Vacuum Referred Binding Energy (VRBE)-Guided Design of Orange Persistent Ca3Si2O7:Eu2+ Phosphors
Vacuum Referred Binding Energy (VRBE)-Guided Design of Orange Persistent Ca3Si2O7:Eu2+ Phosphors
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DOI：
10.1021/acs.inorgchem.7b01214
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发表时间：
2017-09-04
影响因子：
4.6
通讯作者：
Tanabe, Setsuhisa
中科院分区：
文献类型：
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作者：
Ueda, Jumpei;Maki, Ryomei;Tanabe, Setsuhisa
通过共掺杂Sm3+或Tm3+，制备了Eu2+掺杂Ca3Si2O7 （CSO）的橙色持久性荧光粉。首先，利用实测光谱数据构建Ca3Si2O7 （CSO）的真空参考结合能（VRBE）图。根据VRBE图中二价镧系离子的锯齿形曲线，预测Sm3+和Tm3+离子是适合持续发光的电子阱。CSO:Eu2+-Sm3+和CSO:Eu2+-Tm3+的初始持续亮度分别比CSO:Eu2+强290倍和9300倍。通过优化Eu2+和Tm3+的浓度，CSO:Eu2+-Tm3+在0.32 mcd/m(2)下的持续发光时间达到约50 min。从VRBE图和持续发光特性出发，讨论了其持续发光机理，包括充电过程、脱陷过程和电子俘获中心。
Orange persistent phosphors of Ca3Si2O7 (CSO) doped with Eu2+ were strategically developed by codoping Sm3+ or Tm3+. First, a vacuum referred binding energy, VRBE, diagram of Ca3Si2O7 (CSO) was constructed from the measured spectroscopic data. By the zigzag curve of the divalent lanthanide ions in the VRBE diagram, Sm3+ and Tm3+ ions were predicted to be a suitable electron trap for the persistent luminescence. The initial persistent luminance of CSO:Eu2+-Sm3+ and CSO:Eu2+-Tm3+ was found to be 290 times and 9300 times stronger, respectively, compared with CSO:Eu2+. By optimizing Eu2+ and Tm3+ concentrations, the persistent luminescence duration on 0.32 mcd/m(2) reached approximately 50 min in CSO:Eu2+-Tm3+. From the VRBE diagram and the presistent luminescence properties, we discuss the persistent mechanism including the charging process, detrapping process, and electron trapping centers.