Spectroscopic properties of Dy3+-doped Sr3Y(BO3)3 crystal

Abstract

A 2.02 at.% Dy3+-doped Sr3Y(BO3)3 crystal was successfully grown by the Czochralski method. Polarized spectroscopic properties of the crystal were investigated at room temperature. The absorption spectra were analyzed based on Judd-Ofelt theory. Then the spontaneous transition probabilities, branching ratios, and radiative lifetime related to the 4F9/2 multiplet of Dy3+ were obtained. The peak emission cross-sections corresponding to the 4F9/2 → 6H13/2 transition are 0.10 × 10−20 and 0.12 × 10−20 cm2 for σ and π polarizations, respectively, and at 576 nm for both polarizations. The fluorescence lifetime and quantum efficiency were estimated to be 0.82 ms and 57%, respectively. The analysis on the fluorescence decay curve of the 4F9/2 multiplet indicated that the cross relaxation induced by the electric dipole-dipole interaction plays an important role in the depopulation of the 4F9/2 multiplet. The results show that the Dy3+:Sr3Y(BO3)3 crystal may be a promising candidate for solid state yellow laser pumped by a blue laser diode around 454 nm.