Growth, thermal and spectral properties of Tm3+, Ho3+ co-doped NaGd(MoO4)2 Crystal
Published:
Recommended citation: C. Wang, H. Yin, A. Li, et al. "Growth, thermal and spectral properties of Tm3+, Ho3+ co-doped NaGd(MoO4)2 Crystal", Journal of Alloys and Compounds, 2014, 615, 482-487. https://doi.org/10.1016/j.jallcom.2014.06.084
A Tm3+/Ho3+:NaGd(MoO4)2 crystal was grown by the Czochralski method. The XRD results matched standard data from JCPDS file, which accorded with scheelite structure with an I41/a space group. Thermal properties of crystal were analyzed by using the TG–DSC curve. The melting point and specific heat are 1182 °C and 0.5 J/g K at 300 K, respectively. The Spectral properties of the Tm3+/Ho3+:NaGd(MoO4)2 crystal were investigated, including room temperature absorption spectrum and fluorescence spectrum. The absorption cross-section of Tm3+ at 796 nm is 4.33 × 10−20 cm2 with pertinent full widths at half maximum (FWHM) of 10 nm. The intensity parameters, spontaneous emission probability, fluorescence branching ratios and radiative lifetimes were calculated by Judd–Ofelt theory. The emission cross-sections are 1.47 × 10−20 cm2 and 1.36 × 10−20 cm2 for Tm3+ at 1850 nm and Ho3+ at 2000 nm respectively. The lifetime of 5I7 → 5I8 (Ho3+) was 4.263 ms.