Trivalent rare earth ions samarium and europium ions were doped into the prepared Gd 2 MgTiO 6 host crystal structure by high temperature solid phase method. XRD patterns show that the synthesized materials belong to the monoclinic structure with space group P 21 / n . Using UV-visible spectroscopy, the band gaps can be calculated to be 4.18, 4.15 and 3.84 eV for host, Sm 3+ and Eu 3+ -doped samples, respectively. For Sm-doped sample excited with 407 nm, the PL spectrum shows three prominent peaks at 565 nm, 603 nm and 649 nm, which are attributed to the transitions of 4 G → 5 / 2 6 H 5/2 , 4 G → 5 / 2 6 H 7/2 and 4 G → 5 / 2 6 H 9/2 , respectively. The 591 nm and 615 nm emissions of Eu 3+ doping correspond to the transitions from 5 D 0 to 7 F 1 and 7 F 2 , respectively. The optimal concentrations are 0.03 mol and 0.09 mol for Sm 3+ and Eu 3+ doping, respectively. The prepared samples can be used in the field of LEDs thanks to lower color temperature CCT=1700∼2200 K and higher color purity >97%.
Dy 3 + doped Gd 2 MgTiO 6 (GMT) phosphors were were fabricated using the high temperature solid state method in this study. Fluorescence, UV-visible spectrometer, X-ray photoelectron spectrometer, and Transient fluorescence spectrometer. The results show that the structures of the series of phosphors belong to the monoclinic crystal system, and Dy 3 + was successfully incorporated into the GMT host without affecting its structure. The samples emitted extremely strong blue and yellow light, which are the transitions derived from 4 H 9 / 2 to 6 H 15 / 2 (482 nm) and 6 H 13 / 2 (575 nm) levels, respectively. The sample shows obvious effects of concentration, GMT: 0.11Dy 3 + phosphor has the best photoluminescence (PL) intensity 7.148 × 10 5 , lifetime is 0.16 ms, and an internal quantum efficiency (IQE) is 2.1 % . The Dy 3 + doped sample has a larger energy band gap of 4.11 eV. The prepared samples exhibit color coordinates in proximity to that of standard white light, which indicates that the phosphor GMT: Dy 3 + can be applied to white light phosphors and light-emitting diode (LED) devices.
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