| Research on yttrium oxysulfide phosphor doped with Eu3+ is to made to develop a new high-efficient, steady and red phosphor without radioactive substance. It includes that fluorescent properties of phosphor including structure, spectra property, chrome , long-persistent property and preparation technics.The influence of Y2O2S:Eu phosphors fluorescent spectra, chroma and luminescence intensity is systematically studied when different concentration of Europium is adulterated into different phosphors by means of XRD , Fluorescent Spectra Analysis ,Time-basing Spectra Analysis, Long-persistent Fluorescent Spectra Analysis and so on; The influence on Y2C>2S:Eu phosphors structure , luminescence intensity and long-persistent curve is investigated when different concentration of Mg24" > Ti4"1" is adulterated into different phosphors, finding the most suited concentration of Mg2"*\ Ti4"1"; Base on the suited concentration of Mg2+> Ti4+ , the influence rule on phosphors luminescence intensity and long-persistent curve with changing of Eu + concentration is also studies. At the same time, by using rare-earths metals adulteration and theory of chroma synthesis, the possibility of sensitized buildup of phosphors and the synthesis of different color long-persistent phosphors is also researched.The influence of Y2O2S:Eu phosphors fluorescent spectra, chroma and luminescing efficiency is studied with the changing of concentration of Eu34" ion, and the suited concentration of Eu3+ ion is acquired, all these provided support for the research on the YzC^S:Eu ,Mg,Ti long-persistent phosphors structure and luminescence performance. It is found that the exciting spectra is moving to long wave with the increasing of Eu concentration , emission intensity is rising, the properity of red homochromy is becoming better because of the different quench concentration of emission levels 5Do, 5Dj and 5D2- When the concentration of Eu is up to 1.2mol%, the emission levels 5Di and 5D2 is quenching.The influence rule of Y2C>2S:Eu ,Mg,Ti long-persistent phosphor fluorescent properity and luminesce intensity is studied with the changing of concentration of Mg, Ti. It is found that Y2C>2S:0.002Eu ,0.02Mg,0.01Ti phosphor is long-persistent ,but fluorescent intensity is low. When concentration of Mg2+ ion is provided 20mol%, the fluorescent intensity is rising with concentration augment of Ti4"1' ion, till to!0mol%, then decreasing, the same to the concentration augment of Mg2"1" when concentration of Ti4"1" ion is provided 10mol%. The suited concentration of Mg2+ is 20mol%, and the concentration of Ti takes more effect on the fluorescent intensity.Base on the suited adulteration concentration of Mg2+, Ti4*, the relationship between concentration of Eu3+ and phosphor luminesce properity and chroma is studied. It is found that with concentration of Eu3"1" increasing ,the fluorescent intensity is firstly rising then falling. A suited concentration of Eu3+ is found that the fluorescent intensity is highest but the chroma leans to orange.The influence of phosphor luminesce and fluorescent intensity is studied by adulterating different ions(Bi3\ Dy3*, Gd3\ La3\ Sm3+) into phosphor. Theadulteration of Dy3+N Gd3"1"^ La3+> Sm3"1" can inhance the luminesce efficiency, while Bi3+ decreases. The adulteration of Bi3\ Sm3+ can increase the fluorescent intensity, while Dy3+> Gd3\ La3+ reduce it ^specially Dy3"1".The influence of chroma is investigated on physical compound of long-persistent red phosphor and strontium aluminate phosphors doped with Eu2+ is investigated.lt is found that the long-persistent white phosphor can be acquired when red phosphor and strontium aluminate phosphors are mixed with molar proportion of 100:20. |
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