CN110105948B - 一种红色上转换发光材料及其制备方法 - Google Patents

一种红色上转换发光材料及其制备方法 Download PDF

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CN110105948B
CN110105948B CN201910516199.6A CN201910516199A CN110105948B CN 110105948 B CN110105948 B CN 110105948B CN 201910516199 A CN201910516199 A CN 201910516199A CN 110105948 B CN110105948 B CN 110105948B
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相国涛
刘小桐
周贤菊
李丽
唐笑
江莎
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Changchun Yuheng Era Photoelectric Technology Co ltd
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Abstract

本发明公开了一种红色上转换发光材料,其特征在于,所述材料化学通式为CaY2‑x‑ yYbxEryO4,其中0<x≤0.5,0<y≤0.1。本发明还公开了所述材料的制备方法,采用高温固相法合成了CaY2‑x‑yYbxEryO4材料,制备方法简单,并且材料性能稳定,具有良好的温度响应效果。

Description

一种红色上转换发光材料及其制备方法
技术领域
本发明属于发光材料领域,具体涉及一种红色上转换发光材料及其制备方法。
背景技术
斯托克斯定律认为材料只能受到高能量的光激发,发出低能量的光,但是后来人们发现,其实有些材料可以实现与上述定律正好相反的发光效果,称为反斯托克斯发光,又称上转换发光(Up-Conversion),它是一类重要的稀土发光材料。
近年来,上转换发光材料引起了人们的广泛关注。光致发光材料中,吸收两个或多个较低能量的光子后产生一个高能光子发射的发光材料被定义为上转换发光材料(简称UCPs)。这种材料的上转换现象本质是反斯托克斯效应,即辐射的能量大于所吸收的能量。上转换发光材料可以有效降低光致电离作用引起基质材料衰退,不需要严格的相位配对,而且输出波长具有一定的可调谐性。
准确、快速的温度测量在医疗、炼油、煤矿等各个领域都具有重要意义。在各种温度检测方法中,光学测温具有非接触、响应快、抗干扰能力强等优点,是一种非常有前景的测量方法。最近,稀土离子掺杂的上转换材料更是成为了研究光学测温的热点。目前,使用较多的方法是选择两个不同峰位的发光强度的比值变化来指示温度的改变程度(即荧光强度比)。这种强度比值的方法能够有效地减少来自激发光源的强度变化和周围环境的其他因素(气体扰动,空气因灰尘或者水蒸气等)引起的成分改变所带来的测量误差。
然而,目前大多数利用荧光强度比方法进行测温的上转换材料多以绿色发光为主,即利用绿光进行测温,严重影响了其在生物领域的应用。众所周知,生物组织的光学窗口处于600nm-1100nm,因此开发处于此范围内的光学测温材料不仅可以提高其在生物组织中的穿透深度,还可以提高测温的准确程度。因此,获取具有高效红光发射的上转换光学测温材料对于其在生物领域的应用具有重要意义。
CN 107523297 A公开了一种上转换红色发光粉及其制备方法,该上转换红色发光粉为稀土掺杂钙稳定氧化锆上转换红色发光粉,其化学式为ZrCa0.06YbyErzO2.06+1.5(y+z)。其是通过Ca2+离子对稀土离子Yb3+,Er3+共掺杂的氧化锆进行稳定,从其公开的制备方法来看,其采用液相共沉淀、高温煅烧以及球磨的结合的制备方法,相较于繁琐复杂。
发明内容
针对上述现有技术存在的问题,本发明的目的在于提供一种高灵敏度且可快速响应的红色上转换光学材料,并用于测温,以满足其在生物领域应用的需求。
为实现上述发明目的,本发明所公开技术方案具体为:
1、一种红色上转换发光材料,,所述材料化学通式为CaY2-x-yYbxEryO4,其中0<x≤0.5,0<y≤0.1。
进一步,所述材料在红外光激发下,可见区的发射光谱范围为500-700nm。
进一步,所述材料在红外光激发下,红外区的发射光谱范围为1400-1700nm。
进一步,所述材料在红外光激发下在661nm处的红色荧光与在564nm处的绿色荧光的发光强度比R可通过调节Yb和Er的含量在0<R≤50范围内连续调节。
进一步,所述材料为CaY1.86Yb0.1Er0.04O4,所述材料在红外光激发下,其R1与R2随温度改变而呈现规律性的变化,其中R1表示648nm处的发射峰强度与661nm处的发射峰强度的比值,R2为1476nm处的发射峰强度与1534nm处的发射峰强度的比值。
2、所述一种红色上转换发光材料制备方法,其特征在于,包括如下步骤:
1)按照化学组成CaY2-x-yYbxEryO4中各元素的化学计量比,其中0<x≤0.5,0<y≤0.1,分别称取含有Ca2+的化合物及相应的稀土氧化物,研磨并混合均匀;
2)将步骤1)所得混合物放入高温箱式炉中,在1400℃-1700℃下保温4-6小时;
3)待温度降至室温后,取出样品进行研磨,得到红色上转换发光材料。
进一步,步骤1)所述含有Ca2+的化合物为CaCO3或Ca(HCO3)2,所述相应的稀土氧化物包括Y2O3、Yb2O3以及Er2O3
3、一种红色上转换发光材料在光学测温领域中的应用。
本发明有益效果在于:
通过采用本发明所述方案,所制备的发光材料在红外光激发下,其R1(648nm处的发射峰强度与661nm处的发射峰强度的比值)与R2(1476nm处的发射峰强度与1534nm处的发射峰强度的比值)随温度改变而呈现规律性的变化。建立了两种模式下的发射强度比值随温度变化的关系并拟合得到相关方程,这两种光学测温模式均具有良好的温度响应效果。并且本发明采用高温固相法合成了CaY2-x-yYbxEryO4材料,制备方法简单,并且材料性能稳定。
附图说明
图1为本发明实施例1-10的X-射线粉末衍射图谱;
图2为本发明实施例9中材料在980nm激发下,测得不同温度下的可见区发射光谱,并拟合出其发光强度比值与温度之间的关系方程;
图3为本发明实施例9中材料在可见区测温的绝对灵敏度SA及相对灵敏度SR
图4为本发明实施例9中材料在980nm激发下,测得不同温度下的红外区发射光谱,并拟合出其发光强度比值与温度之间的关系方程;
图5为本发明实施例9中材料在红外区测温的绝对灵敏度SA及相对灵敏度SR
