460nm(蓝色)、550-570nm(绿色)和630-680nm(红色)的光。
图2和3示出由(Sr0.79Eu0.1Mn0.1Mg0.11)2P2O7、SECA和MFG及由CASI、SECA和MFG组成的磷光体混合物和蓝色、绿色和红色滤色片的波长范围的发射光谱。用波长约为405nm的发蓝光的LED激发磷光体混合物。
可以用任何机械方法将本发明的磷光体混合物混合在一起，这些机械方法包括但不限定为在高速混合器或螺条搅拌器(ribbon blender)中的搅拌或混合。可以在球磨机、锤式粉碎机或喷射磨中将磷光体结合并一起粉碎。可以将磷光体颗粒的粒度减小到小于4微米，优选小于2微米。
磷光体混合物可以分散在基本透明的树脂中，光转换片由该混合物制成后固化，以放置在背光和液晶材料层之间。术语″基本透明″表示允许至少80％、优选至少90％、更优选至少95％的可见波长的光通过约1mm的厚度。适用于生产光转换片树脂的例子包括但不限定为丙烯酸酯树脂、环氧树脂、聚硅氧烷和聚硅氧烷官能化的环氧树脂。光转换片还可以包括粒度类似于磷光体混合物的粒度的散射材料如TiO2或Al2O3的颗粒。可以用任何合适的方法，如铸造、撒布、辊压、喷雾法在基片等上制成光转换片。
图4示出使用本发明一个实施方案的背光的LCD 10的透视分离部件。LED 20及其相关电路置于托盘25的侧壁22上。托盘25具有反射底表面24，用于向上反射LED 20发射的电磁辐射。在托盘25上放置包括分散在基本透明的树脂中的本发明的磷光体混合物颗粒的光转换片30。光转换片30中的磷光体颗粒接收并吸收LED 20发射且由表面24反射的电磁辐射，然后发射其强度集中在蓝色、绿色和红色区域内的可见波长的光。可以在托盘25和光转换层30之间放置光散射层(图中未示出)。光散射层一般在至少一个表面上具有凸起结构如凸起点或波形条。第一个偏光器(light polarizer)40放置在光转换层30上。液晶材料如扭曲向列液晶(twisted nematic liquid crystal)层55包含在两个透明板50和60之间。层55和板50和60的组件放置在第一个偏光器40上。透明板50和60的邻近液晶层55的表面负载构图的电极，当在电极之间施加电压时，这些电极将在液晶材料上形成像素矩阵。蓝色、绿色和红色滤色片设置在一个透明板上的像素位置处，以控制透过每一个像素的光色。第二个偏光器70放置在液晶组件上。另外，还可以包括其它任选层，如光漫射器(light diffuser)或保护层。
透明板50和60可以包括玻璃或透明塑料板或膜。塑料的非限定性例子是聚对苯二甲酸乙二醇酯(″PET″)、聚丙烯酸酯、聚碳酸酯、聚硅氧烷、环氧树脂、聚硅氧烷官能化的环氧树脂、聚酯、聚酰亚胺、聚醚酰亚胺、PES、PEN、聚降冰片烯(polynorbonenes)或聚(环烯烃)。为了防止来自环境中的活性化学物质不必要的漫射，在这些塑料板或膜的至少一个表面上涂覆漫射阻挡层是有利的，这些化学物质包括但不限定为氧气、水蒸汽、含硫化合物和酸性气体。漫射阻挡涂层(diffusion barrier coating)可以包括至少一种无机材料和至少一种有机材料相互交替的多层涂层。多层漫射阻挡涂层的无机材料一般选自金属(金属层的厚度选择为使该层基本透明)、金属碳化物、金属氧化物、金属氮化物、金属碳氧化物、金属氮氧化物和碳氮化物。可以用物理气相沉积、化学气相沉积、粒子束辅助沉积、溅射或等离子体增强的化学气相沉积将无机层沉积在塑料板或膜上。每一个无机层的厚度一般是约1nm至约500nm。多层漫射阻挡涂层的有机材料一般选自聚丙烯酸酯，如丙烯酸、甲基丙烯酸的聚合物或共聚物、这些酸的酯或丙烯腈；聚(氟乙烯)；聚(偏1，1-二氯乙烯)；聚(乙烯醇)；乙烯醇和乙二醛的共聚物；PET、聚对二甲苯基(parylene)和由环烯烃及其衍生物如美国专利4540763和5185391中公开的聚(芳基环丁烯)衍生的聚合物。有机层的厚度一般是约10nm至约10000nm、优选约10nm至约5000nm。
