Abstract
Excitation of Tb3− in POCl3:SnCl4 (9/1 by volume) at wavelengths shorter than 487 ± 1 nm (7F6→5D4) is accompanied by fluorescence emission from both the 5D3 and 5D4 states of Tb3+. The fluorescence lifetimes of the former emission are shorter, namely τ??? = 0.4 ms at 25°C and 1 × 10−2 M Tb3+ and they exhibit a dependence upon both the concentration of Tb3+ and the temperature. This dependence is attributed to the depletion of the population of the 5D3 state by coupling the transitions 5D3→5D4 and 7F6→7F1 or 7F0 of Tb3+. This self-quenching process is slightly temperature dependent. An activation energy barrier of about 3 kcal/mole has been determined.
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