CN1262303A - 发光材料及其制备方法 - Google Patents

发光材料及其制备方法 Download PDF

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CN1262303A
CN1262303A CN99100285.7A CN99100285A CN1262303A CN 1262303 A CN1262303 A CN 1262303A CN 99100285 A CN99100285 A CN 99100285A CN 1262303 A CN1262303 A CN 1262303A
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luminescent material
complex phase
compound
phase compound
material according
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CN1149274C (zh
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郝庆隆
李鹏程
徐谦
小椋厚
高景峰
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Beijing Hualong Yayang Technical Development Co ltd
Kaimi Co.,Ltd. Governor Nozhong
Chemitech Inc
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HONGYE YAYANG FLUORESCENT MATERIALS FACTORY BEIJING
Chemitech Inc
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Priority to CNB991002857A priority Critical patent/CN1149274C/zh
Priority to DE60024033T priority patent/DE60024033T2/de
Priority to PCT/JP2000/000402 priority patent/WO2000044852A1/ja
Priority to AT00901921T priority patent/ATE310063T1/de
Priority to EP00901921A priority patent/EP1094102B1/en
Priority to AU23195/00A priority patent/AU772614B2/en
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    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09KMATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/08Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
    • C09K11/77Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
    • C09K11/7783Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing two or more rare earth metals one of which being europium
    • C09K11/7792Aluminates
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09KMATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/08Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
    • C09K11/77Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
    • C09K11/7783Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing two or more rare earth metals one of which being europium
    • C09K11/7797Borates

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  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Luminescent Compositions (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Glass Compositions (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)

Abstract

本发明公开一种发光材料及其制备方法。发光材料含复相化合物,其化学式为(Sr,Eu,Dy)0.95±x(Al,B)2O3.95±x·(Sr,Eu,Dy)4-x(Al,B)14O25-x,式中x为0.01—0.1,B含量为0.2—1.0wt%,Eu为0.5—3.0wt%,Dy为0.01—3.0wt%。制备方法包括:使定量研磨过的原料混合均匀;还原条件下加热,控制850℃—1200℃间加热3小时,再保温5—6小时,冷却。发光材料余辉时间长,适合涂覆欲在黑暗中显示其位置的器件上,如消防器材。

