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Updated: May 29, 2025

Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals
Published on: April 14, 2020
Ln(HCOO)3 (Ln = Y, Gd, Ce, and La) With Triangular Configuration Exhibits Excellent UV Nonlinear Optical Performance
Xue Bai1, Xin Wen1,2, Chensheng Lin3
1Tianjin Key Laboratory of Functional Crystal Materials, Institute of Functional Crystal, Tianjin University of Technology, Tianjin, 300384, China.
Abstract:
Identifying an ideal structure is essential for developing outstanding nonlinear optical (NLO) crystals, which typically involve the selection of microscopic functional building blocks (FBUs) and constructing excellent crystal structures. This often presents significant challenges. Herein, the long-neglected π-conjugated [HCOO]- is selected as the UV NLO-active FBU, and a series of isomorphic anhydrous rare earth formates, Ln(HCOO)3 (Ln = Y, Gd, Ce, and La) with the space group R3m, are synthesized and characterized. This crystal series exhibits a desired delicate balance between strong second-harmonic generation (SHG) effects (2.41-3.89 × KH2PO4), large band gaps (4.20-5.45 eV), and suitable birefringence (0.064-0.081@1064 nm). Besides, such a unique structure exhibits a significant structure-property correlation, revealing that the ionic radius of Ln3+ is inversely related to the SHG effect, and a smaller ionic radius corresponds to stronger SHG effects.
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