Optical property and energy transfer in the ZnO-LiYbO<inf>2</inf>hybrid phosphors under the indirect near-UV excitation

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Journal of the Electrochemical Society, 2012, 159 (1)
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The ZnO-LiYbO2hybrid phosphors with various Yb2O3and Li2CO3starting concentrations were prepared by using the solid-state reaction method in a weak reducing atmosphere. Under the excitation of ZnO absorption with near-UV photons, the intense near infrared emission originated from Yb3+:2+F5/2→2F7/2transition can be observed due to the efficient energy transfer from ZnO to Yb3+ions. This efficient energy transfer is benefit from the introduction of Yb3+ions into ZnO lattice at the interfacial diffusion layers between ZnO and LiYbO2crystals. The luminescence decay of Yb3+were recorded under the excitation of ZnO intrinsic absorption at 350 nm and excitonic absorption at 395 nm, in which the rise component can be clearly observed and the simulated rise lifetime that describing the population speed are 0.006 and 0.035 ms, respectively. The obvious different population speed of Yb3+:2F5/2excited level indicates two energy transfer mechanisms from ZnO to Yb3+: the cooperative energy transfer process under the excitation of intrinsic absorption and the phonon-assistant energy transfer process under the excitation of excitonic absorption, respectively. © 2011 The Electrochemical Society.
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