在用LED作为背光光源的一个实施方案中，基本透明的树脂、磷光体混合物和任选的散射材料的混合物形成光转换铸件，该铸件邻近每一个LED的半导体发光元件放置，以接收LED发射的光。
在图5所示的本发明的另一个实施方案中，为LCD 10提供背光的光源包括有机发光器件(″OELD″)80。这种OELD 80一般包括置于两个电极83和87之间的有机场致发光(″EL″)层85，当通过电极83和87施加电压时，有机EL材料能够发光。电极83和87与有机发光层85的组件还可以放置或形成在由玻璃或有机聚合物制成的基本透明的基片上。其中的一个电极，一般是阳极，由基本透明的导电氧化物如铟锡氧化物(″ITO″)、氧化锡、氧化铟、氧化锌、铟锌氧化物、镉锡氧化物或其混合物制成，并且置于有机发光层和液晶层之间，使来自有机发光层发射的光能够透射进入液晶层。有机EL材料的非限定性例子是聚合物、共聚物、聚合物的混合物和低分子量的有机分子，所有这些都有不饱和键。这些材料有离域π电子系统，这种离域π电子系统赋予聚合物链或有机分子以负载高迁移性的正和负载荷子的能力。合适的EL聚合物是聚(正乙烯基咔唑)(“PVK”，发射波长约为380-500nm的紫外线至蓝光)；聚(烷基芴)如聚(9，9-二己基芴)(410-550nm)、聚(二辛基芴)(EL发射的波长峰为436nm)或聚{9，9-双(3，6-二氧杂庚基)-芴-2，7-二基}(400-550nm)；聚(对亚苯基)衍生物如聚(2-癸基氧-1，4-亚苯基)(400-550nm)。可以用这些聚合物或基于一种或多种这些聚合物和其它聚合物的共聚物的混合物对发射的光调色。
另一类合适的EL聚合物是聚硅烷。聚硅烷是用各种烷基和/或芳基侧基取代的线性硅主链聚合物。它们是沿聚合物主链有离域σ共轭电子的准二维材料。聚硅烷的例子是聚(二正丁基硅烷)、聚(二正戊基硅烷)、聚(二正己基硅烷)、聚(甲基苯基硅烷)和聚{双(对丁基苯基)硅烷}，这些材料公开在H.Suzuki等人的“Near-Ultraviolet Electroluminescence From Polysilanes，”331Thin Solid Films 64-70(1998)中。这些聚硅烷发射波长是约320nm至约420nm的光。
也可以使用由大量芳香基单元制成的分子量小于约5000的有机材料。这样的材料的例子是发射波长范围为380-500nm的光的1，3，5-三{正-(4-二苯基氨基苯基)苯基氨}苯。还可以用低分子量的有机分子如苯基蒽、四芳基乙烯、香豆素、红荧烯(rubrene)、四苯基丁二烯、蒽、苝、晕苯(coronene)或其衍生物制备有机EL层。这些材料一般发射最大波长约为520nm的光。其它合适的材料还有低分子量的金属有机配合物，如发射波长范围为415-457nm的光的铝、镓和铟的乙酰丙酮化物，发射范围为420-433nm的(皮考基甲基酮)-双{2，6-二(叔丁基)苯氧化}铝或(4-甲氧基-皮考基甲基酮)-双(乙酰丙酮化)钪。
上述光转换片置于有机发光层和液晶层之间，将有机EL层发射的光转换成强度基本上集中在滤色片波长范围内的光。
虽然前面已经公开了本发明优选的具体实施方案，但是本领域普通技术人员应当理解：在不背离所附的权利要求书所定义的本发明的精神和保护范围的情况下，可以对本发明进行多种修改、替换或变动。

Claims (22)

1、 一种用于液晶显示器的背光源的磷光体组合物，该磷光体组合物包括发蓝光的磷光体、发绿光的磷光体和发红光的磷光体；其中，所说的发蓝光的磷光体选自(Ca，Ba，Mg)10(PO4)6(F，Cl，Br，OH):Eu2+；(Ba，Sr，Ca)MgAl10O17:Eu2+；(Sr，Ca)10(PO4)6·nB2O3:Eu2+，其中，0＜n＜1；2SrO·0.84P2O5·0.16B2O3:Eu2+；Sr2Si3O8·2SrCl2:Eu2+；Ba3MgSi2O8:Eu2+；Sr4Al14O25:Eu2+；BaAl8O13:Eu2+；及其混合物；所说的发绿光的磷光体选自(Ba，Sr，Ca)MgAl10O17:Eu2+，Mn2+；(Y，Gd，Lu，Sc，La)BO3:Ce3+，Tb3+；(Ba，Sr，Ca)2SiO4:Eu2+；(Ba，Sr，Ca)2(Mg，Zn)Si2O7:Eu2+；(Ca，Ba)(Al，Ga，In)2S4:Eu2+；(Sr，Ca，Ba，Mg，Zn)2P2O7:Eu2+，Mn2+；(Ca，Sr，Ba，Mg)10(PO4)6(F，Cl，Br，OH):Eu2+，Mn2+；(Ca，Sr，Ba)8(Mg，Zn)(SiO4)4(Cl，F)2:Eu2+，Mn2+；及其混合物；所说的发红光的磷光体选自(Gd，Y，Lu，La)2O3:Eu3+，Bi3+；(Gd，Y，Lu，La)2O2S:Eu3+，Bi3+；(Gd，Y，Lu，La)VO4:Eu3+，Bi3+；SrS:Eu2+；CaLa2S4:Ce3+；(Ca，Sr)S:Eu2+；(Ba，Sr，Ca)MgP2O7:Eu2+，Mn2+；及其混合物。
2、根据权利要求1的磷光体组合物，其中，所说的磷光体组合物吸收至少一部分所述背光源发射的第一光谱，并且发射不同于所述第一光谱的第二光谱的光。
3、根据权利要求2的磷光体组合物，其中，所说的第二光谱在440-460nm、550-570nm和630-680nm的波长区域内的强度比在可见光谱的另一区域内的强度高。
4、一种用于液晶显示器的背光系统，其包括：
发射的光的第一光谱范围至少在300nm至450nm的背光源；和
一种磷光体组合物，该磷光体组合物包括发蓝光的磷光体、发绿光的磷光体和发红光的磷光体；其中，所说的发蓝光的磷光体选自(Ca，Ba，Mg)10(PO4)6(F，Cl，Br，OH):Eu2+；(Ba，Sr，Ca)MgAl10O17:Eu2+；(Sr，Ca)10(PO4)6·nB2O3:Eu2+，其中，0＜n＜1；2SrO·0.84P2O5·0.16B2O3:Eu2+；Sr2Si3O8·2SrCl2:Eu2+；Ba3MgSi2O8:Eu2+；Sr4Al14O25:Eu2+；BaAl8O13:Eu2+；及其混合物；所说的发绿光的磷光体选自(Ba，Sr，Ca)MgAl10O17:Eu2+，Mn2+；(Y，Gd，Lu，Sc，La)BO3:Ce3+，Tb3+；(Ba，Sr，Ca)2SiO4:Eu2+；(Ba，Sr，Ca)2(Mg，Zn)Si2O7:Eu2+；(Ca，Ba)(Al，Ga，In)2S4:Eu2+；(Sr，Ca，Ba，Mg，Zn)2P2O7:Eu2+，Mn2+；(Ca，Sr，Ba，Mg)10(PO4)6(F，Cl，Br，OH):Eu2+，Mn2+；(Ca，Sr，Ba)8(Mg，Zn)(SiO4)4(Cl，F)2:Eu2+，Mn2+；及其混合物；所说的发红光的磷光体选自(Gd，Y，Lu，La)2O3:Eu3+，Bi3+；(Gd，Y，Lu，La)2O2S:Eu3+，Bi3+；(Gd，Y，Lu，La)VO4:Eu3+，Bi3+；SrS:Eu2+；CaLa2S4:Ce3+；(Ca，Sr)S:Eu2+；(Ba，Sr，Ca)MgP2O7:Eu2+，Mn2+；及其混合物；
其中，设置所说的磷光体组合物以吸收至少一部分所述第一光谱的光，并且发射不同于所述第一光谱的第二光谱的光。
5、根据权利要求4的背光系统，其中，所说的第二光谱在440-460nm、550-570nm和630-680nm的波长区域内的强度比在可见光谱的另一区域内的强度高。
6、根据权利要求4的背光系统，其中，所说的磷光体组合物分散在基本透明的树脂中形成混合物，所述的混合物形成光转换层，该光转换层放置在所述背光源和所述液晶显示器的液晶材料层之间。
7、根据权利要求6的背光系统，其中，所说的基本透明的树脂包括至少一种选自丙烯酸酯树脂、环氧树脂、聚硅氧烷和聚硅氧烷官能化的环氧树脂的材料。
8、根据权利要求6的背光系统，其中，所说的混合物还包括光散射材料的颗粒。
9、根据权利要求4的背光系统，其中，所说的背光源为发光二极管。
10、根据权利要求9的背光系统，其中，所说的混合物放置在所述发光二极管的发光元件上。
11、根据权利要求4的背光系统，其中，所说的背光源为有机场致发光器件。
