摘要
摘要
在现代生产生活中，发光材料作为一种人类生产生活离不开的必需品，一
直受到研究人员的探索研究。如作为绿色照明光源的白光LED就因为其轻便易
携带、寿命周期长、发光效率高、易保存、低成本等优点而受到关注。所以优
秀的荧光粉材质是对这些应用方面有着巨大的作用。而过渡金属Cr因其特殊的
电子层结构和相较于稀土元素的昂贵价格，使得它一直在红色荧光粉材料的合
成中占据一席地位。
在本论文中，使用高温固相法和溶胶凝胶-高温固相法分别制备了α-Al2O3:Cr3+荧光材料和Mg0.388Al2.408O4:Cr3+荧光材料。并针对Cr3+离子掺杂浓度、灼烧温度、保温时间等影响因素进行了讨论。最终通过使用X射线衍射
（XRD）、激发光谱、发射光谱、荧光寿命衰减曲线以及色坐标对所合成的样
品进行分析，得如下结论：
（1）在不同浓度的Cr3+的掺杂下，Al2O3:Cr3+荧光材料的XRD与标准卡对比，没有出现变化。浓度的改变会使激发光谱和发射光谱的强度改变而峰位没
有改变，分别为409nm、546nm和693.6nm、694.8nm。在固定掺杂浓度的情况
下，最佳灼烧温度出现在1300℃。在固定掺杂浓度和温度下，最佳保温时间为3h。荧光寿命约为4.32641ms。在1%掺杂浓度下的Al2O3:Cr3+荧光粉的CIE色坐标为(0.7345，0.2657)，该点所处的位置位于红色边界区域内，表明Al2O3:Cr3+荧光粉发射红光，与荧光粉发射峰值位于694.9nm相符合。
（2）通过与标准卡对比，制备成Mg0.388Al2.408O4:Cr3+的样品没有多余的杂相。在407nm的激发光激发下，它可以发射出在670nm到750nm范围的红色和
近红外光。随着Cr3+的掺杂浓度从1%到3%，样品的发射峰位并没有产生改变，
干锅
均在689nm处存在一个强发射峰。Cr3+的最佳掺杂浓度为1%。由689nm的发射
光得到了380nm~450nm和520nm~600nm两个激发带，中心波长分别为407nm
和552nm。荧光寿命约为4.8255ms。色坐标为(0.7343，0.2657)，位于红色边界
边缘处，与荧光粉发射峰值位于688nm相符合。
嘎子嘎关键词：Mg0.388Al2.408O4:Cr3+；Al2O3:Cr3+；Cr掺杂；溶胶凝胶-高温固相法；荧光特性
Abstract
In modern production and life,luminescent materials,as a necessary part of human production and life,have been explored and studied by rearchers.For example,as a green light source,the white LED is concerned becau of its advantages of portability,long life cycle,high luminous efficiency,easy storage,low cost and so on.There are also some light conversion materials can play an important role in agricultural production.So the excellent phosphor material has a great effect on the applications.Becau of its special electronic layer structure and high price compared with rare earth elements,the transition metal Cr has been playing an important role in the synthesis of red phosphors.
In this paper,the high temperature solid state method and sol-gel high temperature solid-state method were ud to prepare the Al2O3:Cr3+fluorescent materials and Mg0.388Al2.408O4:Cr3+fluorescent materials respectively.The influence factors of Cr3+doping concentration,burning temperature and holding time were discusd.Finally,the synthesized samples
were analyzed by X-ray diffraction (XRD),excitation spectrum,emission spectrum,fluorescence lifetime decay curve and color coordinates,and the following conclusions were obtained:营销力
（1）The XRD of Al2O3:Cr3+fluorescent material has no change compared with the standard card under different Cr3+doping concentration.The intensity of the excitation spectrum and the emission spectrum will change with the change of the concentration,but the peak position will not change,which are409nm,546nm, 693.6nm and694.8nm,respectively.Under the condition of fixed doping concentration,the best burning temperature appears at1300℃.The optimum holding time is3h at a fixed doping concentration and temperature.The fluorescence lifetime is about4.32641ms.The CIE coordinate of Al2O3:Cr3+phosphor at1%doping concentration is(0.7345,0.2657).The position of this point is in the red boundary region,which indicates that Al2O3:Cr3+phosphor emits red light,which is consistent with the emission peak of phosphor at694.9nm.
