Volume 21, Issue 24 2504184
Research Article

Improving the Performance of Birefringent Crystals by Molecular Assembly Strategy in the Solar-Blind UV Region

Guangsheng Xu

Guangsheng Xu

Research Center for Crystal Materials, CAS Key Laboratory of Functional Materials and Devices for Special Environmental Conditions, Xinjiang Key Laboratory of Functional Crystal Materials, Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, 40–1 South Beijing Road, Urumqi, 830011 China

Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049 China

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Chenhui Hu

Chenhui Hu

Research Center for Crystal Materials, CAS Key Laboratory of Functional Materials and Devices for Special Environmental Conditions, Xinjiang Key Laboratory of Functional Crystal Materials, Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, 40–1 South Beijing Road, Urumqi, 830011 China

Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049 China

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Huimin Li

Huimin Li

Research Center for Crystal Materials, CAS Key Laboratory of Functional Materials and Devices for Special Environmental Conditions, Xinjiang Key Laboratory of Functional Crystal Materials, Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, 40–1 South Beijing Road, Urumqi, 830011 China

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Juanjuan Lu

Juanjuan Lu

Research Center for Crystal Materials, CAS Key Laboratory of Functional Materials and Devices for Special Environmental Conditions, Xinjiang Key Laboratory of Functional Crystal Materials, Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, 40–1 South Beijing Road, Urumqi, 830011 China

Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049 China

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Zhihua Yang

Zhihua Yang

Research Center for Crystal Materials, CAS Key Laboratory of Functional Materials and Devices for Special Environmental Conditions, Xinjiang Key Laboratory of Functional Crystal Materials, Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, 40–1 South Beijing Road, Urumqi, 830011 China

Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049 China

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Jian Han

Corresponding Author

Jian Han

Research Center for Crystal Materials, CAS Key Laboratory of Functional Materials and Devices for Special Environmental Conditions, Xinjiang Key Laboratory of Functional Crystal Materials, Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, 40–1 South Beijing Road, Urumqi, 830011 China

Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049 China

E-mail: [email protected]; [email protected]

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Shilie Pan

Corresponding Author

Shilie Pan

Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049 China

Research Center for Crystal Materials, CAS Key Laboratory of Functional Materials and Devices for Special Environmental Conditions, Xinjiang Key Laboratory of Functional Crystal Materials, Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, 40–1 South Beijing Road, Urumqi, 830011 China

E-mail: [email protected]; [email protected]

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First published: 05 May 2025
Citations: 1

Abstract

Birefringent crystals are of great significance as the key element in the modulation of optical polarization state. However, there exists a mutual constraint between UV transparency and large birefringence, necessitating compromises. Herein, the micro-units that are beneficial to birefringence are selected and the crystal synthesis process is regulated by three molecular assembly strategies. First, the traditional π-conjugated groups are modified by introducing protons. Second, the π-conjugated groups are recombined through structural design, and different units are rationally assembled and oriented according to the beneficial way of birefringence. Third, inspired by the fluorination strategy in borate crystals, fluorine is added which can modify the chemical and function. The synthesis of a series of nine birefringent crystals, some of which (Rb2HCO3F·B(OH)3, Rb2C2O4·B(OH)3, RbHC2O4) exhibit almost the best optical properties in respective compounds of similar structure, can be regarded as birefringent crystals of potential use, and validate the effectiveness of the strategies. To the knowledge, this is the first experimental study on how to modify and regulate the assembly and arrangement of molecules of the birefringent crystals in the solar-blind UV region (λ < 280 nm). This work provides a reference for accelerating the exploration of birefringent crystals.

Conflict of Interest

The authors declare no conflict of interest.

Data Availability Statement

Data will be made available on request. The supplemental crystallographic data for this paper have been deposited at the Cambridge Crystallographic Data Centre under deposition number CCDC: 2289346; 2294353; 2393715–2393716; 2393719; 2393721–2393722; 2393744, and 2393781. These data can be obtained free of charge via www.ccdc.cam.ac.uk/data_request/cif, or by emailing [email protected], or by contacting The Cambridge Crystallographic Data Centre, 12 Union Road, Cambridge CB2 1EZ, UK; fax: +44 1223 336 033.

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