CN1738781A - 用于光转化的陶瓷复合材料及其应用 - Google Patents
用于光转化的陶瓷复合材料及其应用 Download PDFInfo
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- CN1738781A CN1738781A CNA2004800024937A CN200480002493A CN1738781A CN 1738781 A CN1738781 A CN 1738781A CN A2004800024937 A CNA2004800024937 A CN A2004800024937A CN 200480002493 A CN200480002493 A CN 200480002493A CN 1738781 A CN1738781 A CN 1738781A
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Abstract
用于光转化的陶瓷复合材料,其是包括两种或者多种基体相的凝固体,基体相的各组分是两种或者多种选自金属氧化物和复氧化物中的氧化物,每种复氧化物由两种或者多种金属氧化物形成,其中,该基体相中至少有一种是含有已活化的氧化物的荧光体相。该凝固体优选的用单向凝固法获得。这种用于光转化的陶瓷复合材料在亮度,光混和性能,耐热性和抗紫外光性能上是优异的。
Description
技术领域
本发明涉及用于光转化的陶瓷复合材料,其具有将一些照射光转化成与照射光波长不同的光,并同时将转化的光与未转化的照射光相混和,转化成与照射光色调不同的光的功能,还涉及它的应用。
背景技术
随着近来蓝光发光二极管实用化,利用这种二极管作光发射源开发白光光源的研究正积极进行。白光作照明光源具有很大需求,另外,白光的很大好处是,与现有的白光光源相比,发光二极管具有低的功耗,并能确保长的寿命。
依据这种方法,用具有光转化功能的材料将从蓝光发光二极管中发出的蓝光转化成白光,其中,在三种基本光颜色中,除了蓝光包含在从蓝光发光二极管发出的光中外,必须要发出绿光和红光。为此目的,使用可以吸收特定波长的光并可发出与所吸收的光波长不同的光的荧光体。
根据例如日本未审专利公开(Kokai)No.2000-208815中所描述的将蓝光发光二极管的蓝光转化成白光的方法,在发光器件的前端采用了含有可吸收部分蓝光并发出黄光的荧光体的涂层,以及将光源的蓝光与此涂层的黄光相混和的模制层。参照图1,涂层2位于发光器件1的前端,在其上进一步提供模制层3。在图中,4是电导线,5和6各为引线。此时,颜色混和不仅发生在模制层3中,而且发生在涂层2中。
对于在传统技术中采用的涂层,在发光器件上涂覆的是环氧树脂和铈化合物掺杂的YAG(钇-铝-石榴石)粉的混和物(参见Kokai No.2000-208815)。然而,依据这种方法,几乎不能得到具有好的可重复性的均匀白光,这是因为难以控制使得,例如保证荧光粉和树脂的均匀混和,或者优化涂层膜的厚度。同时,使用透光性低的荧光粉对制造高亮度的发光二极管是一个障碍。而且,当要得到高强度的光时,热量储存的提升也是一个问题,对于涂层和模制层,树脂的耐热性和抗紫外性成为重要问题。
为了克服这些问题,必需要有可以通过吸收发光二极管发出的蓝光而发射出黄光,并同时呈现出优异的光混和性能和高的耐热性的材料。
本发明的一个目的就是提供不但具有光转化功能,即吸收特定波长的光并发射出与所吸收的光波长不同的光的功能,而且可确保高亮度和好的光混和性能,以及优异的耐热性和抗紫外性的陶瓷复合材料。
发明内容
本发明人已发现上述目的可以通过包括两种或多种氧化物并包括含可发出荧光的化合物的基体相的凝固体来实现。本发明的完成正是基于这一发现。
即,本发明所提供的如下:
(1)用于光转化的陶瓷复合材料,其是包括两种或多种基体相的凝固体,所述基体相的各组分是两种或者多种选自金属氧化物和复氧化物的氧化物,每种复氧化物由两种或者多种金属氧化物形成,其中,这些基体相至少有一种是含有活化的氧化物的荧光体相。
