| (Ca,Me)La4Si3O13:Eu3+(Me=Sr,Ba)荧光粉的结构和发光特性 |
| Structure and Luminescence Properties of Phosphors (Ca, Me)La4Si3O13:Eu3+ (Me=Sr, Ba) |
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| 摘要: 采用高温固相法制备了(Ca,Me)La4Si3O13:Eu3+(Me=Sr, Ba)系列红色荧光体,考察了Eu3+掺杂浓度和Sr2+,Ba2+置换对荧光体结构和发光特性的影响。Eu3+最佳掺杂浓度为nEu3+:nLa3+=1:7,5D0-7F2与5D0-7F1跃迁发射强度比为2.55。Eu3+掺杂使晶胞参数a和c呈线性变小,对c的影响大于a,使a/c比增大。Sr2+和Ba2+分别置换基质中的Ca2+可以形成完全固溶体,晶胞参数随Sr2+或Ba2+的置换量增加呈线性增大,使a/c比减小。各发射峰强度在Sr2+置换量为0.4 mol时出现极大值,但随Ba2+置换量的增加而不断增强,全置换后荧光强度最大。荧光体的色坐标为(0.638 5,0.353 0)。 |
| 关键词: LED 荧光粉 磷灰石 硅酸盐 Eu3+ |
| 基金项目: 国家自然科学基金(No.20771086)资助项目。 |
| Abstract: A series of phosphors (Ca, Me)La4Si3O13:Eu3+ (Me=Sr, Ba) were prepared via solid-state reactions. The variations of lattice parameters and the luminescence properties were investigated based on modifying dopant concentration of Eu3+ and substitution amount of Ca2+ by Sr2+ or Ba2+ in the host. The optimal mole ratio nEu3+ to nLa3+ in the phosphor is 1:7 and the intensity ratio of emission transition 5D0-7F2 to 5D0-7F1 is 2.55 in the studied range. The lattice parameters a and c reduce linearly with concentrations of dopant Eu3+ and c is more noticeable so that a/c value increases. There are linear relationships between lattice parameters and substitution amounts of Sr2+ or Ba2+ to Ca2+ in host, but values of a and c increase and that of a/c decreases due to continuous solid solutions formed. The maximum of the luminescent intensities of Eu3+ emission appears in the sample in which the substitution amount of Sr2+ to Ca2+ is 0.4 mole per mole host, however, the intensities increase with the substitution concentrations of Ba2+ ions all the while,as well as a change in rate of grade at content 0.4 of Ba2+ ion,and the most intensity reaches till whole substitution. The CIE of the sample is (0.638 5, 0.353 0). |
| Keywords: LED phosphor apatite silicate Eu3+ |
| 投稿时间：2012-10-26 修订日期：2013-01-20 |
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| 巩仕星,田一光,张乔,陈立伟,毛培.(Ca,Me)La4Si3O13:Eu3+(Me=Sr,Ba)荧光粉的结构和发光特性[J].无机化学学报,2013,29(6):1192-1198. |
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