Preparation of Red-Emitting Phosphor [ ${\hbox{K}}_{0.8}{\hbox{Y}}_{0.65}{\hbox{Eu}}^{3+}_{0.08}$ ][${\hbox{Mo}}_{0.2}{\hbox{W}}_{0.8}{\hbox{O}}_{4}$ ] and Calculation of ${\hbox{Eu}}^{3+}\ ^{5}{\hbox{D}}_{0}$ Quantum Efficiency

The red-emitting phosphor [K<sub>0.8</sub>Y<sub>0.65</sub>Eu<sup>3+</sup><sub>0.08</sub> ][Mo<sub>0.2</sub>W<sub>0.8</sub>O<sub>4</sub>] was produced by a solid-state method. Through XRD spectra, DTA-TG and photo-luminescent analysis, the possible reaction path and the emission mechanism of the phosphor were mentioned, and the partial Judd-Ofelt parameters and quantum efficiency of Eu<sup>3+ 5</sup>D<sub>0</sub> energy level were calculated under 395 nm excitation. The results indicate that the red-emitting phosphor, of which the quantum efficiency is 13.43%, can become the potential applications for white light-emitting diode in the future.

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