CN100431091C - 具有两带荧光物质的放电灯 - Google Patents

具有两带荧光物质的放电灯 Download PDF

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CN100431091C
CN100431091C CNB2004100485812A CN200410048581A CN100431091C CN 100431091 C CN100431091 C CN 100431091C CN B2004100485812 A CNB2004100485812 A CN B2004100485812A CN 200410048581 A CN200410048581 A CN 200410048581A CN 100431091 C CN100431091 C CN 100431091C
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CN1574193A (zh
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G·胡伯
F·耶曼
U·米勒
M·查肖
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PATRA Patent Treuhand Munich
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    • HELECTRICITY
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    • H01JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
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    • H01ELECTRIC ELEMENTS
    • H01JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00Gas-discharge or vapour-discharge lamps
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Abstract

一个具有包围一种放电介质的一个放电容器(2)的放电灯(1),该放电介质在灯工作时在VUV范围内发出电磁辐射,所述放电灯在放电容器壁的内侧面上具有朝向放电介质的黄色荧光物质层和在其下面的蓝色荧光物质层。与传统的三带荧光物质混合物相比由此达到一种较高的光通量和较低的色品位置偏移。

Description

具有两带荧光物质的放电灯
技术领域
本发明涉及一种具有荧光物质的放电灯,其中在工作时在放电灯的放电容器内所包含的一种放电介质主要在VUV范围内发出电磁辐射。在此在大约200nm以下的、特别是在大约100nm至200nm的范围内的波长理解为VUV范围。VUV辐射借助于荧光物质转变为具有较长波长的辐射,例如转变为可见光的光谱范围。
本发明也特别涉及上述类型的放电灯,该放电灯此外设计为借助于介电阻碍放电的运行、所谓的介电障碍放电灯。这种放电灯本来就是这种技术状况并且已经在以前的、同一申请人的专利申请中作了极其详尽地描述。在此不再详细探讨这种放电灯的基本的物理的和技术的细节,而请参阅有关的技术标准,在这些标准中该灯偶尔也称作静止放电灯。该灯也特别适合于脉冲工作方式,在该方式中特别高效地产生辐射。典型以惰性气体、主要是氙或者混合惰性气体填充该灯。在灯工作期间在放电容器内部特别产生受激准分子、例如Xe2 *,该受激准分子发出具有最大值为大约172nm的分子带辐射。
对于以白光为前提条件的应用-例如对于普通照明、电子分色机、彩色液晶显示屏的背景照明等等,VUV辐射借助于适当的白光-荧光物质混合物进行转换。为此考虑了发出红色、绿色和蓝色的荧光物质成分(RGB)的传统三带荧光物质混合物。然而有这样的问题,在灯寿命的过程中由于VUV辐射而特别损害普遍使用的蓝色荧光物质成分,由此发光强度就会丧失。由此荧光物质混合物的各种荧光物质成分的发光强度不同地改变,并引起色品位置偏移(Farbortverschiebung)的增加。此外由蓝色荧光物质成分发出的辐射偏移到较长波的光谱范围中。这将使得已知的红色荧光物质成分在以VUV辐射激发时有相对较差的量子效率。
背景技术
专利文献US-A 5714835指出了具有一种白光-荧光物质混合物的介电障碍放电灯。这种白光-荧光物质混合物的成分是:
红色荧光物质成分(Y0.72Gd0.2Eu0.08)BO3
绿色荧光物质成分(La0.43Ce0.39Tb0.18)PO4
蓝色荧光物质成分(Ba0.94Eu0.06)MgAl10O17