(2)如上面(1)中所述的用于光转化的陶瓷复合材料,其中,这种凝固体用单向凝固法得到。
(3)如上面(2)中所述的用于光转化的陶瓷复合材料,其中,各基体相都是连续且三维分布的,并彼此交错。
(4)如上面(1)至(3)任意之一中所述的用于光转化的陶瓷复合材料,其中,金属氧化物选自Al2O3,MgO,SiO2,TiO2,ZrO2,CaO,Y2O3,BaO,BeO,FeO,Fe2O3,MnO,CoO,Nb2O5,Ta2O5,Cr2O3,SrO,ZnO,NiO,Li2O,Ga2O3,HfO2,ThO2,UO2,SnO2以及稀土元素氧化物(La2O3,Y2O3,CeO2,Pr6O11,Nd2O3,Sm2O3,Gd2O3,Eu2O3,Tb4O7,Dy2O3,Ho2O3,Er2O3,Tm2O3,Yb2O3以及Lu2O3)。
(5)如上面(1)至(3)任意之一中所述的用于光转化的陶瓷复合材料,其中,由两种或者多种金属氧化物的组合形成的复氧化物选自3Al2O3·2SiO2(莫来石),MgO·Al2O3,Al2O3·TiO2,BaO·6Al2O3,BaO·Al2O3,BeO·3Al2O3,BeO·Al2O3,3BeO·Al2O3,CaO·TiO2,CaO·Nb2O3,CaO·ZrO2,2CoO·TiO2,FeAl2O4,MnAl2O4,3MgO·Y2O3,2MgO·SiO2,MgCr2O4,MgO·TiO2,MgO·Ta2O5,MnO·TiO2,2MnO·TiO2,3SrO·Al2O3,SrO·Al2O3,SrO·2Al2O3,SrO·6Al2O3,SrO·TiO3,TiO2·3Nb2O5,TiO2·Nb2O5,3Y2O3·5Al2O3,2Y2O3·Al2O3,2MgO·2Al2O3·5SiO2,LaAlO3,CeAlO3,PrAlO3,NdAlO3,SmAlO3,EuAlO3,GdAlO3,DyAlO3,Yb4Al2O9,Er3Al5O12,11Al2O3·La2O3,11Al2O3·Nd2O3,11Al2O3·Pr2O3,EuAl11O18,2Gd2O3·Al2O3,11Al2O3·Sm2O3,Yb3Al5O12,CeAl11O18以及Er4Al2O9。
(6)如上面(1)至(3)任意之一中所述的用于光转化的陶瓷复合材料,其中,构成基体的相是α-Al2O3相和Y3Al5O12相两种相。
(7)如上面(1)至(6)任意之一中所述的用于光转化的陶瓷复合材料,其中,活化元素是铈。
(8)一种光转化方法,包括通过使用上面(1)至(7)任意之一中所述的用于光转化的陶瓷复合材料将从发光二极管中发出的光的颜色转化成一种不同的颜色。
(9)一种光转化方法,包括使用用于光转化的陶瓷复合材料将蓝光转化成白光,该陶瓷复合材料包括的基体中的组分相是α-Al2O3相和Y3Al5O12相,并且Y3Al5O12相是用铈活化的荧光体。
(10)发光二极管,其包括发光二极管芯片和上面(1)至(7)任意之一中所述的用于光转化的陶瓷复合材料。
(11)上面(10)中所述的发光二极管,其中,用于光转化的陶瓷复合材料中包括能被从发光二极管芯片中发出的可见光激发,并能发出波长比激发波长长的可见光荧光的基体相。
(12)上面(10)或者(11)中所述的发光二极管,其中,用于光转化的陶瓷复合材料将发光二极管芯片发出的蓝光转化成白光。
附图说明
图1:传统发光二极管的截面图。
图2:本发明的发光二极管的一个实施例的截面图。
图3:由一个实施例中得到的材料的组织的电子显微镜照片。
图4:在一个实施例中得到的材料中的YAG相结构的电子显微镜照片。
图5:实施例1中得到的材料的荧光特性谱。
图6:测量荧光特性的方法的简略示意图。
图7:在探测器中的检测示例的视图。
图8:光转化材料的荧光特性与样品厚度之间的关系的示例。
图9:光转化材料的荧光特性与样品厚度之间的关系的示例。对530nm的光,放大了比例尺。
图10:实施例2和对比实施例中得到的材料的荧光特性谱。