Description

发光材料及其制备方法
本发明涉及发光材料及其制备方法,更具体地说,涉及以稀土元素作激活剂的长余辉无机发光材料及其制备方法。
发光材料可混入油墨或涂料中制成发光涂料,用在安全标志或钟表盘上。过去多用铜激活的硫化锌(ZnS∶Cu)作发光材料。尽管ZnS∶Cu在其发射光谱区内有较高的发光效率,但是它的辉度降低得非常迅速,凭人眼觉察的余辉时间仅有20-30分钟。如果将其暴露在潮湿环境的UV照射下时,还会发生分解变质,使该材料的体色变暗,所以ZnS∶Cu的户外使用受到极大的限制。人们一直在努力寻求ZnS∶Cu的最佳替代产品。
CN1053807A公开了一种长余辉的发光材料,其表达式为
m(Sr1-XEuX)O·nAl2O3·yB2O3
式中1≤m≤5,1≤n≤8,0.005≤y≤0.35,0.001≤x≤0.1。
这种发光材料的余辉时间在10-20小时之间。
US5,376,303公开了一种长余辉的磷光体。该磷光体是一种组合物,其组合物的表达式为:
      MO.a(Al1-bBb)2O3:cR
式中,0.5≤a≤10.0,
      0.0001≤b≤0.5,和
      0.0001≤c≤0.2,MO代表选自MgO、CaO、SrO和ZuO中的至少一种氧化物,R代表Eu和选自Pr、Nd、Dy和Tm中的至少一种附加的稀土元素。
该专利制备出了一些磷光体,其中包括:
SrO.2.10(Al0.952B0.048)2O3:0.005Eu,0.020Dy(以下简称A)和SrO.1.025(Al0.976B0.024)2O3:0.005Eu,0.0155Dy(以下简称B)。为评价其余辉时间和亮度,该专利分别采用余辉时间常数(n)和相对亮度(对比物为ZnS∶Cu,Cl)来表示。测定的结果,A、B磷光体和ZnS∶Cu,Cl的余辉时间常数分别为0.94、0.86和1.26,10秒钟后的磷光亮度分别为144、220和100,而20分钟后的磷光亮度分别为934、1320和100。
从上述专利公布的发光材料余辉时间和亮度数值不难看出,这些材料较ZnS∶Cu,Cl有明显提高,但离实际应用尚有一定距离。
本发明的发明者们,在采用铝酸盐为基质,稀土元素Eu为激活剂制备发光材料方面,曾进行过大量的研究工作。发现在此基础上,加入适量的B和附加激活剂Dy可获得一种新型晶体结构的发光材料,这种材料具有人们要求的长余辉时间和高亮度。
由此,本发明的目的在于提供一种发光材料,该材料具有长余辉、高亮度。
本发明的第二个目的在于提供一种用于制备上述发光材料的方法。
为完成本发明的任务,采用如下技术方案。
一种发光材料,其特征在于该发光材料含复相化合物晶体,其化学式为:(Sr,Eu,Dy)0.95±x(Al,B)2O3.95±x·(Sr,Eu,Dy)4-x(Al,B)14O25-x,式中x为0.01-0.1。
这种复相化合物具有新的晶体结构。它具有物相(Sr,Eu,Dy)0.95±x(Al,B)2O3.95±x和(Sr,Eu,Dy)4-x(Al,B)14O25-x,这一结论是由中国地质大学材料科学系晶体结构与晶体化学研究室通过大量样品的XRD(x射线衍射)分析技术得到的。另外,在XRD的分析基础上,再通过光学显微镜和电子探针分析技术,以充分的理由证实上述两物相是共生的,并且都具有发光功能。
在对本发明发光材料的物相鉴定过程中,还采用了x光荧光分析、等离子光谱分析、电子探针以及x光光电子能谱等分析手段,确定了复相化合物中B元素的重量百分比(wt%)一般为0.2-1.0,Eu和Dy的含量Wt%变化范围为:Eu 0.5-3.0,Dy 0.01-3.0。
元素B在晶体结构中普遍存在。它在晶体中既可能以B-O四面体配位形式存在,又可能以BO3三角形配位形式存在。其中BO3三角形配位有可能替代部分Al-O四面体,使得晶体结构产生不稳定性,这是本发明发光材料的一个重要结构特征。
另外,在本发明的复相化合物的晶体中,Al-O四面体和Al-O八面体同时存在,形成近似的六角环,环的空洞中充填着阳离子Sr、Eu和Dy。就晶体复合化合物整体而言,Al过剩,(Sr,Eu,Dy)缺失。
制备上述发光材料的方法,包括步骤:
(1)称取先经粉碎研磨过的各原料,混合均匀,得混合料;
(2)在还原条件下置混合料于容器中加热,控制850℃-1200℃加热3小时,再保温5-6小时,得烧结体;
(3)停止加热烧结体,自然降温,至室温;
(4)粉碎研磨烧结体,得产品。
用于制备本发明发光材料的原料有SrCO3、Al2O3、H3BO3、Eu2O3和Dy2O3。其中,Eu2O3中的Eu3+在烧结过程中被还原成Eu2+,激活复相化合物使其具有发光性能。Dy2O3作为附加激活剂,用来加强激活剂Eu2O3的作用。
用于本发明中的术语“还原条件”,既指混合料用炭粉还原,又指混合料用体积比为4∶1的氮与氢混合气还原。
制备出的发光材料体色是淡黄绿色的。在太阳光、荧光灯或其他人造光源照射激发下,发射光谱的主峰为505μm,显兰-绿色。对样品测试结果表明,本发明的发光材料在停止光源照射后5秒钟,能显示接近8500mcd/m2的辉度。可视余辉时间在80小时以上,见表1。由表1不难看出按本发明方法制备的发光材料在可视余辉时间上是优异的。
上述辉度的测定方法为:
把0.2g的试料放入10mm直径的塑料盘中,在室温和25RH%湿度下,用15w荧光灯垂直距离20cm照射15分钟,用辉度计(TOPCONBM-5,日本TOPCON株式会社制)测量各试样在各时间点的辉度。
由于依据本发明方法制备的发光材料,在余辉时间上明显长于其他同类产品,所以本发明的发光材料更适于涂覆在停止照明或黑夜中有必要显示其位置的物品或安全标志上,如消防器材的消火栓、安全通道楼梯扶手、道路等。
举出以下实施例,仅为进一步说明本发明,而不是对本发明作任何的限制。实施例1
分别称取已经过粉碎研磨的SrCO3372.89g,Al2O3220.32g,H3BO312.616g,Eu2O32.42g,和Dy2O30.157g,充分混合均匀。
把混合原料放入一容器内,用炭粉覆盖,升温,用3小时从850℃升至1200℃,再保温6小时,自然降温,至室温,粉碎研磨烧结体至全部通过200目筛,得产品。
所得产品30秒钟的初始辉度为3850mcd/m2,余辉时间为85小时。
所得产品化学式中的x=0.01。实施例2
分别称取已经过粉碎研磨的SrCO3409.79g,Al2O3220.32g,H3BO312.616g,Eu2O32.96g,和Dy2O30.164g,充分混合均匀。
把混合好的原料放入容器内,用炭粉覆盖,升温,用3小时从850℃升至1000℃,再保温6小时,自然降温,至室温,粉碎研磨烧结体至全部通过200目筛,得产品。
所得产品30秒钟的初始辉度为3990mcd/m2,余辉时间为80小时。所得产品化学式中的x=0.1。
表1    辉度(mcd/m2)测量与标差计算
时间     样品号     标差计算
    1     2     3     4     5  平均值   标差   相对标差
    5s   8400   8450   8400   8500   8400   8430    45   0.5%
    10s   7380   7570   7420   7610   7320   7460    125   1.8%
    20s   5120   5130   4930   5170   4870   5044    135   2.7%
    30s   4030   3960   3850   3990   3820   3930    91   2.3%
    40s   3380   3230   3160   3310   3110   3238    110   3.4%
    60s   2550   2490   2430   2490   2420   2476    53   2.1%
    90s   1870   1820   1780   1830   1750   1810    47   2.6%
  3min   1520   1470   1460   1480   1420   1470    36   2.4%
  4min   870   850   840   840   820   844    18   2.1%
  5min   760   740   720   730   700   730    22   3.0%
  6min   630   630   610   610   590   614    17   2.8%
  15min   330   310   300   310   290   308    15   4.9%
  30min   160   150   140   140   130   144    12   8.3%
  60min   70   70   60   60   60   64    5.5   8.6%
  90min   50   40   40   50   40   44    5.5   12.5%
  120mim   40   40   30   40   30   36    5.5   15.3%
  180min   20   30   20   20   20   22    4.5   20.5%
  240min   20   20   10   20   20   18    4.5   25.0%
  360min   20   10   10   20   10   14    5.5   36.6%
  480min   10   10   10   10   10   10    0   0

