Li_2Y_(4–x)Eu_x(MoO_4)_7荧光粉的制备及发光性能

Preparation and Photoluminescence Property of Li_2Y_(4-x)Eu_x(MoO_4)_7 Phosphors

采用高温固相法合成了系列红色荧光粉Li2Y4–xEux(MoO4)7。合成样品的最佳烧结温度和时间分别为850℃和4 h。X射线衍射显示样品为纯相Li2Y4(MoO4)7四方晶系晶体结构。光致发光光谱表明,该样品能够被395nm的近紫外光和465nm的可见光有效激发,主发射峰位于615nm附近,对应于Eu3+的5D0→7F2跃迁,显色性能好,可作为白光发光二极管用红色荧光粉;且Eu3+的掺杂量x为2.8时,样品Li2Y1.2Eu2.8(MoO4)7的相对发光强度达到最大值。

A series of novel red light-emitting phosphors Li2Y4–xEux（MoO4）7 were synthesized by a solid-state reaction.The optimal synthesis of the phosphors via sintering occurred at 850 ℃ for 4 h.The result by X-ray diffraction indicates that the sample is a pure phase of Li2Y4（MoO4）7 crystal structure with the tetragonal crystal system.The photoluminescence spectra exhibit that the sample can be excited effectively by a near-ultraviolet light of 395 nm and a visible light of 465 nm.The main emission peaks located at 615 nm,corresponding to 5D0→7F2 transition of Eu3＋,and they could be used for a white light emitting diode（LED） with the color perform-ance.The relative intensity of the sample Li2Y1.2Eu2.8（MoO4）7 reached a maximum when the doped-Eu3＋ quantity x was 2.8.