具体实施方式
在本发明的陶瓷复合材料中,通过控制制造条件,可以得到没有晶团(colony)和空隙的均匀组织。而且在对制备为包括预定组分的混和粉末用压力烧结得到的通常的烧结体中存在的晶界并不存在。并且,通过控制制造条件,还可以得到这样的陶瓷复合材料,其中构成这种复合材料每种氧化物或者复氧化物都由单晶/单晶,单晶/多晶或者多晶/多晶构成。在本发明中采用的“单晶”指的是这样一种晶体结构状态,通过X射线衍射只能看到特定晶面的衍射峰。另外,还可以通过向构成该复合材料的一个相中溶解或者去除除了组分氧化物之外的氧化物,或者使其存在在界面处,来改变光学性能,机械性能和热性能。
本发明的陶瓷复合材料具有这样的结构,其中的组分氧化物相是均匀的,并且在微观尺度上是连续连接的。可以通过改变凝固条件来控制每种相的尺寸。其通常是从1到50微米。
本发明的陶瓷复合材料通过将原料氧化物熔融,并然后将其凝固而制得。例如,将熔融体装入到保持在预定温度的坩埚中,然后在控制冷却温度的同时使其冷却凝固,通过这种简单容易的方法可以得到凝固体。最优选的是单向凝固法。这种工艺粗略的描述如下。
将形成基体相的金属氧化物和做荧光发射源的金属氧化物按照所希望的组成比混和,得到混和粉末。混和的方法不受具体限定,干混法和或者湿混法和都可以采用。接着,将混和粉末用熟知的熔融炉比如电弧炉在足够的温度下加热并熔融,使装入的原材料熔融。例如,对于Al2O3和ErO3,将混和粉末加热并在1900至2000℃下熔融。
将所得到的熔融体原样装入到坩埚中进行单向凝固,或者在熔体一旦凝固后,将所得到的块体粉碎,装入到坩埚中,再次进行加热/熔融,然后通过把坩埚从熔融炉的加热区中退出,使得到的熔融液体单向凝固。熔体的单向凝固可在大气压下进行,为了得到在晶相中缺陷较少的材料,其优选的要在4000Pa或者更低的压力下进行,更优选的为0.13Pa(10-3Torr)或者更低。
依据熔体的组成,将坩埚从加热区中的退出速度,也就是熔体的凝固速度设定在合适的值。退出速度通常为50mm/hour或者更低,优选的为1-20mm/hour。
对于单向凝固所用的设备,可以采用熟知的设备,其中坩埚垂直安放在沿垂直方向放置的圆筒状容器里,加热用的感应线圈安在圆筒容器中部的外壁上,还装有降低容器中空间压力的真空泵。
在本发明中用于光转化的,构成该陶瓷复合材料的至少一种基体相的荧光体可以通过向金属氧化物或者复氧化物中加入活化元素而得到。这种荧光体材料是熟知的,不需要另外做具体描述。在本发明的用于光转化的陶瓷复合材料所用的陶瓷复合材料中,使至少一种基体相有荧光体相的功能,而且,该陶瓷复合材料与在例如本发明申请人(受让人)以前提出的日本的未审专利申请(Kokai)Nos.7-149597,7-187893,8-81257,8-253389,8-253390和9-67194以及它们相应的美国申请(U.S.专利Nos.5569547,5484752和5902763)中所公开的那些基本相同,并且,可以用在这些专利申请(专利)中公开的方法制造。这里,将在这些专利申请和专利中所公开的内容用作参考。
从所得到的凝固体上切下所需形状的块体,用作将某种波长的光转化成具有其它目标色调的光的陶瓷复合材料衬底。
对于构成基体相的氧化物的种类来讲,可以采用各种组合,但优选的是选自金属氧化物和由两种或多种金属氧化物制成的复氧化物的陶瓷。
金属氧化物的例子包括氧化铝(Al2O3),氧化锆(ZrO2),氧化镁(MgO),氧化硅(SiO2),氧化钛(TiO2),氧化钡(BaO),氧化铍(BeO),氧化钙(CaO),氧化铬(Cr2O3),以及稀土元素氧化物(La2O3,T2O3,CeO2,Pr6O11,Nd2O3,Sm2O3,Gd2O3,Eu2O3,Tb4O7,Dy2O3,Ho2O3,Er2O3,Tm2O3,Yb2O3,Lu2O3)。
