Volume 19, Issue 11 2500105
Research Article

Inch-sized K[NH2(CH2COO)2]: a High-Performance UV Nonlinear Optical Crystal Enabled by Novel Flexible π-Conjugated Building Units, [NH2(CH2COO)2]

Yujie Fan

Yujie Fan

State Key Laboratory of Functional Crystals and Devices, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002 China

Fujian College, University of Chinese Academy of Sciences, Fuzhou, Fujian, 350002 China

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Lingli Wu

Lingli Wu

State Key Laboratory of Functional Crystals and Devices, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002 China

Fujian College, University of Chinese Academy of Sciences, Fuzhou, Fujian, 350002 China

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Chensheng Lin

Chensheng Lin

State Key Laboratory of Functional Crystals and Devices, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002 China

Fujian College, University of Chinese Academy of Sciences, Fuzhou, Fujian, 350002 China

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Haotian Tian

Haotian Tian

State Key Laboratory of Functional Crystals and Devices, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002 China

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Chao Wang

Chao Wang

State Key Laboratory of Functional Crystals and Devices, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002 China

Fujian College, University of Chinese Academy of Sciences, Fuzhou, Fujian, 350002 China

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Tao Yan

Tao Yan

State Key Laboratory of Functional Crystals and Devices, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002 China

Fujian College, University of Chinese Academy of Sciences, Fuzhou, Fujian, 350002 China

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Min Luo

Corresponding Author

Min Luo

State Key Laboratory of Functional Crystals and Devices, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002 China

Fujian College, University of Chinese Academy of Sciences, Fuzhou, Fujian, 350002 China

E-mail: [email protected]

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First published: 05 March 2025
Citations: 2

Abstract

High-performance ultraviolet (UV) nonlinear optical (NLO) crystals must exhibit three critical properties: a large second-harmonic generation (SHG) response, adequate birefringence, and a short UV cutoff edge. However, these key characteristics are often interdependent and challenging to achieve simultaneously within a single crystal. In this study, a novel non-centrosymmetric compound, K[NH2(CH2COO)2] is introduced, synthesized from the innovative flexible π-conjugated group [NH2(CH2COO)2]. Benefiting from the excellent microscopic optical properties of the flexible π-conjugated [NH2(CH2COO)2] groups, despite the suboptimal arrangement of groups within the compound, K[NH2(CH2COO)2] still demonstrates a remarkable balance in its linear and nonlinear optical performance. This includes a strong SHG response of 3 times that of KDP, suitable birefringence of 0.088@1064 nm, and a short UV cutoff edge at 208 nm. Emphatically, high-quality, inch-sized single crystals (up to 60 × 46 × 30 mm3) are successfully grown using a water solution technique, paving the way for practical applications of this promising material.

Conflict of Interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available in the supplementary material of this article.

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