Up-Conversion Luminescence Behavior of Er-Doped Oxides

Up-conversion (UC) phosphor gains extensive attention due to its wide applications for industrial uses. Most of the UC materials are realized by doping rare earth elements such as Er 3+ and Yb 3+ in the wide band gap hosts of nitrides, oxides and fluorides. Among them, various types of efficient UC phosphors were developed using oxide hosts, e.g., Er doped CaZrO 3 [1] and CaWO 4 [2]. Although the mechanism of the UC luminescence has not yet been fully understood, many researchers devoted into fabrication of efficient and long lifetime UC phosphors by changing the doped rare-earth and/or host materials. We have recently reported that the addition of alkaline metals during the fabrication by solid state reaction method can enhance UC luminescence intensity of Er-doped CaMoO 4 [3]. It was also found that co-dopings of rare-earth ions in Er-doped oxides can change luminescence wavelength [4]. In the present study, we will demonstrate the up-conversion behavior of Er-doped oxides focusing on the co-doping and additional substitution effect. [1] V. Singh et al., J. Appl. Phys. 112 , 063105 (2012). [2] J.H. Chun et al., J. Alloys Comp. 522 , 30-34 (2012). [3] T. Koikawa and T. Yamamoto, Opt. Mater., in press [4] Y. Shimazaki et al., 7th ICOM, 2025, Becici, Montenegro