Abstract
The aim of this study is to enhance europium ions emission by energy transfer mechanism from terbium to europium ions in codoped ZnO thin films. The samples were annealed with classical and rapid thermal anneal treatments for different temperatures (973K, 1173K and 1373K). Codoped ZnO thin films were characterized for their chemical, structural and photoluminescence properties. Two different terbium concentrations have been studied with roughly constant europium content. Terbium and europium codoping allows an energy transfer from trivalent terbium to europium ions leading to the europium emission hardly observed for ZnO thin films doped by europium only. With thermal annealing above 1173K, diffusion processes occurred with silicon substrate to form zinc silicate and rare earth oxide with a concomitant photoluminescence signal from trivalent europium ions at 615nm (5D0→7F2 transition).
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