Ln(HCOO)3 (Ln = Y, Gd, Ce, and La) With Triangular Configuration Exhibits Excellent UV Nonlinear Optical Performance

IF 13 2区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY Small Pub Date : 2025-02-07 DOI:10.1002/smll.202412404

Xue Bai, Xin Wen, Chensheng Lin, Yuchen Yan, Xuemei Shi, Xue Cao, Jindong Chen, Guangsai Yang, Zhanggui Hu, Jiyang Wang, Ning Ye, Guang Peng

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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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来源期刊

Small 工程技术-材料科学：综合

CiteScore

17.70

自引率

3.80%

发文量

1830

审稿时长

2.1 months

期刊介绍： Small serves as an exceptional platform for both experimental and theoretical studies in fundamental and applied interdisciplinary research at the nano- and microscale. The journal offers a compelling mix of peer-reviewed Research Articles, Reviews, Perspectives, and Comments. With a remarkable 2022 Journal Impact Factor of 13.3 (Journal Citation Reports from Clarivate Analytics, 2023), Small remains among the top multidisciplinary journals, covering a wide range of topics at the interface of materials science, chemistry, physics, engineering, medicine, and biology. Small's readership includes biochemists, biologists, biomedical scientists, chemists, engineers, information technologists, materials scientists, physicists, and theoreticians alike.