Luminescence properties of ZrW2O8:Eu3+ nanophosphors for white light emitting diodes

• Eu3+ ions occupy C1 point group of the Zr4+ site in ZrW2O8 crystals.
• The optimum doping concentration of Eu3+ was determined for the red emission.
• ZrW2O8:Eu possess high quantum efficiency and suitable chromaticity coordinates.

ZrW2O8:Eu3+ nanophosphors (ca. 60 nm) with different Eu3+ doping concentrations were obtained using hydrothermal syntheses. X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), photoluminescence excitation and emission spectra as well as decay curve measurements were used for the characterization. Under 466 nm excitation, strong red emission at 616 nm corresponding to 5D0–7F2 transition of Eu3+ was observed for ZrW2O8:Eu3+ (9 mol%) phosphors. The values of intensity parameter Ω2 and Ω4 are 17.82 × 10−20 cm2 and 1.092 × 10−20 cm2, respectively. The high quantum efficiency of 83.5% of the ZrW2O8:Eu3+ (9 mol%) suggests this material could be promising red phosphor for generating white light in phosphor-converted white light-emitting diodes (LED).

Figure optionsDownload as PowerPoint slide