A UV non-hydrogen pure selenite nonlinear optical material for achieving balanced properties through framework-optimized structural transformation

Peng-Fei Li; Chun-Li Hu; Jiang-Gao Mao; Fang Kong

doi:10.1039/d3mh01790g

A UV non-hydrogen pure selenite nonlinear optical material for achieving balanced properties through framework-optimized structural transformation

Mater Horiz. 2024 Apr 2;11(7):1704-1709. doi: 10.1039/d3mh01790g.

Authors

Peng-Fei Li^{1

2}, Chun-Li Hu¹, Jiang-Gao Mao^{1

2}, Fang Kong^{1

2}

Affiliations

¹ State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, P. R. China. kongfang@fjirsm.ac.cn.
² University of Chinese Academy of Sciences, Beijing 100049, P. R. China.

PMID: 38270562
DOI: 10.1039/d3mh01790g

Abstract

For non-centrosymmetric (NCS) oxides intended for ultraviolet (UV) nonlinear optical (NLO) applications, achieving a wide band gap, large second harmonic generation (SHG) intensity, and sufficient birefringence to satisfy phase matching is a significant challenge due to their inherent incompatibility. To address this issue, this study proposes a strategy called framework-optimized structural transformation. Building upon centrosymmetric (CS) NaGa(SeO₃)₂ as a foundation, an original UV selenite NLO material, NaLu(SeO₃)₂, was successfully synthesized. The derived NaLu(SeO₃)₂ exhibits a balanced comprehensive performance, including a band gap (5.3 eV), an SHG response (2.7 × KDP), a UV cut-off edge (210 nm), a laser-induced damage threshold (LIDT) (151.69 MW cm^-2), birefringence (Cal: 0.138@546 nm, Exp: 0.153@546 nm), thermal stability (∼575 °C) and environmental stability. Notably, its SHG effect, band gap, LIDT, and birefringence are all the largest among UV non-hydrogen pure selenite materials. Such progress can be attributed to the successful arrangement of the SeO₃ groups by optimizing the cations on the framework of the parent compound.