（2）Compared with the standard card,the Mg0.388Al2.408O4:Cr3+sample has no extra heteropha.When excited by407nm excitation light,it can emit red and near-infrared light in the range of670nm to750nm.With the doping concentration of Cr3+from1%to3%,the emission peak position of the samples did not change,and there was a strong emission peak at689nm.The optimum
doping concentration of Cr3+is1%.Two excitation bands,380nm~450nm and520nm~600nm,were obtained from689nm emission light.The central wavelengths were407nm and 552nm,respectively.The fluorescence lifetime is about 4.8255ms.The color coordinates are(0.7343,0.2657),which are located at the edge of the red boundary, which is consistent with the emission peak of the phosphor at688nm. Keywords:Mg0.388Al2.408O4:Cr3+；Al2O3:Cr3+；Cr3+doping;Sol-gel high temperature
solid pha method;Fluorescence characteristics
目录
摘要.............................................................................................................II 目录...........................................................................................................IV 第1章绪论.. (1)
1.1发光材料简介 (1)
1.1.1发光 (1)
1.1.2发光材料简介 (1)
1.2发光材料的合成方法 (4)
1.2.1高温固相法 (4)
1.2.2溶胶-凝胶法（Sol-gel） (6)
仁义礼智1.2.3沉淀法 (8)
1.2.4燃烧法 (8)
1.3发光材料的主要性能指标及表征 (9)
1.3.1激发光谱 (9)
1.3.2发射光谱 (10)
1.3.3荧光寿命 (10)
1.3.4CIE色坐标和色温 (11)
1.3.5发光效率 (12)
读书的重要性和好处
1.3.6量子效率 (12)
1.4发光材料的研究现状 (13)
1.4.1硅酸盐体系发光材料 (13)
1.4.2铝酸盐体系发光材料 (13)
共性与个性1.4.3硫化物体系发光材料 (14)
额头痣1.4.4氧化物体系发光材料 (14)
1.4.5磷酸盐体系发光材料 (15)
1.4.6钨钼酸盐体系发光材料 (15)
1.5本文的主要研究内容及意义 (15)
第2章荧光粉制备实验 (17)
2.1实验试剂和实验设备 (17)
2.1.1实验试剂 (17)
一次精彩的运动会
2.1.2实验设备 (17)
2.2样品的制备 (18)
2.2.1高温固相法制备α-Al2O3:Cr3+荧光粉 (18)
2.2.2溶胶-凝胶法制备Mg0.388Al2.408O4:Cr3+发光材料 (19)
2.3样品的性能测试 (21)
第3章Al2O3:Cr3+荧光粉的光谱特性研究 (26)
3.1前言 (26)
3.2实验结果与讨论 (27)
3.2.1Cr3+离子掺杂浓度对荧光粉发光性能的影响 (27)
3.2.2灼烧温度对荧光粉发光性能的影响 (33)
3.2.3保温时间对荧光粉发光性能的影响 (34)
3.2.4色坐标计算 (36)
3.3本章小结 (37)
第4章Mg0.388Al2.408O4:Cr3+荧光粉的光谱特性研究 (40)
4.1前言 (40)
4.2实验结果及讨论 (40)
4.2.1Mg0.388Al2.408O4:Cr3+荧光粉的物相分析 (40)
4.2.2Mg0.388Al2.408O4:Cr3+荧光粉的发光性能分析 (41)
4.2.3Mg0.388Al2.408（1-x）O4:xCr3+荧光粉的荧光寿命 (43)
4.2.4色坐标 (45)
