Dynamics of Charges in Superlong Blacklight-Emitting CaB2O4:Ce3+ Persistent Phosphor
Dynamics of Charges in Superlong Blacklight-Emitting CaB2O4:Ce3+ Persistent Phosphor
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DOI：
10.1021/acs.jpcc.9b02210
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发表时间：
2019-05
期刊：
影响因子：
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通讯作者：
Suchinder K. Sharma;Marco Bettinelli;I. Carrasco;J. Beyer;R. Gloaguen;J. Heitmann
中科院分区：
文献类型：
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作者：
Suchinder K. Sharma;Marco Bettinelli;I. Carrasco;J. Beyer;R. Gloaguen;J. Heitmann
研究了CaB_2O_4：Ce ~（3+）荧光粉的光学和余辉性质。在250-340 nm波长范围内激发的光发射主要由365和460 nm的两个带支配。寿命测量表明，365 nm的发射带是由于互组态Ce 3 + 5d → 4f跃迁。在用254 nm UV灯激发时，观察到UVA 1区域（340-400 nm，黑光）中的超长持续发光，持续至少15 h，并且具有优异的再现性，其完全适合于光疗应用。采用初始上升法测定了样品的热释光发光曲线，确定了陷阱分布和陷阱深度。结果表明，CaB_2O_4：Ce ~（3+）荧光粉中存在一个独特的陷阱，其激活能为0.52 eV，是导致其持续发光的唯一原因。其他陷阱有一个准连续的分布，激活能在0.56和1.15 eV之间。提出的持久发光和…
The optical and persistent luminescence properties of CaB2O4:Ce3+ phosphor are presented. The optical emission for excitation in the 250–340 nm wavelength region is dominated by two bands at 365 and 460 nm. Lifetime measurements suggested that the 365 nm emission band is due to interconfigurational Ce3+ 5d → 4f transitions. Upon excitation with a 254 nm UV lamp, a superlong persistent luminescence in the UVA1 region (340–400 nm, blacklight) was observed, lasting for at least 15 h, and with excellent reproducibility, which is perfectly suitable for phototherapy application. The initial-rise method was applied on the thermoluminescence glow curves to determine the trap distribution and trap depth. The results suggest that one distinct trap, with an activation energy of ∼0.52 eV, was solely responsible for the persistent luminescence in the CaB2O4:Ce3+ phosphor. The other traps had a quasi-continuous distribution, with activation energies between 0.56 and 1.15 eV. The proposed persistent luminescence and the...