在灯的内部惰性气体氙作为放电介质存在。在灯工作期间放电介质发出小于200nm波长的辐射,该辐射由白光-荧光物质混合物转变为白光。
发明内容
本发明的任务是,消除开始提到的问题并且给出一个以在工作中发出VUV辐射的放电介质填充的、具有荧光物质的放电灯,该灯关于其光学技术特性表明改善的持久性能。该任务的特殊方面是,该灯在它的寿命期间具有较低的色品位置偏移。该任务的另一个方面是达到较高的光通量。
通过具有一个放电容器、处在放电容器内部并且在灯工作时在VUV范围内发出辐射的一种放电介质、一种涂敷在放电容器壁上的荧光物质的一个放电灯解决所述任务,其特征在于,荧光物质包括黄色和蓝色荧光物质成分(两带荧光物质(Zweibandenleucht-stoff))。
因为所述荧光物质根据本发明没有红色荧光物质成分、也就是说正好放弃了具有相对较差的VUV激发效率的荧光物质成分,所以通过这种方式可以达到较高的光通量。
这两种荧光物质成分原则上可以作为荧光物质混合物以唯一一个荧光物质层进行涂敷。这有这样的优点,即荧光物质辐射的获得的色品位置不依赖于被调整的层厚的生产波动,并因此可以比所述两种荧光物质成分的每一种成分以各自独立的层进行涂敷更简单且更准确地保持恒定。其它细节在实施例中进一步详细阐述。
然而也可以有益地以各自一个独立的荧光物质层、也就是说以一个黄色荧光物质层和蓝色荧光物质层涂敷所述两种荧光物质成分。在第一变型中荧光物质层的顺序是这样的,即从放电介质向外首先看到黄色荧光物质层,例如YAG:Ce,然后是蓝色荧光物质层、例如BaMgAl10O17:Eu。为了这个目的例如将荧光物质层涂敷在放电容器的内壁上,更确切地说,蓝色荧光物质层涂敷在黄色荧光物质层的下面。这有附加的优点,即黄色荧光物质层部分地吸收高能的VUV辐射,如此保护处于下面的VUV敏感的蓝色荧光物质层。由此最终得到一种改善了的蓝色荧光物质层的持久性能。通过上述措施最终避免或至少减少开始提到的、VUV敏感的荧光物质的发光强度通常随着VUV辐射的降低和在荧光物质混合物中由此引起的色品位置偏移,此外黄色-蓝色荧光物质组合物的特定选择能够放弃相对低效的红色荧光物质成分、比如YBO3:Eu。由此可以达到一个较高的光通量。
在第二变型中,以相反的顺序涂敷所述两种荧光物质成分,也就是说“外部的”、关于放电介质的第一荧光物质层由蓝色荧光物质成分、例如BaMgAl10O16:Eu制成。“内部的”、关于放电介质的第二荧光物质层由黄色荧光物质成分、例如YAG:Ce制成。此外在这种情况下如此选择“外部的”蓝色荧光物质层的厚度,使得射入到蓝色荧光物质层中的VUV辐射在那里基本上完全被吸收,并且因此位于下面的、“内部”的黄色荧光物质层基本完全不受VUV辐射的影响。由此黄色荧光物质由仅仅通过由蓝色荧光物质层发出的蓝色辐射所激发。因此实现,在灯的寿命过程中黄色辐射以如同蓝色荧光物质层由于出现的VUV辐射而递降的基础上的蓝色辐射同样的比例下降。通过所述措施最终实现,色品位置有益地几乎不依赖于灯的使用寿命保持恒定。在把BaMgAl10O16:Eu用于“外部的”蓝色荧光物质层的情况下层重在大约3.20和3.40mg/cm2之间的范围证明是适当的。
原则上所有已知的、可以用VUV辐射激励的黄色或者蓝色荧光物质成分都适合,主要是具有较高量子效率的如此成分。下面列举的荧光物质个体上是特别适合。
例如适合作为黄色荧光物质成分的是:
A)(Y,Gd,Tb)AG:Ce,
例如适合作为蓝色荧光物质成分的是:
B)BaMgAl10O17:Eu;
C)SrMgAl10O17:Eu;
D)q aQQQw(Ba,Sr)MgAl10O17:Eu;
上述列举的荧光物质成分的化学计量成分的细微变化是常见的并且因此由上面的描述共同包含。
附图说明
下面根据实施例详细阐述本发明。附图示出:
图1a  介电阻碍放电灯的第一实施例的侧面图,
图1b  图1a的灯沿着线AB的横截面,
图1c  图1b的灯的横截面的局部放大图,
图2   根据图1a-1c的试验灯的光谱,
图3a  一个介电阻碍放电灯的第二实施例的侧面图,
图3b  图3a的灯沿着线AB的横截面,
图3c  图3b的横截面的局部放大图。
具体实施方式
在本发明的一个实施例的下面阐述中涉及图1a-1c。
放电灯1具有管状双侧封闭的、外径为大约10mm的放电容器2。该放电容器2由碱石灰玻璃制成,并且把氙作为放电介质以大约15kPa的压力进行填充。两个作为线状印刷导线形成的金属电极3a、3b彼此相对并且平行于放电容器的纵向轴线涂敷在放电容器2的壁的外侧面上。在放电容器2的壁的内侧面上(大约450cm2)涂敷“内部的”荧光物质层4和“外部的”荧光物质层5。“外部的”、关于放电介质的第一荧光物质层5由黄色荧光物质成分YAG:Ce制成。“内部的”、关于放电介质的第二荧光物质层4由BaMgAl10O16:Eu制成。
就这种灯类型I以所述两层4或者5的不同层重或者层重比生产了多个试验灯。在下面的表中列举了由此获得的色品位置的坐标(按照CIE标准比色图表)。
