Abstract In this work, we report a new optical properties and modification methods for the rare-earth (RE) ion doped upconversion (UC) materials. Here, The Yb3+- Eu3+ co-doped BiOCl layered micrometer crystals were synthesized via the traditional solid state reaction. The experiment results show that due to efficient photocarrier space separation role of IEF, a band-to-band multiphoton excitation process of Yb3+ ions and the subsequent photopolarization role have been triggered inside BiOCl crystals via a commercial 980 nm laser. Then, it combines the photopolarization electric field (PPF) of the laser beam to generate a multiplexed tunable photopolarization on the Eu3+ ions. Consequently, the uponverting Stark splitting and emission intensity ratio of electrical dipole transitions (EDTs) of Eu3+ ions could be tailored simultaneously, either by pumping power or Yb3+ ion doping level, but showing an opposite trend. This research provides new insights into the interaction between the light and materials as well as the UC tailored method of lanthanide ions, which may inspire the design of opto-electric multifunctional devices.

中文翻译：

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内电场下Yb3+离子的980 nm激发多光子光载流子分离过程及其对Eu3+离子的上转换修饰

摘要 在这项工作中，我们报告了稀土 (RE) 离子掺杂上转换 (UC) 材料的新光学性质和改性方法。在这里，Yb3+-Eu3+ 共掺杂BiOCl 层状微米晶体是通过传统的固态反应合成的。实验结果表明，由于IEF的有效光载流子空间分离作用，通过商用980 nm激光在BiOCl晶体内部触发了Yb3+离子的带间多光子激发过程和随后的光极化作用。然后，它结合激光束的光极化电场 (PPF)，在 Eu3+ 离子上产生多路可调的光极化。因此，可以同时调整 Eu3+ 离子的电偶极跃迁 (EDT) 的反转斯塔克分裂和发射强度比，无论是通过泵浦功率还是 Yb3+ 离子掺杂水平，但呈现出相反的趋势。该研究为光与材料之间的相互作用以及镧系离子的UC定制方法提供了新的见解，可能会启发光电多功能器件的设计。