Abstract
In this work, we report a theoretical and experimental investigation of the energy transfer mechanism in two isotypical 2D coordination polymers, ∞[(Tb1–xEux)(DPA)(HDPA)], where H2DPA is pyridine 2,6-dicarboxylic acid and x = 0.05 or 0.50. Emission spectra of ∞[(Tb0.95Eu0.05)(DPA)(HDPA)] and ∞[(Tb0.5Eu0.5)(DPA)(HDPA)], (1) and (2), show that the high quenching effect on Tb3+ emission caused by Eu3+ ion indicates an efficient Tb3+→Eu3+ energy transfer (ET). The kET of Tb3+→ Eu3+ ET and rise rates (kr) of Eu3+ as a function of temperature for (1) are on the same order of magnitude, indicating that the sensitization of the Eu3+ 5D0 level is highly fed by ET from the 5D4 level of Tb3+ ion. The ηET and R0 values vary in the 67–79% and 7.15 to 7.93 A ranges. Hence, Tb3+ is enabled to transfer efficiently to Eu3+ that can occupy the possible sites at 6.32 and 6.75 A. For (2), the ET processes occur on average with ηET and R0 of 97% and 31 A, respectively. Consequently, Tb3+ ion is enabled to transfer energy to E...
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