  灯号   层5(mg/cm<sup>2</sup>)   层4(mg/cm<sup>2</sup>)   比例、层4/5   x   y
  1   2.69   3.22   1.20   0.420   0.501
  2   2.87   3.07   1.07   0.423   0.501
  3   3.02   2.84   0.94   0.424   0.500
  4   1.78   2.91   1.64   0.415   0.498
  5   1.11   3.00   2.70   0.391   0.474
  6   1.27   2.82   2.23   0.402   0.490
7 0.62 2.44 3.93 0.336 0.395
  8   0.69   2.62   3.81   0.343   0.408
  9   0.76   2.73   3.62   0.356   0.425
  10   0.49   2.84   5.82   0.309   0.355
  11   0.49   2.98   6.09   0.317   0.367
  12   0.38   3.07   8.12   0.290   0.328
以12号灯与一个可比较的标准RGB灯相比达到了13%的校正的亮度增加。在图2中示出了该灯的测量光谱。对此Y轴和X轴表明相对的能量或者以nm为单位的波长。
对于本发明另外实施例的下面阐述涉及图3a-3c。
在此以与第一实施例相反的顺序涂敷所述两种荧光物质成分,也就是说“外部的”、关于放电介质的第一荧光物质层7由蓝色荧光物质成分BaMgAl10O16:Eu。“内部的”、关于放电介质的第二荧光物质层6由黄色荧光物质成分YAG:Ce制成。就这种灯类型II以不同的、蓝色和黄色荧光物质层厚比例生产了多个试验灯。在下面的表中列举了因此获得的色品位置的坐标(按照CIE标准比色图表)。对此象通常一样通过相应的层重表示层厚。
  灯号   层7(mg/cm<sup>2</sup>)   层6(mg/cm<sup>2</sup>)   比例、层6/7   x   y
  13   3.20   0.36   0.11   0.201   0.182
  14   3.36   0.39   0.12   0.209   0.195
15 3.39 0.45 0.13 0.209 0.194
16 3.34 1.00 0.30 0.276 0.300
  17   3.39   1.00   0.29   0.287   0.312
  18   3.27   0.88   0.27   0.275   0.296
另一个实施例涉及由两个前面的实施例制成的灯的变体(没有示出),当然具有仅仅一个荧光物质层,在该层中混合蓝色荧光物质成分BaMgAl10O16:Eu(BAM)和黄色荧光物质成分YAG:Ce(YAG)。
就这种灯类型III同样以不同的、蓝色和黄色荧光物质比例生产多个试验灯。在下面的表中列举了因此获得的色品位置的坐标(按照CIE标准比色图表)
  灯号   层(mg/cm<sup>2</sup>)   比例BAM/YAG   x   y
  19   3.18   95/5   0.194   0.174
  20   3.27   95/5   0.198   0.183
  21   3.27   85/15   0.283   0.310
  22   3.32   85/15   0.288   0.317
  23   3.14   85/15   0.284   0.311
  24   3.36   75/25   0.337   0.383
  25   3.22   75/25   0.329   0.373
  26   3.09   75/25   0.327   0.370
下面的表指出了在持续照明100或者500小时后上述实施例的试验灯的保持数据一览表。正如看到的,所有三种类型(I、II、III)的两带灯与所比较的传统三带结构(RGB)相比表明提高的色品位置稳定性,其中这种结构、在该结构中蓝色荧光物质层朝向放电(类型II)、虽然具有最高的光通量减少,可是同时具有最高的色品位置稳定性。
Figure C20041004858100091
虽然前面例举管状放电灯的例子阐述本发明。但本发明仍然不局限于这种灯类型。更确切地说,本发明不依赖于放电容器的形状发挥其有益的作用。因此比如在文献US-A 5994849中公开的平面灯形式同样适合。此外,原则上这是无关紧要的,即,电极是否布置在放电容器壁的外侧或可选择地布置在内侧并以介电层覆盖。同样电极也可以是完全无阻碍的。结合开始概括的问题起决定性作用的是,仅仅放电介质在灯工作中发出VUV辐射。然而介电障碍放电灯在这点上有一定的优先地位,正如开始已经提到的,因为在一个特殊的脉冲工作方式中能够产生特别高效的VUV辐射。

