2026-01-21 中国科学院（CAS）
Fig. (a) Representative structures of the synergistic combination of fluorinated polyhedra and π-conjugated B–O groups; (b) DUV NLO crystals designed and synthesized in this work. (Image by XTIPC)
＜関連情報＞
- https://english.cas.cn/newsroom/research_news/chem/202601/t20260122_1146334.shtml
- https://advanced.onlinelibrary.wiley.com/doi/10.1002/adfm.202531049
フッ素化多面体と重合BO3ユニットの相乗的組み合わせによる深紫外非線形光学結晶の構築 Constructing Deep-Ultraviolet Nonlinear Optical Crystals via Synergistic Combination of Fluorinated Polyhedra and Polymerized BO3 Units
Hongkang Su, Chenxu Li, Jiahao Jiao, Zhihua Yang, Shilie Pan
Advances Functional Materials Published: 10 January 2026
DOI:https://doi.org/10.1002/adfm.202531049
ABSTRACT
The development of modern science urgently needs the vital tool of deep-ultraviolet (DUV, λ < 200nm) all-solid-state lasers, while the exploration of DUV nonlinear optical (NLO) crystals is limited by their strict application conditions. Herein, we propose a structural design strategy for developing novel DUV NLO optical crystals through synergistic assembly of fluorinated polyhedral and planar B─O groups with balanced optical properties, namely, large second-harmonic generation (SHG) response, appropriate birefringence, and wide band gap. The key to achieve consistent alignment of π-conjugated functional groups lies in leveraging the “shearing” effect and directional polymerization capability of fluorinated polyhedra. Furthermore, based on this strategy, a series of alkali-metal fluorooxoborates Mx(NH4)2-xB8O12F2 (M = K, Rb; 0 < x < 2; KABF, RABF) and CsNH4B8O12F2 (CABF) were successfully designed and synthesized. Driven by uniformly arranged [BO3F]4− and chain-like aggregated [BO3]3− functional groups, these compounds achieve a well-balanced optimization of strong SHG response (1.6–1.7 × KDP, 1064–532 nm; 0.4–0.5 × BBO, 532–266 nm, respectively) and the shortest type-I phase-matching wavelength (161.5–168.6 nm). The inspiring results highlight their potential as candidates for DUV NLO crystals and provide support for the structure construction strategy using a synergistic combination of fluorinated polyhedra and polymerized BO3 units.
