Crystal growth, electronic structure and luminescence properties of Nb/Yb co-doped RbTiOPO4 crystals
Crystal growth, electronic structure and luminescence properties of Nb/Yb co-doped RbTiOPO4 crystals
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Nb/Yb共掺杂RbTiOPO4晶体的晶体生长、电子结构和发光性能
DOI：
10.1016/j.optmat.2017.10.022
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发表时间：
2018-01-01
影响因子：
3.9
通讯作者：
Duan, Xiulan
中科院分区：
文献类型：
--
作者：
Liu, Jian;Li, Ziqing;Duan, Xiulan
通过顶部籽晶溶液生长法，在两种不同的助熔剂体系中成功生长出铌/镱共掺的磷酸氧钛铷（RTP）晶体。从含MoO₃的混合溶剂中获得了透明度更高的5%Nb/3%Yb:RTP晶体。利用电子探针微分析仪（EPMA）对化学成分进行了分析，结果表明，Nb和Yb共掺能显著提高RTP晶体中Yb的浓度。在自助熔剂体系中添加MoO₃可提高生长晶体的质量，但对Yb掺入晶体并无帮助。采用X射线光电子能谱（XPS）分析了Nb/Yb:RTP晶体的电子结构。结果表明，O 1s与P 2p能级之间的结合能差（ΔBE（O - P））随Yb含量的增加先增大，随后随Nb含量的增加而减小，这与晶体中O - P键的共价性变化有关。然而，掺杂对O - Ti的化学键性质影响较小。还对Nb/Yb:RbTiOPO₄晶体的荧光光谱进行了分析，观察到了Yb³⁺离子的五个特征发射峰。（C）2017爱思唯尔出版社。保留所有权利。
Nb/Yb co-doped RbTiOPO4 (RTP) crystals were successfully grown by a top-seeded solution growth method from two different kinds of flux systems. 5%Nb/3%Yb: RTP crystal with more transparency was obtained from the mixed solvent containing MoO3. The chemical composition was analyzed by Electron Probe Microanalyzer (EPMA), and the result indicated that co-doping of Nb and Yb into RTP can greatly increase the concentration of Yb in RTP crystal. The addition of MoO3 into self-flux system can improve the quality of as-grown crystals, but it is not helpful to introduce Yb into crystal. The electronic structures of Nb/Yb: RTP crystals were analyzed using X-ray photoelectron spectra (XPS). The results show that the binding energy difference between O 1s and P 2p levels (Delta BE (O-P)) increases firstly with the increase of Yb content, and then decreases with Nb content increasing, which is associated with the covalency change of O-P bonds in crystals. However, the doping has little influence on the chemical bond properties of O-Ti. The FL spectra of Nb/Yb: RbTiOPO4 crystals were also analyzed, and five emission peaks characteristic of Yb3+ ions were observed. (C) 2017 Elsevier B.V. All rights reserved.