具体实施方式
下面将结合说明书附图和具体实施例对本发明所述技术方案做进一步描述:
实施例1
按化学式CaY1.79Yb0.2Er0.01O4中各元素的化学计量比,分别称取0.2002g CaCO3、0.8084gY2O3,0.1576gYb2O3和0.0077g Er2O3,置于玛瑙研钵中,充分研磨30min混合均匀后装入刚玉坩埚中,将刚玉坩埚放入箱式炉中高温焙烧反应,具体升温程序如下:用5小时的时间从室温升温到1500℃,保温4小时,随后自然冷却到室温。将样品取出研磨得到产物,其化学组成表达式为:CaY1.79Yb0.2Er0.01O4
实施例2
按化学式CaY1.78Yb0.2Er0.02O4中各元素的化学计量比,分别称取0.2002g CaCO3、0.8039gY2O3,0.1576gYb2O3和0.0153g Er2O3,置于玛瑙研钵中,充分研磨30min混合均匀后装入刚玉坩埚中,将刚玉坩埚放入箱式炉中高温焙烧反应,具体升温程序如下:用5小时的时间从室温升温到1500℃,保温4小时,随后自然冷却到室温。将样品取出研磨得到产物,其化学组成表达式为:CaY1.78Yb0.2Er0.02O4
实施例3
按化学式CaY1.77Yb0.2Er0.03O4中各元素的化学计量比,分别称取0.2002g CaCO3、0.7994gY2O3,0.1576gYb2O3和0.0230g Er2O3,置于玛瑙研钵中,充分研磨30min混合均匀后装入刚玉坩埚中,将刚玉坩埚放入箱式炉中高温焙烧反应,具体升温程序如下:用5小时的时间从室温升温到1500℃,保温4小时,随后自然冷却到室温。将样品取出研磨得到产物,其化学组成表达式为:CaY1.77Yb0.2Er0.03O4
实施例4
按化学式CaY1.76Yb0.2Er0.04O4中各元素的化学计量比,分别称取0.2002g CaCO3、0.7949gY2O3,0.1576gYb2O3和0.0306g Er2O3,置于玛瑙研钵中,充分研磨30min混合均匀后装入刚玉坩埚中,将刚玉坩埚放入箱式炉中高温焙烧反应,具体升温程序如下:用5小时的时间从室温升温到1500℃,保温4小时,随后自然冷却到室温。将样品取出研磨得到产物,其化学组成表达式为:CaY1.76Yb0.2Er0.04O4
实施例5
按化学式CaY1.75Yb0.2Er0.05O4中各元素的化学计量比,分别称取0.2002g CaCO3、0.7903gY2O3,0.1576gYb2O3和0.0383g Er2O3,置于玛瑙研钵中,充分研磨30min混合均匀后装入刚玉坩埚中,将刚玉坩埚放入箱式炉中高温焙烧反应,具体升温程序如下:用5小时的时间从室温升温到1500℃,保温4小时,随后自然冷却到室温。将样品取出研磨得到产物,其化学组成表达式为:CaY1.75Yb0.2Er0.05O4
实施例6
按化学式CaY1.74Yb0.2Er0.06O4中各元素的化学计量比,分别称取0.2002g CaCO3、0.7858gY2O3,0.1576gYb2O3和0.0459g Er2O3,置于玛瑙研钵中,充分研磨30min混合均匀后装入刚玉坩埚中,将刚玉坩埚放入箱式炉中高温焙烧反应,具体升温程序如下:用5小时的时间从室温升温到1500℃,保温4小时,随后自然冷却到室温。将样品取出研磨得到产物,其化学组成表达式为:CaY1.74Yb0.2Er0.06O4
实施例7
按化学式CaY1.95Yb0.01Er0.04O4中各元素的化学计量比,分别称取0.2002g CaCO3、0.8807g Y2O3,0.0079g Yb2O3和0.0306g Er2O3,置于玛瑙研钵中,充分研磨30min混合均匀后装入刚玉坩埚中,将刚玉坩埚放入箱式炉中高温焙烧反应,具体升温程序如下:用5小时的时间从室温升温到1500℃,保温4小时,随后自然冷却到室温。将样品取出研磨得到产物,其化学组成表达式为:CaY1.95Yb0.01Er0.04O4
实施例8
按化学式CaY1.91Yb0.05Er0.04O4中各元素的化学计量比,分别称取0.2002g CaCO3、0.8626g Y2O3,0.0394g Yb2O3和0.0306g Er2O3,置于玛瑙研钵中,充分研磨30min混合均匀后装入刚玉坩埚中,将刚玉坩埚放入箱式炉中高温焙烧反应,具体升温程序如下:用5小时的时间从室温升温到1500℃,保温4小时,随后自然冷却到室温。将样品取出研磨得到产物,其化学组成表达式为:CaY1.91Yb0.05Er0.04O4
实施例9
按化学式CaY1.86Yb0.1Er0.04O4中各元素的化学计量比,分别称取0.2002g CaCO3、0.8400gY2O3,0.0788gYb2O3和0.0306g Er2O3,置于玛瑙研钵中,充分研磨30min混合均匀后装入刚玉坩埚中,将刚玉坩埚放入箱式炉中高温焙烧反应,具体升温程序如下:用5小时的时间从室温升温到1500℃,保温4小时,随后自然冷却到室温。将样品取出研磨得到产物,其化学组成表达式为:CaY1.86Yb0.1Er0.04O4
实施例10
按化学式CaY1.66Yb0.3Er0.04O4中各元素的化学计量比,分别称取0.2002g CaCO3、0.7497gY2O3,0.2364gYb2O3和0.0306g Er2O3,置于玛瑙研钵中,充分研磨30min混合均匀后装入刚玉坩埚中,将刚玉坩埚放入箱式炉中高温焙烧反应,具体升温程序如下:用5小时的时间从室温升温到1500℃,保温4小时,随后自然冷却到室温。将样品取出研磨得到产物,其化学组成表达式为:CaY1.66Yb0.3Er0.04O4
参见附图1,它是实施例1~10所述技术方案制备样品的X射线粉末衍射图谱,XRD测试结果显示,所制备相应材料为单相材料,没有其它杂相存在,而且结晶度较好。
进一步选取实施例9中样品,在980nm激发下,通过测得不同温度下的可见区及红外区发射光谱,并拟合出其发光强度比值与温度之间的关系方程,依次示于图2和图4中。通过发光强度比值和温度的关系,得到绝对灵敏度和相对灵敏度与温度的关系,依次示于图3和图5中,发现该材料对温度响应的灵敏度较高。
由附图2~5进一步印证了本实施例所制备的发光材料在红外光激发下,其R1(648nm处的发射峰强度与661nm处的发射峰强度的比值)与R2(1476nm处的发射峰强度与1534nm处的发射峰强度的比值)随温度改变而呈现规律性的变化。建立了两种模式下的发射强度比值随温度变化的关系并拟合得到相关方程,这两种光学测温模式均具有良好的温度响应效果。
最后说明的是,以上对本发明的具体实施方式作了详细说明,但是本发明并不限于上述实施方式,在本领域普通技术人员所具备的知识范围内,还可以在不脱离本发明宗旨的前提下作出各种变化。

