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In this work the authors report the study of energy transfer between Nd(3+) and Yb(3+) ions in disordered K5Bi1?x?yNdxYby(MoO4)4 crystals (x = 0.01, 0.05, 0.1, 0.15, 0.2 and y = 0.1) at room temperature by using steady-state and time-resolved laser spectroscopy. The spectroscopic properties of Nd(3+) and Yb(3+) ions in these crystals make them suitable for efficient energy transfer because of the energy gap between the (4)F)ind 3/2)(Nd(3+)) and (2)F5/2(Yb(3+)) levels which is around 300 cm?1. The transfer efficiency obtained from the lifetimes in the single doped and codoped samples reaches 77% for the highest Nd(3+) concentration. The donor decay curves obtained under pulsed excitation have been used to establish the multipolar nature of the Nd(3+) to Yb(3+) transfer process and the energy transfer microparameter. The nonradiative energy transfer is consistent with an electric dipole-dipole interaction mechanism assisted by energy migration among donors. Back transfer from Yb(3+) to Nd(3+) is not observed at the Yb(3+) concentration and temperature used in this work.