Host-sensitized phosphorescence of Mn4+, Eu3+, and Yb3+ in MgAl2Si2O8

Abstract

Mn4+ doped and Eu3+, Yb3+ co-doped MgAl2\ud Si2O8-based phosphors were prepared by conventional\ud solid state reaction at 1,300 C. They were characterized\ud by thermogravimetry, differential thermal analysis, X-ray\ud powder diffraction, photoluminescence, and scanning\ud electron microscopy. The luminescence mechanism of the\ud phosphors, which showed broad red emission bands in the\ud range of 600–715 nm and had a different maximum\ud intensity when activated by UV illumination, was discussed.\ud Such a red emission can be attributed to the\ud intrinsic 2E + 4A2 transitions of Mn4+

Enhancement of Curie temperature and photoluminescent properties of Nd2Mo2O7, Ho2Mo2O7, and Gd2Mo2O7

“…It is clear that, Er 3+ ion improves the Curie temperature when doped in the Nd 2 Mo 2 O 7 host crystal. In Gd 2 Mo 2 O 7 , the Mo ion spins order ferromagnetically near T c = 60 K, when Eu 3+ ion was doped into Gd 2 Mo 2 O 7 host crystal, the Curie temperature increases . Also, when Er 3+ ion was doped into Ho 2 Mo 2 O 7 host crystal, higher dielectric constant (7.89), higher piezoelectric charge constant (0.77), and higher Curie temperature (1537°C) were obtained in this study.…”

“…Polycrystalline Nd 1.90 Er 0.10 Mo 2 O 7 , Ho 1.90 Er 0.10 Mo 2 O 7 , and Gd 1.98 Eu 0.02 Mo 2 O 7 were prepared by solid‐state reaction of stoichiometric ratios of Nd 2 O 3 (99.9%), Er 2 O 3 (99.9%), Ho 2 O 3 (99.9%), Gd 2 O 3 (99.99%), Eu 2 O 3 (99.9%), and MoO 2 (99.98%). A small amount of Er 3+ and Eu 3+ ions was doped by evaluating our previous photoluminescence studies and literature . The powder mixtures were analyzed by the simultaneous differential thermal analysis (DTA) and the thermogravimetric (TG) analysis (Seiko Instruments Inc/Exstar TG/DTA 630) at a heating rate of 10°C/minute from room temperature to 1300°C to to determine reaction optimum.…”

Investigation of the effect of ytterbium doping on photoluminescence and photocatalytic activity of Li4Ti5O12

“…Photoluminescent materials are kinds of energy storage materials that can absorb both ultraviolet (UV) and visible light and gradually release this energy in the dark at a certain wavelength. These kinds of phosphors have been widely studied by many researchers 1–6 . Rare earth plays a very important role in the development of lighting devices due to its abundant emission colors based on 4f‐4f or 5d‐4f transitions 7 .…”

“…These kinds of phosphors have been widely studied by many researchers. [1][2][3][4][5][6] Rare earth plays a very important role in the development of lighting devices due to its abundant emission colors based on 4f-4f or 5d-4f transitions. 7 Therefore, it is important to search and select the appropriate host material to improve the luminescence derived from these elements.…”