Abstract
1,2,4-benzenetricarboxylic acid (1,2,4-H3btc) as ligands, a series of fluorescent coordination polymers Eu–Tb(btc) were synthesized by co-precipitation method. Researchers could regularly modulate the emitting color of phosphors by adjusting the excitation wavelength as well as the relative concentration of Ln3+ ions to obtain white light. By adjusting the Eu3+/Tb3+ ratios, the controllable green-white-red transition are achieved in the fluorescence color of Eu–Tb(btc) due to the energy transfer from Tb3+ to Eu3+. Furthermore, the white-light-emitting of Eu0.5Tb1(btc)1.5 was optimized by co-doping inert rare earth ions (IREI=La3+, Gd3+, Lu3+). The addition of IREI was found to enhance the characteristic peaks intensity of Eu3+ and Tb3+. Based on analyzing the opposite trends of fluorescence lifetimes of Tb3+ in Eu–Tb(btc) and La-Eu-Tb(btc), a possible mechanism about the energy transfer Tb3+ to Eu3+ in La-Eu-Tb(btc) was offered.
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