Luminescence Properties Of Lu₂O₃:Eu³⁺/Pr³⁺ Phosphors Doping With Metal Ions

In this thesis,a series of metallic ions such as Li⁺,Na⁺,K⁺,Ca²⁺,Ba²⁺,Y³⁺,Gd³⁺,Pr³⁺or Eu³⁺-doped Lu₂O₃ scintillation dyes were synthesized by high temperature solid-state reaction.The structure,morphology,excitation spectrum,emission spectrum and energy level life of the synthesized samples were tested by X-ray diffraction,scanning electron microscopy and steady state/transient fluorescence spectroscopy.In the first chapter,the luminescent materials and synthesis methods of scintillator,the characteristics and research status of scintillator based on Lu2O3 are introduced,and the basis and innovation of this thesis are described.The second chapter,the phosphors for Li⁺,Na⁺co-doped Lu₂O₃:Eu³⁺were synthesized by high temperature solid-state reaction.The results show that the emission for sample with 2.5%Li⁺,1%Na⁺and 5%Eu³⁺co-doped Lu₂O₃ is the strongest in the four samples calcined at 800℃in the air for two hours.In the same condition,the luminous intensity of it increased by 1.89 times than that only doped2.5%Na⁺,increased by 3.97 times than that only doped 2.5%Li⁺,and increased by6.43 times than that without doped Li⁺and Na⁺.In the third chapter by the high temperature solid-state reaction of Lu₂O₃:x Pr³⁺and Lu₂O₃:0.1%Pr³⁺,y M phosphors.The results show that the samples after doping metal ions are still pure Lu₂O₃ cubic crystal phase structure.The emission intensities of Lu₂O₃:0.1%Pr³⁺samples doped with 12%Li⁺,8%Na⁺and 8%K⁺increased7.32,4.11 and 2.55 times than that of Lu₂O₃:0.1%Pr³⁺sample,but the emission intensities of samples doped with Ca²⁺and Ba²⁺decreased.Compared with ¹D₂fluorescence lifetime of Lu₂O₃:0.1%Pr³⁺sample,the lifetime of the samples codoped with Li⁺,Na⁺,K⁺,Ca²⁺,Ba²⁺all decreased.In the fourth chapter,Li⁺,Na⁺co doped(Y_xGd_yLu_1-x-y)₂O₃:0.5%Pr³⁺nanopowders were synthesized by high temperature solid-state reaction.The results show that the doping of Li⁺,Na⁺and Pr³⁺does not cause the change of cubic structure of(Y_xGd_yLu_1-x-y)₂O₃ matrix.At 272 nm,the powder samples showed strong Pr³⁺red emission at 632 nm.(Y_0.05Gd_0.05Lu_0.9)₂O₃:0.5%Pr³⁺,2.5%Li⁺,1%Na⁺,and the photocatalytic activity of Y₂O₃ and Gd₂O₃ was 4.8%the strongest,Pr³⁺¹D₂ energy level shorter life.The fifth chapter,Lu₂O₃:0.1%Pr³⁺,0.5%M nanopowders were synthesized by high temperature solid-state reaction.The results show that:the luminescence intensity of Lu₂O₃:0.1%Pr³⁺doped with Ti³⁺,Al³⁺,Zn²⁺,Mg²⁺and Bi³⁺is lower than that of Lu₂O₃:0.1%Pr³⁺.Mg²⁺,Bi³⁺,Ti³⁺co-doped,the lifetime of the sample¹D₂ level is almost unchanged;the lifetime of the ¹D₂ energy level of Zn²⁺and Al³⁺doped samples increase.In Chapter 6th,the article is summarized and prospected.It is expected that the scintillation ceramics with excellent properties,which are based on Lu2O3,can be prepared in the laboratory at the later stage.