It was found that Tb^3^+ (Sm^3^+, Dy^3^+, Tm^3^+) could form a ternary ion association compound with BPMPHD and CTMAB. The solid chelate of determined by chemical method and its composition and structure were determined by chemical method and MS, IR, NMR. The ion association system emitted the intrinsic fluorescence of Tb^3^+ (Sm^3^+, Dy^3^+, Tm^3^+) and had co-luminescence effect. Its solvent effect and luminescence mechanism was studied. Experiments showed that the exhancing ion association compound acted as not only the energy donors but also the energy-insulating sheath. The forster theory was introduced into the co-luminescence system for the first time to estimate the critical distance for 50% inter-molecular energy transfer in the Tb-Gd-BPMPHD system, R0=1.67nm, and the maximum distance, γmax=5.48nm, for the co-luminescence effect. It is believed that the inter-molecular energy transfer was carried out in a form of dipole resonance according to value of R0.

Key words: THULIUM, PYRAZOLONE P, SOLVENT EFFECT, DYSPROSIUM, SAMARIUM, TERBIUM, LUMINOUS MECHANISM, HEXANEDIONE P