Claims (5)

1.一种红色上转换发光材料,其特征在于,所述材料化学通式为CaY2-x-yYbxEryO4,其中x=0.1,y=0.04;
所述材料为CaY1.86Yb0.1Er0.04O4,所述材料在红外光激发下,其R1与R2随温度改变而呈现规律性的变化,其中R1表示648nm处的发射峰强度与661nm处的发射峰强度的比值,R2为1476nm处的发射峰强度与1534nm处的发射峰强度的比值。
2.根据权利要求1所述一种红色上转换发光材料,其特征在于,所述材料在红外光激发下,可见区的发射光谱范围为500-700nm。
3.根据权利要求1所述一种红色上转换发光材料,其特征在于,所述材料在红外光激发下,红外区的发射光谱范围为1400-1700nm。
4.权利要求1~3任一项所述一种红色上转换发光材料制备方法,其特征在于,包括如下步骤:
1)按照化学组成CaY2-x-yYbxEryO4中各元素的化学计量比,其中x=0.1,y=0.04,分别称取含有Ca2+的化合物及相应的稀土氧化物,研磨并混合均匀;
2)将步骤1)所得混合物放入高温箱式炉中,在1400℃-1700℃下保温4-6小时;
3)待温度降至室温后,取出样品进行研磨,得到红色上转换发光材料。
5.根据权利要求4所述一种红色上转换发光材料制备方法,其特征在于,步骤1)所述含有Ca2+的化合物为CaCO3或Ca(HCO3)2,所述相应的稀土氧化物包括Y2O3、Yb2O3以及Er2O3
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