Acta Phys. -Chim. Sin. ›› 1990, Vol. 6 ›› Issue (05): 580-588.doi: 10.3866/PKU.WHXB19900513

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Coordination Field Analysis of the Fluorescence Spectra of Eu3+ and Tb3+ Doped in LnOX Matrixes

Yang Pin; Li Si-Dian; Wang Yue-Kui   

  1. Institute of Molecular Science, Shanxi University, Taiyuan; Department of Chemistry, Yuncheng Teachers College, Yuncheng
  • Received:1988-12-05 Revised:1990-04-26 Published:1990-10-15
  • Contact: Yang Pin

Abstract: Based on Double Sphere Coordination Point Charge Field (DSCPCF) model, the coordination field perturbation energy levels of Eu~(3+) and Tb~(3+) ions doped in LnOX matrixes (Ln~(3+)= La~(3+), Gd~(3+), Y~(3+); X~- = Cl~-, Br~-, I~-) were calculated and the corresponding spectra at liquid nitrogen and liquid helium temperature were assigned. The result shows that 1) the DSCPCF perturbation energy levels agree well with the spectra observed, 2) the coordination field parameters B_m~k show an increasing trend with the increasing of the ionic radius and the electronegativity of both Ln~(3+) and X~- host ions, 3) the Nephelauxetic effect on RE ions and the orbital overlap between RE ion and its ligands are partly revealed by their characteristic parameters--the effective nuclear charge Z_j~* and the bond charge q_j in DSCPCF model, and 4) by comparison with Point Charge Field (PCF) model, B_m~2 in DSCPCF model decrease slightly, while B_m~4 especially B_m~6 increase greatly. This correction may overcome the shortcoming of PCF model in certain degree.