Claims (7)

1.一种发光材料,该材料含复相化合物晶体,其化学式为(Sr,Eu,Dy)0.95±x(Al,B)2O3.95±x·(Sr,Eu,Dy)4-x(Al,B)14O25-x,式中x为0.01-0.1,B元素含量为0.2-1.0wt%,Eu为0.5-3.0wt%,Dy为0.01-3.0wt%。
2.根据权利要求1所述的发光材料,其特征在于所述复相化合物是由共生物相(Sr,Eu,Dy)0.95±x(Al,B)2O3.95±x和(Sr,Eu,Dy)4-x(Al,B)14O25-x组成的。
3.根据权利要求1所述的发光材料,其特征在于所述复相化合物中,Al-O四面体和Al-O八面体同时存在。
4.根据权利要求1所述的发光材料,其特征在于所述复相化合物中,BO3三角形配位替代部分Al-O四面体。
5.根据权利要求1所述的发光材料,其特征在于所述复相化合物晶体中,硼元素普遍存在。
6.制备权利要求1所述发光材料的方法,包括步骤:
(1)称取先经粉碎研磨过的各原料,混合均匀,得混合料;
(2)在还原条件下置混合料于容器中加热,控制850℃-1200℃加热3小时,再保温5-6小时,得烧结体;
(3)停止加热烧结体,自然降温,至室温;
(4)粉碎研磨烧结体,得产品。
7.根据权利要求6所述的方法,其特征在于所述步骤(2)是用炭粉还原的。
CNB991002857A 1999-01-28 1999-01-28 发光材料及其制备方法 Expired - Fee Related CN1149274C (zh)

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CNB991002857A CN1149274C (zh) 1999-01-28 1999-01-28 发光材料及其制备方法
DE60024033T DE60024033T2 (de) 1999-01-28 2000-01-27 Lichtemitierendes material und methode zur herstellung desselben
PCT/JP2000/000402 WO2000044852A1 (fr) 1999-01-28 2000-01-27 Materiau electroluminescent et procede de preparation dudit materiau
AT00901921T ATE310063T1 (de) 1999-01-28 2000-01-27 Lichtemitierendes material und methode zur herstellung desselben
EP00901921A EP1094102B1 (en) 1999-01-28 2000-01-27 Light-emitting material and method for preparing the same
AU23195/00A AU772614B2 (en) 1999-01-28 2000-01-27 Light-emitting material and method for preparing the same

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CN105862167A (zh) * 2016-04-13 2016-08-17 旷达纤维科技有限公司 一种抗静电/夜光双功能低弹丝的制备方法

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CN100386404C (zh) * 2003-12-23 2008-05-07 Lg化学株式会社 一种新颖的蓝色磷光体及其制备方法
CN105862167A (zh) * 2016-04-13 2016-08-17 旷达纤维科技有限公司 一种抗静电/夜光双功能低弹丝的制备方法

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DE60024033D1 (de) 2005-12-22
EP1094102A4 (en) 2002-08-14
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DE60024033T2 (de) 2006-06-08

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