Abstract
We describe a unique method for continuously and independently varying the rate-controlling time constant of excited Yb+3 ions in rare-earth up-converting phosphors. We show, in the system BaYb2F8: Er, that at all values of the time constant, the power radiated is directly proportional to the square of the observed radiative lifetime, in accordance with the 2-transfer model of Auzel. The decrease in this time constant arises from the introduction of radiation-produced defects which selectively affect the Yb+3 rather than the activator ions. The phenomenon can be used to study energy transfer from Yb+3 to any activator.
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