The absorption spectra and the luminescence decay curve of Er<sup>3+</sup>/Yb<sup>3+</sup>co-doped KY(WO<sup>4</sup>)<sup>2</sup>crystal was measured. The radiative transition rates were calculated by Judd-Ofelt theory. The Yb-to-Er energy-transfer rate and the cooperative upconversion coefficients were estimated by numerically solving the rate equations and fitting simulated curve to the measured data.

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