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A Polar Cerium Iodate Ce2(IO3)6(H2O) with a Strong Second-Harmonic Generation Response in Trivalent Ce-Based
Jiahang Liu1, Miao Zhang1,2, Shizheng Li1
1State Key Laboratory of Metastable Materials Science and Technology (MMST), Hebei Key Laboratory of Applied Chemistry, Yanshan University, Qinhuangdao 066004, China.
Abstract:
Ce-based polar materials are promising NLO candidates due to their unique electronic configuration of [Xe] 4f15d16s2 and diverse coordination modes. Ce4+ compounds are highly desired candidates for advanced nonlinear optical materials, yet the development of trivalent cerium-based NLO materials exhibiting a high second-harmonic-generation (SHG) response (above 3.0 × KDP) remains a great challenge. Herein, a new cerium iodate, Ce2(IO3)6(H2O), crystallized in the polar space group Pn (No. 7), was discovered by introducing rare-earth cations into iodates with a hydrothermal method, where corner-shared distorted [CeO9] polyhedra and [IO3]- groups alternately connect to assemble a three-dimensional (3D) framework. Optical studies showed that Ce2(IO3)6(H2O) exhibits strong SHG intensities (3 × KDP), a large band gap of 2.83 eV in the trivalent Ce-based NLO materials, indicating its potential application in frequency conversion. First-principles simulations of Ce2(IO3)6(H2O) were conducted to investigate the molecular structure and optical properties. First-principles calculations, informed by structural analysis, indicate that the two kinds of polarizable cerium-centered polyhedra ([Ce(1)O9] and [Ce(2)O8(H2O)]) constitute the primary contribution to the SHG coefficients.
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