关键词: 发光二极管, 荧光粉, 固相反应, 稀土, 能量传递

Abstract: Eu³⁺ and Bi³⁺-codoped MgNb₂O₆ red-emitting phosphor was prepared by solid-state reaction.The structure,morphology and photoluminescence properties of the phosphors were characterized by X-ray diffraction,scan electron microscopy and fluorescence spectrophotometer.The effect of the Bi³⁺ on the photoluminescence of the MgNb₂O₆:Eu³⁺ phosphor was also studied.X-ray diffraction results showed that the pure phase of MgNb₂O₆ could be available calcined at 1 200 °C.Mg_1-xNb₂O₆:Eu³⁺_x phosphors could be effectively excited by the 395 nm UV irridiation and emit red light at 615 nm due to the forced electric dipole ⁵D₀→⁷F₂ transitions of Eu³⁺,which indicated that Eu³⁺ occupied the non-inversion the symmetry sites in the MgNb₂O₆ host lattice.The addition of the Bi³⁺ increased the photoluminescence intensity of the excitation spectra at about 329 nm.Therefore,MgNb₂O₆:Eu³⁺,Bi³⁺ might find application to shortwave UV (200～350 nm) light emitting diodes.

Key words: light-emitting diode, phosphor, solid-state reaction, rare earths, energy transfer