由这些金属氧化物制成的复氧化物的例子包括LaAlO3,CeAlO3,PrAlO3,NdAlO3,SmAlO3,EuAlO3,GdAlO3,DyAlO3,ErAlO3,Yb4Al2O9,Y3Al5O12,Er3Al5O12,11Al2O3·La2O3,11Al2O3·Nd2O3,3Dy2O3·5Al2O3,2Dy2O3·Al2O3,11Al2O3·Pr2O3,EuAl11O18,2Gd2O3·Al2O3,11Al2O3·Sm2O3,Yb3Al5O12,CeAl11O18以及Er4Al2O9。
例如,当为Al2O3和Gd2O3的组合时,Al2O3:78mol%和Gd2O3:22mol%形成共晶,所以,可以得到其中包括Al2O3相和钙钛矿结构的GdAlO3相的陶瓷复合材料,GdAlO3是Al2O3和Gd2O3的复氧化物。相似的,α-Al2O3相和GdAlO3相的部分可以分别在大约20-80vol%和80-20vol%的范围内变化。其它的由两种或多种金属氧化物制成的,并具有钙钛矿结构的复氧化物的例子包括LaAlO3,CeAlO3,PrAlO3,NdAlO3,SmAlO3,EuAlO3和DyAlO3。当这些复氧化物中的任何一种构成本发明中的复合材料时,可以得到具有精细组织和大机械强度的陶瓷复合材料。
并且,当为Al2O3和Er2O3的组合时,Al2O3:81.1mol%和Er2O3:18.9mol%形成共晶,所以,可以得到其中包括Al2O3相和石榴石结构的Er3Al5O12相的陶瓷复合材料,Er3Al5O12是Al2O3和Er2O3的复氧化物。相似的,α-Al2O3相和Er3Al5O12相的部分可以分别在大约20-80vol%和80-20vol%的范围内变化。其它的由两种或多种金属氧化物制成的,并具有石榴石结构的复氧化物的例子包括Yb3Al5O12。当这些复氧化物中的任何一种构成本发明中的复合材料时,可以得到具有高蠕变强度的陶瓷复合材料。
在这些中,Al2O3和稀土元素氧化物的组合是优选的。这是因为可以得到机械性能和光学性能都优异的材料,还因为可以采用下面描述的单向凝固法方便的获得其中各个基体相都是三维且连续交错在一起的复合材料,并且可以形成可让包括稀土金属氧化物的荧光体稳定存在的基体相。具体的,包括由Al2O3和Y2O3制成的Al2O3和Y3Al5O12两种基体相的复合材料是优选的。
通过向上述金属氧化物或者复氧化物中加入活化元素得到荧光体。
结合到基体相中的活化元素(荧光源)根据光源的波长和对光源的颜色进行转化所需要的色调进行合适的选择。例如,为了将蓝光发光二极管的430-480nm的蓝光转化成白光,优选的用铈做活化元素,并加入铈氧化物。当然,可以通过加入多种元素来对颜色进行调节,例如,铈和另外一种荧光源。除了铈外,活化元素依赖于基体氧化物的种类而变化,例如,可以用铽,铕,锰,铬,钕和镝。
对于将活化元素(荧光源)加入到基体氧化物相中,可以通过加入预定量的活化元素的氧化物来实现。
本发明的陶瓷复合材料包括几种基体相,为活化而加入的元素被认为依据分布系数存在且出现在每个基体相中。发射的荧光的相取决于组分。例如,包括氧化铝(Al2O3)和Y3Al5O12基体相的复合材料由Al2O3和Y2O3制成。荧光从Y3Al5O12相中发出,这种相被认为是可用Y3Al5O12:Ce表示的铈活化的荧光体。依据分布系数,在该复合物中的Ce大多数存在于Y3Al5O12相中,很少存在于氧化铝相中。其中包含活化元素的相并不总是荧光体,不能不加选择的认为是荧光体,因为荧光体的形成取决于本发明的陶瓷复合材料的组分,至少一种基体相是用于发射荧光的相。
氧化铝和Y3Al5O12的每个都是透明的,包括以Y3Al5O12:Ce表示的铈活化的荧光体的基体相基本上也是透明的。在包括氧化铝(Al2O3)和Y3Al5O12:Ce基体相的复合材料中,进入并透过氧化铝的蓝光是原来的蓝光,而进入到Y3Al5O12:Ce相中的部分蓝光被转化为黄光。这些光在该复合物中混和,由此透射光看上去是白光。
