Li2Y4–xEux（MoO4）7荧光粉的制备及发光性能

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4h。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。     

基于精益管理思想的电力企业安全文化建设初探

从安全文化建设对电力企业的重要性、必要性的介绍入手,分析了电力企业安全文化建设的现状,针对现有的问题,提出精益管理的思想可以为安全文化建设带来新的机遇、思路,并初步探讨了基于精益管理思想的电力企业安全文化建设的原则和途径。     

Synthesis and luminescence characteristics of Li2Y4-xEux（WO4）7-y（MoO4）y red-emitting phosphor for white LED

Li2Y4-xEux（WO4）7-y（MoO4）y red-emitting phosphors were synthesized by solid state reaction and characterized by powder X-ray diffraction （XRD） and photoluminescence （PL） spectrum. The excitation spectra showed that the phosphors could be efficiently excited by near-UV light of 395 nm. When the relative molar ratio of Mo/W was 7：0, and the optimum doped concentration of Eu3＋was 2.8 mol, the phosphor showed strong red emission lines at 615 nm corresponding to the forced electric dipole 5D0→7F2 transition of Eu3＋. Compared with Na2Y2Eu2（MoO4）7 and K2Y2Eu2（MoO4）7, the fluorescence intensity of Li2Y1.2Eu2.8（MoO4）7 phosphor was the strongest. The CIE chromaticity coordinates of Li2Y1.2Eu2.8（MoO4）7 phosphor was calculated to be （0.66, 0.34）.