摘要
本文报导了Eu^(3+),Dy^(3+)在Ba_2RV_3O_(11)(R=Y,Gd,La)基质中的光谱性质、Bi^(3+)对Dy^(3+)发射强度的影响及温度对Dy^(3+)发射强度的猝灭情况.研究了被取代离子R^(3+)(R=Y,Gd,La)对基质电行迁移带、Eu^(3+)的红橙比、Dy^(3+)黄蓝比的影响,还给出了Dy^(3+)的浓度猝灭值.
The luminescence properties of Eu3 + and Dys + , the influence of Bi3 + on the emission intensity of Dy3 + , and the concentration and thermal quenching of Dy3 + in Ba2RV3O: 1(R = Y, Gd, La) are reported in this paper for the first time. The dependences of charge transfer band of V3O117-, the Red-to-Orange intensity ratio (R/O) of Eu3 + and the Yellow-to-Blue intensity ratio (Y/B) of Dy3+ on the rare earth ions R3+ were systematically investigated.Strong absorption band of V3O117- appears in the excitation spectra of Eu3+ or Dy3+, this means that V3O117- can sensitize Eu3+ or Dy3 +(Figures 2 and 3).It is shown from the luminescence spectra of Eu3+ that Eu3+ ions occupy sites with deviation from inverse center in Ba2YV3O11 and Ba2-GdV3O11, because the intensity of 6D0-7F2 transition of Eu3 + is stronger than that of 5D0-7F1 transition in these two mat ixes. However, Eu3+ ions occupy sites without inverse center in Ba2LaV3O11, as the 5D0-7F0 transition of Eu3+ appears in the matrix(Fig.2) The Red-to-Orange intensity ratio(R/O) of Eu3+ and the Yellow-to-Blue intensity ratio (Y/B) of Dy3+ depend on its site symmetry which was determined by Eu3+ as structural probe. In Ba2RV3O11 (R = Y, Gd), Eu3 + or Dy3+ is located at the site with deviation from inverse center. Their R/O or Y/B is larger than that in Ba2LaV3O11 , where Eu3 + or Dy3+ is located at the site without inverse center. R/O of Eu3+ (or Y/B of Dy3 + ) depends also on rare earth ions R3 + which is replaced by Eu3+(or Dy3+).The optimum concentrations of Dy3+ in Ba2YV3O11 ,Ba2GdV3O11 and Ba2LaV3O11 are 2,9 and 6mol%, respectively (Fig. 4).Bi3+ acts as a killer of Dy3 + .The emission intensity of Dy3+ decreases with increasing concentration of Bi3+ (Fig. 5).The emission intensity of Dy3+ in Ba2RVsO11 begins to quench above 100???CCCCCCCCCC. At 350???CCCCCC it decreases to half of its value at room temperature (Fig. 6).
出处
《发光学报》
EI
CAS
CSCD
北大核心
1992年第3期226-233,共8页
Chinese Journal of Luminescence
基金
国家自然科学基金
