LUMINESCENCE OF Ce~(3 ) IN STRONTIUM HALOPHOSPHATES

Fluorescence spectroscopic study unraveled that there exist two types of luminescent center incerium(3 )activated Sr_5(PO_4)_3Cl crystals.Luminescence properties of Ce~(3 ) in Sr_5(PO_4)_3X(X=F,Cl,Br)have been studied.Meanwhile crystalline Sr_5(PO_4)_3Br and the subsolidus phase relationship of binarystrontium halophosphate systems have been determined.     

荧光纯碳酸铵的研制

本文采用络合吸附色层法从碳酸铵中除去铁、铜、钴、镍和铅等重金属杂质。通过研究各种络合剂的提纯效果和色层柱的最佳工作条件表明:采用络合吸附色层法能从碳酸铵中除去上述杂质,可到ppm数量级:Fe<0.58,Cu<0.2,Co<0.22,Ni<0.72,Pb<0.2。从而提供了一种产品质量好,设备简单和生产效率较高的制备荧光纯碳酸铵的方法。     

络合吸附色层法纯制碱金属化合物的研究

制备高质量的荧光粉,首先要制得高纯度的原材料。制备高纯原材料,不仅要提纯基质材料,也要纯制助熔剂。碱金属化合物可用作发光材料的基质,也可用作助熔剂。因此有必要研究碱金属化合物的提纯,以除去其中对发光有害的杂质。使用络合吸附色层法来提纯发光材料是一种简单易行、生产效率较高的方法。     

Thermal Shift of Energy Levels in the Eu~(2+)-Doped Strontium Chlorophosphate

The thermal shift of 5d energy level of Eu~(2+) doped in Sr_5(PO_4)_3Cl have been measured in 10～700 K.A simulation calculation was worked out with a modified theoretical equation.     

Photostimulated Luminescence and F-centers of Sr_3Ca_2(PO_4)_3X:Eu~(2+)(X=F,Cl,Br)

This paper reports the F-centers and photostimulated luminescence of Eu~(2+)-activated Sr_3Ca_2(PO_4)_3Xcrystals.The influence of various halide ions on the F-centers and their energy level is discussed.The mechanismfor the photostimulated luminescence and valence change of Eu ion in that process have been investigated.     

Photoluminescence of Cerium(Ⅲ)in Lanthanum Strontium Halophosphates

La_(1.5)Sr_(7.0)Na_(1.5)(PO_4)_6X′X″(X′and X″stand for two identical or different halide ions F~-,Cl~-,and Br~-)is anew kind matrix of phosphors.X-ray analysis shows that these crystals belong to the apatite structure ofhexagonal system with a space group of p6_(3/m).Their lattice parameters have been obtained.Subsolidus phaserelationship in the double halophosphate systems were determined by lattice parameter method.It has beenproved that in the Br-Cl and F-Cl systems there exist complete and continuous solid solutions.In the F-Br sys-tem there appears a two phase region with the bromide composition 0.75