Claims (12)

1.放电灯(1;1’),该放电灯具有
·一个放电容器(2;2’),
·一种放电介质,该放电介质处在放电容器(2;2’)的内部并且在灯工作时在波长小于200nm的VUV范围内发出电磁辐射,
·涂敷在放电容器(2;2’)的壁上的一种荧光物质(4-7),其特征在于,
·所述荧光物质(4-7)由一种黄色和一种蓝色荧光物质成分制成,以一个各自独立的荧光物质层、也就是说以一种黄色荧光物质层(5;6)和蓝色荧光物质层(4;7)涂敷所述两种荧光物质成分。
2.按照权利要求1所述的放电灯,其中荧光物质层(4;5)的顺序是这样的,即从放电介质向外首先是黄色荧光物质层(5),然后是蓝色荧光物质层(4)。
3.按照权利要求1或2所述的放电灯,其中所述两种荧光物质层(4、5)涂敷在放电容器(2)的内壁上。
4.按照权利要求3所述的放电灯,其中蓝色荧光物质层(4)涂敷在黄色荧光物质层(5)的下面。
5.按照权利要求1所述的放电灯,其中所述两种荧光物质层(6、7)涂敷在放电容器(2’)的壁的内侧面上,并且在这种情况下如此选择“外部的”蓝色荧光物质层(7)的厚度,使得“内部的”黄色荧光物质层(6)通过蓝色荧光物质层(7)基本上完全不受VUV辐射的影响。
6.按照权利要求5所述的放电灯,其中黄色荧光物质层(6)涂敷在蓝色荧光物质层(7)的下面。
7.按照权利要求1或2所述的放电灯,具有黄色荧光物质成分(Y,Gd,Tb)AG:Ce。
8.按照权利要求1或2所述的放电灯,具有蓝色荧光物质成分BaMgAl10O17:Eu。
9.按照权利要求1或2所述的放电灯,具有蓝色荧光物质成分SrMgAl10O17:Eu。
10.按照权利要求1或2所述的放电灯,具有蓝色荧光物质成分(Ba,Sr)MgAl10O17:Eu。
11.按照权利要求1或2所述的放电灯,其中放电介质包含惰性气体氙。
12.按照权利要求1或2所述的放电灯,该放电灯是介电障碍放电灯。
CNB2004100485812A 2003-06-13 2004-06-14 具有两带荧光物质的放电灯 Expired - Fee Related CN100431091C (zh)

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