Tunable Light Polarization Information from Single Upconverting Fluoride Microcrystal
Tunable Light Polarization Information from Single Upconverting Fluoride Microcrystal
复制标题
DOI：
10.1002/adom.202100044
复制
发表时间：
2021-04
影响因子：
9
通讯作者：
Dandan Yang;Zixing Peng;Xin Guo;Shuqian Qiao;Pu Zhao;Qiuqiang Zhan;Jianrong Qiu;Zhongmin Yang;G. Dong
中科院分区：
文献类型：
--
作者：
Dandan Yang;Zixing Peng;Xin Guo;Shuqian Qiao;Pu Zhao;Qiuqiang Zhan;Jianrong Qiu;Zhongmin Yang;G. Dong
显示、成像、数据通信和光电检测等领域的关键部件是具有高度各向异性光电特性的低维微纳材料，表现为偏振光。然而，对于各向异性上转换(UC)材料，获得可调偏振特性仍然是一个巨大的挑战。本文在详细研究了稀土离子(RE3+)的晶体结构、局域对称性和性质的基础上，利用一系列RE3+单掺或共掺的β-NaYF4微棒，成功地实现了可调的UC光偏振特性。通过密度泛函理论计算模拟了激活剂的电子云分布和成键结构，结果表明：1)具有独特电子云分布的Yb3+通过能量转移过程调节了激活剂的UCLPC；ii)与偶极极化率较大的RE3+共掺杂使激活剂的UCLPC向各向异性分布，从而改善了激活剂的UCLPC；通过利用来自不同掺杂组合的独特的UCLPC，说明了其在光存储、加密和防伪方面的应用。同时，这项工作的发现将为理解各向异性结构中RE3+的偏振性质提供新的和令人兴奋的基本见解。
The key components in display, imaging, data communication, and photoelectric detection fields are low‐dimensional micro‐/nanomaterials with highly anisotropic optoelectronic properties manifesting polarized light. However, for anisotropic upconversion (UC) materials, obtaining tunable polarization characteristics remains a significant challenge. Herein, based on a detailed investigation of the crystal structure, local symmetry, and properties of rare‐earth ions (RE3+), the authors successfully realized a tunable UC light polarization characteristic (UCLPC) with dependence on excitation polarization using a series of RE3+ single‐ or co‐doped β‐NaYF4 microrods. By simulating the electron cloud distribution and bonding structure based on density functional theory calculations, it is shown that: i) Yb3+ with a unique electron cloud distribution adjusts the UCLPC of the activator via energy transfer processes; ii) co‐doping with RE3+ having a larger dipole polarizability improves the UCLPC of the activator by performing its electric field distribution toward anisotropy; and iii) increasing the activator concentration strengthens the UCLPC. By exploiting the unique UCLPC from different doping combinations, applications in optical storage, encryption, and anti‐counterfeiting are illustrated. Simultaneously, the findings obtained in this work will provide new and exciting fundamental insights into understanding the polarization properties of RE3+ in an anisotropic structure.