Designing a Red Persistent Luminescence Phosphor: The Example of YPO4:Pr3+,Ln3+ (Ln = Nd, Er, Ho, Dy)
Designing a Red Persistent Luminescence Phosphor: The Example of YPO4:Pr3+,Ln3+ (Ln = Nd, Er, Ho, Dy)
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DOI：
10.1021/jp108038v
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发表时间：
2011-02
影响因子：
3.7
通讯作者：
A. Lecointre;A. Bessière;A. Bos;P. Dorenbos;B. Viana;S. Jacquart
中科院分区：
文献类型：
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作者：
A. Lecointre;A. Bessière;A. Bos;P. Dorenbos;B. Viana;S. Jacquart
通过热激发光研究了 Ln = Nd、Er、Ho、Dy 共掺杂 (Ce3+,Ln3+) 和 (Pr3+,Ln3+) 的磷酸钇。与Ce3+类似，Pr3+被发现能够在高温下捕获空穴，同时作为辐射复合中心，而Ln3+共掺杂剂则起到电子陷阱的作用。所有研究的 Ln3+（Ln = Ce、Pr、Nd、Er、Ho、Dy）的捕获深度均遵循 Ln2+ 能级预测。因此，首次在 Ce3+ 和 Pr3+ 分别在 0.20−0.27 和 0.58 eV 处证实了低温电子俘获。 195 K 峰归因于 YPO4 中的自陷电荷，而 480 K 峰则与镨掺杂独特相关。选择Pr3+为发光中心，Nd3+/Er3+/Ho3+/Dy3+为共掺杂剂，设计了红色长余发光荧光粉。正如 Ho3+ 共掺杂模型所预测的那样，获得了最佳的持久发光，尽管它被证明源自热辅助去捕获...
Yttrium phosphates codoped (Ce3+,Ln3+) and (Pr3+,Ln3+) with Ln = Nd, Er, Ho, Dy were investigated by thermally stimulated luminescence. Similar to Ce3+, Pr3+ was found able to trap holes up to high temperatures while being the radiative recombination center, whereas the Ln3+ codopant played the role of the electron trap. Trapping depths for all studied Ln3+ (Ln = Ce, Pr, Nd, Er, Ho, Dy) were found to follow the Ln2+ energy levels prediction. Low-temperature electron trapping at Ce3+ and Pr3+ was, therefore, evidenced for the first time at 0.20−0.27 and 0.58 eV, respectively. The 195 K peak was attributed to self-trapped charges in YPO4, whereas the 480 K peak was uniquely associated with praseodymium doping. Pr3+ as the luminescent center and Nd3+/Er3+/Ho3+/Dy3+ as the codopant were selected to design a red persistent luminescence phosphor. The best persistent luminescence was obtained as predicted by the model for Ho3+ codoping, though it was shown to originate from both thermally assisted detrapping fro...