12、根据权利要求11的背光系统，其中，所说的有机场致发光器件包括置于两个电极之间的有机发光层，当通过所述电极施加电压时，所述的有机发光层发光。
13、一种液晶显示器，其包括：
(a)一种背光系统，其包括：
(1)发射的光的第一光谱范围至少在300nm至450nm的背光源；和
(2)一种磷光体组合物，该磷光体组合物包括发蓝光的磷光体、发绿光的磷光体和发红光的磷光体；其中，所说的发蓝光的磷光体选自(Ca，Ba，Mg)10(PO4)6(F，Cl，Br，OH):Eu2+；(Ba，Sr，Ca)MgAl10O17:Eu2+；(Sr，Ca)10(PO4)6·nB2O3:Eu2+，其中，0＜n＜1；2SrO·0.84P2O5·0.16B2O3:Eu2+；Sr2Si3O8·2SrCl2:Eu2+；Ba3MgSi2O8:Eu2+；Sr4Al14O25:Eu2+；BaAl8O13:Eu2+；及其混合物；所说的发绿光的磷光体选自(Ba，Sr，Ca)MgAl10O17:Eu2+，Mn2+；(Y，Gd，Lu，Sc，La)BO3:Ce3+，Tb3+；(Ba，Sr，Ca)2SiO4:Eu2+；(Ba，Sr，Ca)2(Mg，Zn)Si2O7:Eu2+；(Ca，Ba)(Al，Ga，In)2S4:Eu2+；(Y，Gd，Tb，La，Sm，Pr，Lu)x(Al，Ga，In)yO12:Ce3+，其中，x是2.8至3且包括3，y是4.9至5.1；(Sr，Ca，Ba，Mg，Zn)2P2O7:Eu2+，Mn2+；(Ca，Sr，Ba，Mg)10(PO4)6(F，Cl，Br，OH):Eu2+，Mn2+；(Ca，Sr，Ba)8(Mg，Zn)(SiO4)4(Cl，F)2:Eu2+，Mn2+；及其混合物；所说的发红光的磷光体选自(Gd，Y，Lu，La)2O3:Eu3+，Bi3+；(Gd，Y，Lu，La)2O2S:Eu3+，Bi3+；(Gd，Y，Lu，La)VO4:Eu3+，Bi3+；SrS:Eu2+；CaLa2S4:Ce3+；(Ca，Sr)S:Eu2+；(Ba，Sr，Ca)MgP2O7:Eu2+，Mn2+；及其混合物；
其中，设置所说的磷光体组合物以吸收至少一部分所述第一光谱的光，并且发射不同于所述第一光谱的第二光谱的光；和
(b)设置用于接收具有所述第二光谱的光的液晶材料。
14、根据权利要求13的液晶显示器，其中，所说的液晶材料放置在第一个和第二个基本透明的一对板之间；每一个所述板的邻近所述液晶材料的表面负载电极，使得这两个电极的叠加区域定义了所述液晶显示器的多个像素；允许蓝光、绿光和红光通过所述液晶材料的滤色片设置在每三个相邻的像素上。
15、根据权利要求13的液晶显示器，其中，所说的第二光谱在440-460nm、550-570nm和630-680nm的波长区域内的强度比在可见光谱的另一区域内的强度高。
16、根据权利要求14的液晶显示器，其中，所说的磷光体组合物分散在基本透明的树脂中形成混合物，所述的混合物形成光转换层，该光转换层设置在所述背光源和所述液晶显示器的液晶材料层之间。
17、根据权利要求16的液晶显示器，其中，所说的基本透明的树脂包括至少一种选自丙烯酸酯树脂、环氧树脂、聚硅氧烷树脂和聚硅氧烷官能化的环氧树脂的材料。
18、根据权利要求16的液晶显示器，其中，所说的混合物还包括光散射材料的颗粒。
19、根据权利要求14的液晶显示器，其中，所说的背光源包括至少一个发光二极管。
20、根据权利要求19的液晶显示器，其中，所说的混合物设置在所述发光二极管的发光元件上。
21、根据权利要求13的液晶显示器，其中，所说的背光源包括至少一个有机场致发光器件。
22、根据权利要求21的液晶显示器，其中，所说的有机场致发光器件包括置于两个电极之间的有机发光层，当通过所述电极施加电压时，所述的有机发光层发光。
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US20040056990A1 (en) 2004-03-25
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