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The optical activation of Si nanowires (SiNWs) by the coating of Er 3+ doped binary silicon–aluminum oxides (Si–Al oxides) films derived from sol–gel solutions is reported. Continuous and crack-free Si–Al oxide film could be successfully coated onto an Si substrate where the SiNWs were grown. The strong Er 3+ luminescence of 1.534μm from the SiNWs was observed at a high Er concentration...
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