期刊
DALTON TRANSACTIONS
卷 48, 期 29, 页码 11052-11062出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9dt01384a
关键词
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资金
- National Natural Science Funds of China [51672115, 51372105]
- Gansu Province Development and Reform Commission
- Chengguan District, Lanzhou City Science and Technology Development Projects [2017-2-2]
In this work, we designed and successfully synthesized a novel germanate-based persistent luminescence (PersL) phosphor host, CaMgGe2O6, via a solid-state reaction. We constructed an empirical energy level scheme of the CaMgGe2O6:Ln(2+)/Ln(3+) phosphors according to the Dorenbos model. Then, we successfully theoretically predicted the choice of the optimal codopant of CaMgGe2O6:Mn2+ phosphors using this empirical energy level scheme. As a result, after co-doping with Sm3+, the PersL intensity is increased 16 times and the time duration is effectively improved 52 times due to the high concentration of new traps. CaMgGe2O6:Mn2+,Sm3+ shows red to near-infrared long persistent emission located at 675 nm, which can be sustained for about 60 minutes above the recognizable intensity level (>= 0.32 mcd m(-2)), and the persistence duration of samples was three times that of the red commercial phosphor Y2O2S:Eu3+. The experimental results coincide well with the theoretical predictions. These results demonstrate that the strategy concepts of this work are feasible for the design of persistent luminescence materials. Moreover, a possible afterglow mechanism is studied and discussed with the assistance of thermoluminescence (TL) curves.
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