Photoluminescence properties of Eu-doped ZnO grown by radio frequency magnetron sputtering technique are
investigated. Under the UV light excitation, Eu3+-related red emissions are observed, which reveals that an energy
transfer exists from the ZnO host to the Eu3+ ions. By carrying out temperature dependent behavior of the time-resolved
photoluminescence, we confirm the lifetime is likely associated with transitions including both temperature insensitive
radiative decay and temperature sensitive non-radiative decay mechanisms. So a rate-equation model is used to analyze
the population dynamics and the transitions between different states and decay constants for the relaxation processes are
obtained. The study suggests that the energy transfer efficiency from the ZnO host to the Eu3+ ions is reduced above 80
K.
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