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 P 2 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.
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Feng et al. (2024) studied this question.
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