Abstract
The luminescence properties of Tb3+ and Dy3+ complexes containing newly synthesized pyrazole-5-carboxylic acids have been studied. It was established that lifetimes (τ) of 4F9/2 emission of Dy3+ ion in these complexes changes <3 from 3 to 6 μs, while those 5D4 emission of Tb3+ ion characterizes by τ = 435-910 μs. The principal possibility of Dy3+ detection in the presence Tb3+ by means of time-resolved luminescence was shown for the first time. It was proved by the determination of Dy3+ in luminescent materials doped by both Tb3+ and Dy3+, simultaneously.
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