Photoluminescence Properties of Novel Host‐Sensitized Y 6 WO 12 : Dy 3+ Phosphors

Novel host‐sensitized Y 6 WO 12 : x Dy 3+ (0.01 ≤ x ≤ 0.20) phosphors were synthesized via solid‐state reaction process. X‐ray diffraction analysis confirmed the phase formation of Y 6 WO 12 : Dy 3+ materials. The photoluminescence excitation and emission spectra, concentration effect, thermal‐quenching, and decay properties were investigated. The phosphor could be excited by the UV light region from 300 to 400 nm, and it exhibited blue (478 nm) and yellow (568 nm) emission corresponding to 4 F 9/2 – 6 H 15/2 transitions and 4 F 9/2 – 6 H 13/2 transitions, respectively. The WO 6 groups in the host lattices can absorb UV light efficiently, and then transferred the energy to the activator Dy 3+ ions, resulting in near white light emission. The optimum dopant concentration of Dy 3+ ions in Y 6 WO 12 : x Dy 3+ was around 5 mol% and the critical transfer distance of Dy 3+ was calculated as 12 Å. The fluorescence lifetime was also determined in Y 6 WO 12 :0.05 Dy 3+ . The temperature dependence of photoluminescence properties was investigated from 300 to 480 K and the prepared Y 6 WO 12 : Dy 3+ phosphors showed poor thermal‐quenching properties.