Shi Xinyue, Liu Xueqing, Nie Chunxiao, Zhang Yangkai, Zhong Degao, Teng Bing, Lin Zhoubin, Huang Yisheng, Sun Shijia
College of Physics, Qingdao University, National Demonstration Center for Experiment Applied Physics Education (Qingdao University), Qingdao Broadband Terahertz Spectroscopy Technology Engineering Research Center (Qingdao University), Qingdao 266071, China.
Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China.
Inorg Chem. 2025 Feb 3;64(4):2127-2132. doi: 10.1021/acs.inorgchem.4c05197. Epub 2025 Jan 23.
As promising optoelectronic functional materials in the short-wavelength spectral region, such as ultraviolet (UV) and deep UV, phosphates have recently received increased attention. However, phosphate materials commonly suffer from limited birefringence owing to the highly symmetrical PO tetrahedra. We herein report a layered tin(II) phosphate with improved birefringence. By employing a polarizing microscope, the measured refractive index difference determined on a (010) wafer is 0.042@550 nm, which is very close to the calculated refractive index difference of 0.039@550 nm between and through the density functional theory (DFT) method. The largest birefringence appears on the (100) plane, which is theoretically determined to be 0.078@550 nm. Single crystals of SnHPO measuring 20 × 4 × 3 mm can be easily grown by a hydrothermal method. In addition, SnHPO is UV transparent with a short UV absorption cutoff edge of 242 nm and an optical band gap of 4.50 eV, implying that it could be a potential UV birefringent material.
作为短波长光谱区域（如紫外（UV）和深紫外）中有前景的光电功能材料，磷酸盐最近受到了越来越多的关注。然而，由于高度对称的PO四面体，磷酸盐材料通常具有有限的双折射。我们在此报告一种具有改善双折射的层状磷酸锡（II）。通过使用偏光显微镜，在（010）晶片上测得的折射率差在550 nm处为0.042，这与通过密度泛函理论（DFT）方法计算得到的 和 之间在550 nm处的折射率差0.039非常接近。最大双折射出现在（100）平面上，理论上确定为550 nm处0.078。尺寸为20×4×3 mm的SnHPO单晶可以通过水热法轻松生长。此外，SnHPO是紫外透明的，具有242 nm的短紫外吸收截止边缘和4.50 eV的光学带隙，这意味着它可能是一种潜在的紫外双折射材料。
