Mn2+ activated green, yellow, and red long persistent phosphors
Mn2+ activated green, yellow, and red long persistent phosphors
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DOI：
10.1016/s0022-2313(02)00541-0
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发表时间：
2003-05-01
影响因子：
3.6
通讯作者：
Yen, WM
中科院分区：
文献类型：
--
作者：
Wang, XJ;Jia, DD;Yen, WM
制备了Mn~（2+）激活的CaAl_2O_4：Mn~（2+），Ce~（3+），Ca_2Al_2SiO_7：Mn~（2+），Ce~（3+）和MgSiO_3：Mn~（2+），Eu~（2+），Dy~（3+）长余辉发光材料。在该体系中观察到绿色、黄色和红色的长余辉，绿色（525 nm）和黄色（550 nm）的余辉时间超过10 h，红色（660 nm）的余辉时间超过4 h。发射光谱和激发光谱表明，Mn~（2+）离子在这些材料中的发射占主导地位。在没有Mn 2+作为共掺杂剂的系统中也测量了长持续磷光。由于Ce 3+和Eu 2+的5d-4f跃迁而不是Mn 2+的3d-3d跃迁，发射更强。当Mn~（2+）共掺杂时，长余辉消失，说明存在一种非线性的发光机制。Ce~（3+）和Eu~（2+）向Mn~（2+）的能量转移。(C)2002 Elsevier Science B.V.保留所有权利。
Mn2+ activated long persistent phosphors, CaAl2O4:Mn2+, Ce3+, Ca2Al2SiO7:Mn2+, Ce3+ and MgSiO3:Mn2+ Eu2+, Dy3+, were prepared. Long persistent phosphorescence in green, yellow, and red have been observed in the systems with persistence time over 10 h for the green (525 nm) and the yellow (550 nm) and 4 h for the red (660 nm). Emission and excitation spectra showed that Mn2+ emission was dominant in these materials. Long persistent phosphorescence was also measured in the systems without Mn2+ as a co-dopant. The emissions were much stronger due to 5d-4f transitions in Ce3+ and Eu2+ other than 3d-3d transitions in Mn2+. The disappearances of the long persistent afterglow in these systems when co-doped with Mn2+ suggested the existence of a. strong, persistent energy transfer from Ce3+ and Eu2+ to Mn2+. (C) 2002 Elsevier Science B.V. All rights reserved.