通过单向凝固法,可以得到具有每种基体相都是三维的并彼此复杂的相互交错的结构的复合材料(参见例如图3和4)。具体的,当采用Al2O3和稀土金属氧化物时,具有这种结构的复合材料很容易获得。这种结构有利于作为光转化材料,因为除了Al2O3相的高透明度外,Y3Al5O12:Ce基体相可以作为整体起到均匀的荧光体的作用(决定光发射的活化元素在原子尺度上均匀分布在整个基体相中)。由于这些相是三维的并复杂交错在一起的结构的原因,实现了透射光和荧光的高亮度和有效的颜色混和。
而且,在将荧光体粉末和树脂混和而得到的材料的情况下,在粉末表面发生光散射,而本发明的复合材料中没有这种光散射,使得光的透过性高,可以有效利用发光二极管的光(蓝光)。
另外,本发明的复合材料是具有高熔点的陶瓷材料,因此,其优点是热稳定性非常高,由此不会产生在树脂材料中的耐热性问题,也不会产生因紫外光而产生的破坏问题。
因此,本发明的陶瓷复合材料是这样的陶瓷复合材料,其不但具有转化的功能,也就是吸收某种波长的光,并发射出与所吸收的光波长不同的荧光的功能,而且,在亮度,光的透过性,光的混和性能,光利用性,耐热性和抗紫外性上都是优异的。这是适合用作发光二极管颜色转化目的的用于光转化的陶瓷复合材料。
在将本发明的进行光转化的陶瓷复合材料用于发光二极管的情况下,发光二极管可以按例如图2所示制作,将本发明的用于光转化的陶瓷复合材料8置于发光二极管(LED)芯片1的前端。在图2中,与图1中相似,4是电导线,5和6每一个都是引线。芯片(元件)1还可以放置的与用于光转化的陶瓷复合材料8相接触,这从元件热辐射的角度考虑看上去是更加优选的。容器或者板的形状可以按需要改变,构造材料也可以按需要进行选择。
下面,参照具体实施例对本发明进行更详细的描述。
实施例
(实施例1)
将α-Al2O3粉末(纯度:99.99%)和Y2O3粉末(纯度:99.999%)按82∶18的摩尔比混和,并将CeO2粉末(纯度:99.99%)混入使其比率为在每摩尔由所加入的氧化物反应生成的Y3Al5O12中为0.01摩尔。将这些粉末在乙醇中球磨16小时湿法混和,然后,用蒸发器将乙醇去除,得到原料粉末。将该原料粉末在真空炉中初步熔融,作为单向凝固所用的原料。
将得到的原料装入到钼坩埚中,然后将坩埚放到单向凝固设备中。将此原料在1.33×10-3Pa(10-5Torr)的压力下熔融,在同样的气氛中,将此坩埚以5mm/hour的速度下移,由此得到凝固体。该凝固体呈现黄色。
图3所示的是沿垂直于其凝固方向的凝固体的截面组织。白色区域是Y3Al5O12(更确切的是Y3Al5O12:Ce)相,黑色区域是Al2O3相。可以看出这种凝固体中没有晶团或者晶界相,所具有的均匀组织中不存在任何的气泡或者空隙。
图4是沿垂直于凝固方向给出的样品中的Y3Al5O12相三维结构的电子显微照片,样品这样得到,沿所述同一方向切出样品,然后将其和碳粉一起在1600℃加热,去除样品表面附近的Al2O3相。
观测了从基本上垂直于凝固方向的表面上得到的X射线衍射,结果,只观测到了分别对应于YAG的(110)面和α-Al2O3的(110)面的衍射峰。
从这些结果可以看出,在这种复合材料中,存在两种相,α-Al2O3单晶相和Y3Al5O12单晶相。这些相是连续且三维的分布,并彼此交错。
沿与凝固方向垂直的方向,从该凝固体上切下1mm厚的衬底,用荧光测试设备对这种材料的荧光特性进行测试。结果如图5所示。发现当用大约450nm的蓝光照射时,这种材料具有宽谱的黄色荧光,并在大约530nm处有峰。因此,Y3Al5O12相是可表示为Y3Al5O12:Ce的荧光体。
此后,按图6所示的方法,用蓝光进行了证实混和性能的测量。将镜子14放在样品13的底部,这样透过样品的光可以返回到探测器中。当镜子按这种方式放置时,从样品的表面或者内部反射的光进入到探测器6中。所采用的发射光12是来自光源1的450nm的蓝光。采用的样品厚度有四种:0.1mm,0.2mm,0.5mm和1.0mm。
图7是探测器中的探测示例。在此图中,采用了两个厚度不同的样品,可以看出随着样品厚度的增加,450nm的蓝光变弱。
