Growth and Temperature-Dependent Spectral Properties of Yb3+, Tm3+ Co-Doped NaY(MoO4)2 Crystal

• Published in: Spectroscopy 2022-08, Vol.37 (8), p.16-24,82
• Main Authors: Wang, Xi, Chen, Zongyue, Zhang, Jianyu, Pan, Shangke, Pan, Jianguo
• Format: Magazinearticle
• Language: English
• Subjects: Annealing furnaces; Bridgman method; Coefficients; Crystal growth; Crystallization; Emission analysis; Emissions; Energy transfer; Fluorescence; Muffle furnaces; Scheelite; Segregation; Single crystals; Temperature; Temperature dependence; Thulium; X ray powder diffraction; X-ray diffraction
• ISSN: 0887-6703; 1939-1900
• DOI: 10.56530/spectroscopy.xq4572z5

The NaY(MoO4)2:Yb3+/Tm3+ single crystal was grown by the vertical Bridgman method using spontaneous crystallization. After annealing at 850 °C for 24 h in a muffle furnace under an air atmosphere, the obtained light black crystal became transparent and optically clear. Powder X-ray diffraction (PXRD) confirmed that the as-grown crystal had the structure of scheelite. The segregation coefficients of Tm3+ and Yb3+ were 0.589 and 0.588, respectively. Under 980 nm excitation, the temperature dependence of the emission intensity of the crystal in the temperature range of 298–473 K was measured. The results show that, because of the thermal quenching effect, the emission intensity decreases as the temperature rises. The possible energy transfer modes between Yb3+ and Tm3+ ions were analyzed. The emission cross section was calculated to be 1.97 × 10-20 cm2 by the Füchtabauer-Ladeburg formula, and the fluorescence lifetime was fitted to be 166.67 μs.