采用溶胶凝胶‐燃烧法制备了SrMgAl10 O17∶Eu2＋，Mn2＋（SAM ∶Eu2＋、Mn2＋）高效蓝绿双峰荧光粉，并利用X射线衍射仪（XRD）、荧光光谱仪（PL ）、场发射扫描电子显微镜（FE‐SEM ）和 EDX 能谱分析仪（EDS ）等测试手段对所得样品进行表征。结果表明，Eu2＋、Mn2＋共掺杂的SAM 荧光粉颗粒长度约为1μm，产物结晶度高，形貌规则，且均匀性好。随着M n2＋的掺入，发射光谱出现了双峰，分别为465 n m的蓝光和515 n m的绿光。当M n2＋掺杂浓度达到11％时，对应515 n m 的绿光发射光谱峰值达到最大值， E u2＋→M n2＋间的能量传递也达到饱和。与传统燃烧法相比，溶胶凝胶‐燃烧法提高了荧光粉的猝灭浓度，且增强了荧光强度。还以Dex ter能量传递理论为依据，通过能量转移效率和临界距离的计算，对体系中存在的能量传递机制进行了讨论。此外，与单独掺杂Eu2＋的SAM 相比，Eu2＋、Mn2＋共掺的SAM 荧光粉具有较好的热稳定性。
A phase‐pure and high‐efficiency double‐band phosphor ,Eu2+‐Mn2+ co‐doped SrMgAl10 O17 (SAM ) was prepared through the sol‐gel combustion method .The crystal structure and luminescent properties of the SAM were investigated .The XRD results showed that SAM :Eu2+ ,Mn2+ phosphors were well‐crystallized , and the SEM results indicated that these powders consisted of well‐dispersed and uniform particles (about 1μm in length) .With the increase of Mn2+ concentration ,the emission spectrum displayed double peaks centered at 465 and 515 nm ,respectively .The energy transfer mechanism was proposed to be the dipole‐quadrupole interac‐tion .Moreover ,the Mn2+‐codoped sample had the higher thermal stability than that of the sample solely doped with Eu2+ .
参考文献
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%