图8给出的是样品厚度与蓝光强度和黄色荧光强度之间的关系。对于黄色荧光,图9通过改变坐标尺度给出了放大图。随着样品厚度的增加,蓝光强度变弱,但在厚度等于或者大于0.5mm时基本上恒定。而黄色荧光的强度随着样品厚度的增加而增强,并在达到最大值后,强度变弱,与蓝光相似,在厚度等于或者大于0.5mm时,基本上恒定。在样品厚度大的区域测量值变恒定的原因是,测量的是来自样品表面的蓝光的反射光和来自表面的从低于某个特定值深度的相中产生的黄色荧光的散射光。这表明,对于厚样品,入射光被样品吸收引起波长转化,不能透过样品,相反,对于薄样品,入射光的一部分透过样品,在镜子上反射,部分的反射光会再次从样品中出来。
从这些观测结果可以看出,这种材料可透过蓝色的入射光,并同时将部分蓝光转化成宽谱的在530nm附近有峰的黄光,这两种光混和发出白光。还知道,通过控制材料的厚度,可以对颜色进行调节。
(实施例2)
从实施例1中制得的用于光转化的陶瓷复合材料上,用金刚石切割器切下一薄片,将该薄片加工成圆盘状的可固定在如图2中所示的发光二极管上的样品,制成了发光二极管。所用蓝光发光二极管芯片的波长为470nm。图10是这样得到的白光发光二极管的发光光谱。观察到了大约470nm的蓝光和从用于光转化的陶瓷复合材料中发出的530nm的光。
而且,将这种发光二极管放到积分球中测量颜色。结果,发射光的颜色具有的CIE色度标为x=0.27和y=0.34,被证实是白光。
(对比实施例1)
将Al2O3(纯度:99.99%)和Y2O3(纯度:99.999%)按实施例1中所描述的方法混和,Ce的活化量为每摩尔Y3Al5O12中0.03摩尔,并干燥以得到原料。另外,向100份重量的原料中混入5份重量的氟化钡(BaF2)做熔剂。将混和物装入到氧化铝坩埚中,并在空气中于1600℃烧制1小时。在坩埚恢复到室温后,将样品取出,并用硝酸溶液洗涤去除熔剂。之后,将40份重量的这样的Ce活化的YAG粉末与100份重量的环氧树脂揉捏在一起,将树脂在120℃下硬化1小时,在150℃下4小时得到致密体。将该致密体加工成圆盘状,制出图2所示的发光二极管。调节圆盘的厚度使发光二极管可发出与实施例2中相同颜色的发射光。以此方式测得的圆盘的厚度基本上与实施例2中的陶瓷复合材料圆盘的厚度相同。发光二极管的颜色具有的CIE色度标为x=0.27和y=0.36。用积分球在380-780nm范围内测量了这样制得的发光二极管的辐射能。并以相同的方式对实施例2中的发光二极管的辐射能进行了测量。图10给出的是这些白光二极管的发光光谱。结果,实施例2的辐射能是对比实施例1的大约1.5倍。这表明本发明的用于波长转化的陶瓷复合材料可以透过更多数量的光,能够制造高亮度的发光二极管。
工业适用性
本发明的用于光转化的陶瓷复合材料在亮度,光混和性能,耐热性和抗紫外性上是优异的。特别的,本发明的用于光转化的陶瓷复合材料在由蓝光得到白光上性能优异,所以通过合理采用低功耗长寿命的发光二极管,其具有作为照明光源的高的实用价值。
Claims (12)
1.用于光转化的陶瓷复合材料,其是包括两种或者多种基体相的凝固体,所述基体相的各组分是两种或者多种选自金属氧化物和复氧化物中的氧化物,每种复氧化物由两种或者多种金属氧化物形成,其中,所述基体相中至少有一种是含有已活化氧化物的荧光体相。
2.根据权利要求1中的用于光转化的陶瓷复合材料,其中,该凝固体用单向凝固法得到。
3.根据权利要求2中的用于光转化的陶瓷复合材料,其中,各基体相都是连续且三维的分布,并彼此交错。
4.根据权利要求1-3任意之一中的用于光转化的陶瓷复合材料,其中,金属氧化物选自Al2O3,MgO,SiO2,TiO2,ZrO2,CaO,Y2O3,BaO,BeO,FeO,Fe2O3,MnO,CoO,Nb2O5,Ta2O5,Cr2O3,SrO,ZnO,NiO,Li2O,Ga2O3,HfO2,ThO2,UO2,SnO2以及稀土元素氧化物(La2O3,Y2O3,CeO2,Pr6O11,Nd2O3,Sm2O3,Gd2O3,Eu2O3,Tb4O7,Dy2O3,Ho2O3,Er2O3,Tm2O3,Yb2O3以及Lu2O3)。
