卤磷酸钙荧光粉中CaSb2O6:Mn的光谱研究

CaSb2O6:Mn是卤磷酸钙荧光粉(以下简称卤粉)中的杂质相,它对卤粉的发光性能和老化性能都有不良影响,这方面的研究已有较多论述。有关CaSb2O6:Mn的光谱研究尚不多。1951年曾发现在卤粉中增加Sb量时出现绿色发光。1955年R.Bernara曾描述了在520nm具有辐射的CaSb2O6:Mn的发光性质。

SPECTRA OF CaSb2O6:Mn IN CALCIUMHALOPHOSPHATE PHOSPHORS

CaSb2O6:Mn is an impurity phase in calciumhalophosphate phosphors,which it can influence luminescent properties of phosphors and also shorten the lifetime of phosphors. So far there is only a few work on spectra of Ca-Sb2O6:Mn. In this paper emission spectra of CaSb2O6:Mn were measured and investigated in detail.Excitation spectra were measured from 240nm to 340nm. When samples were excited by different wavelengths of ultraviolet light (220,230,240,250,254,260,270,280,290,300,312.6,320),a series of emissiol.spectra were obtained.Preparation of CaSb2O6:Mn.1)CaSb2O3:Mn seperated from commercial calciumhalophosphate phosphors. Dissolve the commercial calciumhalophosphate phosphors by HC1 acid. The insoluble material is CaSb2O6:Mn which emits a green fluorescence under excitation of UV light.2)Synthesis of CaSb2O6:Mn.Synthesized CaSb2O6:Mn was prepared by solids state reaction:raw materials calciumcarbonate,antimony trioxide and manganese carbonate were mixed and then fired at 1100-1200℃ in air for one or two hours.The concentration of Mn is nominally about 1%.In the emission spectra of synthesized CaSb2O6:Mn or of that seperated from calciumhalophosphate phosphors,a broad emission band near 395nm is observed(Fig.1 and 2).It is found that the intensity of this broad band increases with the increasing of exciting wavelength when the latter is shorter than 254nm,but when the latter is longer than 254nm,the emission intensity decreases (Table 1 and 2).