两步反应法制备硅基氮氧化物荧光材料SrSi_2O_2N_2:Eu^(2+)及其发光性能研究  

Structure and photoluminescence properties of SrSi_2O_2N_2:Eu^(2+) phosphors prepared by two-step solid state reaction using Sr_2SiO_4:Eu^(2+) as a precursor

作　　者：谢安[1,2] 王宇威[1] 张裕骏[1] 邹凯鹏 

机构地区：[1]厦门理工学院材料科学与工程学院,厦门361024 [2]富顺光电科技股份有限公司,漳州363000

出　　处：《中国科学：物理学、力学、天文学》2014年第7期712-719,共8页Scientia Sinica Physica,Mechanica & Astronomica

基　　金：国家自然科学基金(批准号:11204258);福建省自然科学基金杰出青年(编号:2012J06024);福建省高校杰出青年科研人才培育计划(编号:JA13329);厦门市科技计划(编号:3502Z20123040);教育部人文社科基金(编号:11YJC820135);中国博士后科学基金(编号:2012M521264)资助项目

摘　　要：本文以硅酸盐相Sr2SiO4:Eu2+为前驱体,采用两步反应法制备了一系列单相的氮氧化物荧光粉Sr1?xSi2O2N2:Eu2+x(0.02?x?0.10),详细探讨了SrSi2O2N2:Eu2+荧光粉的反应机制及发光性能.实验结果显示所有样品能被近紫外光(400 nm)和蓝光(450 nm)激发发射出峰值位于535 nm的黄绿光,在Sr2SiO4:Eu2+体系中Eu2+的最佳掺杂浓度值x为0.05,Eu2+之间的能量传递是电偶极-偶极相互作用,Eu2+之间能量传递临界距离Rc=1.507 nm.此外,本文还对样品的发光强度和热稳定性与某商用YAG黄粉作了分析比较,所有结果表明该系列荧光粉可用于白光LED制造.A series of yellow green emitting phosphors nitrogen oxides Sr1-xSrSi2O2N2：Eu^2＋x（0.02≤x≤0.10） were synthesized by a method using SrSi2O2N2：Eu^2＋ as a precursor and their photoluminescence properties and reaction mechanism were investigated in detail. The photoluminescence results show that all samples can be excited efficiently by UV （400 nm） light and blue （450 nm） light and emit yellow green （535 nm） light with line spectra, which are coupled well with the characteristic emission from UV-LED and blue LED, respectively. The experimental results and their analysis suggest that the optimum concentration of Eu^2＋ is 0.05 mol and the energy transfer occurs due to dipole-dipole interactions among Eu^2＋ ions in Sr1-xSrSi2O2N2：Eu^2＋x, the critical distance （Re） of energy transfer was calculated to be about 1.507 nm. Furthermore, the thermal stability and the emission intensity of synthesized SrSi2O2N2：Eu^2＋x phosphor was examined and compared with that of commercial YAG yellow phosphors. All the results indicate that the phosphor is a suitable candidate of yellow green emitting phosphor for the fabrication of white LEDs.

关 键 词：黄绿色荧光粉 氮氧化物 前驱体 白光LED 

分 类 号：O482.31[理学—固体物理]