5.根据权利要求1-3任意之一中的用于光转化的陶瓷复合材料,其中,由两种或者多种金属氧化物的组合形成的复氧化物选自3Al2O3·2SiO2(莫来石),MgO·Al2O3,Al2O3·TiO2,BaO·6Al2O3,BaO·Al2O3,BeO·3Al2O3,BeO·Al2O3,3BeO·Al2O3,CaO·TiO2,CaO·Nb2O3,CaO·ZrO2,2CoO·TiO2,FeAl2O4,MnAl2O4,3MgO·Y2O3,2MgO·SiO2,MgCr2O4,MgO·TiO2,MgO·Ta2O5,MnO·TiO2,2MnO·TiO2,3SrO·Al2O3,SrO·Al2O3,SrO·2Al2O3,SrO·6Al2O3,SrO·TiO3,TiO2·3Nb2O5,TiO2·Nb2O5,3Y2O3·5Al2O3,2Y2O3·Al2O3,2MgO·2Al2O3·5SiO2,LaAlO3,CeAlO3,PrAlO3,NdAlO3,SmAlO3,EuAlO3,GdAlO3,DyAlO3,Yb4Al2O9,Er3Al5O12,11Al2O3·La2O3,11Al2O3·Nd2O3,11Al2O3·Pr2O3,EuAl11O18,2Gd2O3·Al2O3,11Al2O3·Sm2O3,Yb3Al5O12,CeAl11O18以及Er4Al2O9。
6.根据权利要求1-3任意之一中的用于光转化的陶瓷复合材料,其中,构成基体的相是α-Al2O3相和Y3Al5O12相两种相。
7.根据权利要求1-6任意之一中的用于光转化的陶瓷复合材料,其中,活化元素是铈。
8.光转化方法,其包括通过使用权利要求1-7任意之一中的用于光转化的陶瓷复合材料,将从发光二极管中发出的光的颜色转化成不同的颜色。
9.光转化方法,其包括通过使用用于光转化的陶瓷复合材料将蓝光转化成白光,该陶瓷复合材料包括的基体中的组分相是α-Al2O3相和Y3Al5O12相,并且Y3Al5O12相是用铈活化的荧光体。
10.发光二极管,其包括发光二极管芯片和权利要求1-7任意之一中的用于光转化的陶瓷复合材料。
11.根据权利要求10中的发光二极管,其中,用于光转化的陶瓷复合材料包括能被从发光二极管芯片中发出的可见光激发,并能发出波长比激发波长长的可见光荧光的基体相。
12.根据权利要求10或11中的发光二极管,其中,用于光转化的陶瓷复合材料将发光二极管芯片发出的蓝光转化成白光。
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EP2497758B1 (en) | 2019-05-29 |
CN101555128A (zh) | 2009-10-14 |
KR20050093839A (ko) | 2005-09-23 |
KR100639647B1 (ko) | 2006-11-01 |
EP2497758A3 (en) | 2016-05-25 |
US8900480B2 (en) | 2014-12-02 |
JPWO2004065324A1 (ja) | 2006-05-18 |
JP4609319B2 (ja) | 2011-01-12 |
TWI314364B (en) | 2009-09-01 |
EP2497758A2 (en) | 2012-09-12 |
EP1588991A4 (en) | 2011-05-18 |
TW200425540A (en) | 2004-11-16 |
US20060124951A1 (en) | 2006-06-15 |
EP1588991B1 (en) | 2019-04-17 |
WO2004065324A1 (ja) | 2004-08-05 |
EP1588991A1 (en) | 2005-10-26 |
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