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
_0.8
Y
_0.65
Eu
³⁺
_0.08
][Mo
_0.2
W
_0.8
O
₄
] 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
^{3+ 5}
D
₀
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.