Crystal structure and optical characteristics of K${}_2$Nd${}_2$O(BO${}_3$)${}_2$

A rare earth oxyborate crystal K${}_2$Nd${}_2$O(BO${}_3$)${}_2$ has been grown by means of high temperature solution method for the first time. It crystallizes in monoclinic P2${}_1$/c (No. 14) space group, and the lattice parameters are a=11.318(6) Å, b=6.575(4) Å, c=10.689(6) Å, β=117.062(12)°, and Z=4. The absorption spectrum, emission spectrum, and fluorescence lifetime of K${}_2$Nd${}_2$O(BO${}_3$)${}_2$ have been evaluated, and the foundational spectral parameters have been analysed according to the Judd-Ofelt theory. The high concentration of activated ions (1.13×10${}^{22}$ ions/cm${}^3$), large absorption coefficient (87.63 cm${}^{-1}$), long fluorescence lifetime (91.2 µs), and large emission cross section (2.03×10${}^{-20}$ cm${}^2$) of K${}_2$Nd${}_2$O(BO${}_3$)${}_2$ suggest its potential applications of microchip lasers. (© 2024 Wiley‐VCH GmbH)