Abstract: A series of novel Sr_7-xSb₂O₁₂∶xDy³⁺(x=0~0.35) (mole percentage) phosphors were obtained by high temperature solid-state reaction. Its phase structure, luminescence properties, thermal stability and fluorescent decay lifetime were investigated. The characteristic emissions centered at 482 nm and 576 nm of Sr_7-xSb₂O₁₂∶xDy³⁺ were observed under the excitation light of 350 nm. When x=0.056, the Dy³⁺ concentration quench, and the Sr_6.944Sb₂O₁₂∶0.056Dy³⁺CIE chromaticity coordinates are (0.340 8, 0.349 3). The quenching mechanism is attributed to the dipole-dipole interaction between Dy³⁺. When x=0.14, the phosphors can emit white light with color coordinates (0.310 9, 0.314 0). In addition, the luminescence intensity of Sr_7-xSb₂O₁₂∶xDy³⁺ at 453 K is about 83.3% of that at room temperature, showing good thermal stability. The above research results suggest that the Sr_7-xSb₂O₁₂∶xDy³⁺ phosphor is expected to be used in UV-excited white light emitting diode.

Key words: Dy³⁺ doping, Sr₇Sb₂O₁₂, high temperature solid-state method, phosphor, photoluminescence, luminescence property, fluorescence lifetime, thermal stability