Nd-doped gadolinium aluminium tetraborate, Nd_xGd_1-xAl₃(BO₃)₄ (NGAB), crystallizes with x = 0.1 in the trigonal system with point group 32, conforming space group R32. They were grown using flux method, of large sizes and good optical quality. The unit cell constants were a = 0.93057 (6) and c = 0.72481 (3) nm, and z = 1. The measured absorption of the NGAB is compared to Judd-Ofelt (JO) theory. When applied, the JO theory of parity-forbidden electric-dipole transitions of rare earth ions on noncentrosymmetric sites demonstrates good agreement. A measured band gap of the eigentransition was about 4.00 eV. The fitted intensity parameters Ot (t = 2, 4, and 6) were 2.446 x 10^-20, 2.266 x 10^-20 and 2.598 x 10^-20 cm². Both the emission properties of the sub-stable 4F3/2 state with the level lifetime of 506.20 µs and a fluorescence spectrum corresponding to the transition 4F3/2 -> 4I11/2 were studied. The results indicate the pass band of laser for potential applications in practice.

Keywords: absorbance spectrum, luminescence parameter, activated ion, sub-stable state

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