期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 61, 期 10, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202115669
关键词
chromatic dispersion; fluorooxoborates; fourth harmonic generation; functionalized chromophore; nonlinear optical materials
资金
- Key Research Program of Frontier Sciences, CAS [ZDBS-LY-SLH035]
- National Natural Science Foundation of China [51922014, 51972336, 22193044]
- West Light Foundation of CAS [2019-YDYLTD-002]
- International Partnership Program of CAS [1A1365KYSB20200008]
- Instrument Developing Project of CAS [GJJSTD20200007]
- Natural Science Foundation of Xinjiang [2021D01E05]
This paper proposes a strategy of introducing fluorinated tetrahedral boron-centred chromophores to optimize chromatic dispersion. By introducing the [BF4](-) unit with a large HOMO-LUMO band gap, Na4B8O9F10 has been successfully designed and synthesized. It has optimized chromatic dispersion and can achieve a short second harmonic generation phase-matching wavelength.
Exploring significant ultraviolet/deep-ultraviolet nonlinear optical (NLO) materials is hindered by rigorous and contradictory requirements, especially, possessing a moderate optical birefringence to meet phase-matching (PM). Except for suitable birefringence, small chromatic dispersion is also crucial to blue-shift the PM wavelength. Here, the introduction of a fluorinated tetrahedral boron-centred chromophore strategy was proposed to optimize the chromatic dispersion. Herein, the [BF4](-) unit with a large HOMO-LUMO band gap was introduced to the Na-B-O-F system and Na4B8O9F10 was designed and synthesized successfully for the first time. Na4B8O9F10 with an optimized chromatic dispersion can achieve a short second harmonic generation PM wavelength of 240 nm with a relatively small birefringence (0.036@1064 nm). Notably, Na4B8O9F10 is the first acentric crystal with [BF4](-) units among the reported metal-fluorooxoborate systems, involving isolated [BF4](-) and novel [B7O10F6](5-) fundamental building blocks.
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